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2013

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Articles 301 - 330 of 384

Full-Text Articles in Geotechnical Engineering

Case Histories Of Earthen Dam Failures, R. P. Sharma, Ali Kumar Apr 2013

Case Histories Of Earthen Dam Failures, R. P. Sharma, Ali Kumar

International Conference on Case Histories in Geotechnical Engineering

Historical study of dams conceived in earlier times is essential. To continue advancing, the engineering profession must periodically review past problems and the lessons that they taught. Candid sharing of information on failures as well as successes is needed. In fact, some of the most valuable learning has come from projects where errors have been clear in retrospect. In recent years, dam safety has drawn increasing attention from the public. This is because floods resulting from breaching of dams can lead to devastating disasters with tremendous loss of life and property, especially in densely populated areas. Past dam failure disasters …

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Case Studies Of Dewatering And Foundation Design: Retail Warehouses In Taiwan, Barry S. Chen, Roy E. Jensen Apr 2013

Case Studies Of Dewatering And Foundation Design: Retail Warehouses In Taiwan, Barry S. Chen, Roy E. Jensen

International Conference on Case Histories in Geotechnical Engineering

The case studies in this paper describe three retail warehouse sites in Taiwan that have high groundwater tables in common, but that have drastically different soil conditions. Two of the sites are in dense, permeable gravel and cobble and the third site is in interbedded alluvial sand and clay. At the first site, shallow footings and slab-on-grade floors were placed on top of a permanent passive drainage system that required accurate seepage volume estimates in the permeable gravel and cobble. At the second site, the hydraulic conductivity of the gravel and cobble is high and is sensitive to fluctuation of …

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Constructive Solutions To The Conservation Of Cultural Heritage, Miroslav Todorov Apr 2013

Constructive Solutions To The Conservation Of Cultural Heritage, Miroslav Todorov

International Conference on Case Histories in Geotechnical Engineering

Bulgaria is a country with rich historical heritage and cultural diversity. The protection and conservation of cultural and historical monuments is vital to preserving the national identity of Bulgarians, the relationship with the land and traditional culture as an essential part of his life and means of survival. It should be noted Bulgarian modest contribution to the preservation of 7 (according to UNESCO) cultural monuments and two nature reserves listed as World Heritage. In the center of the Bulgarian capital - Sofia are located over 1400 cultural and historical monuments that highlight the civilizational and cultural outlook of the capital …

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Embankment Construction Using Column Supported Embankment, Aravinda Ramakrishna, Elizabeth Trimpin, Raymond Mankbadi Apr 2013

Embankment Construction Using Column Supported Embankment, Aravinda Ramakrishna, Elizabeth Trimpin, Raymond Mankbadi

International Conference on Case Histories in Geotechnical Engineering

The construction of roadway embankments over soft, compressible soils challenges designers with managing large and differential settlements, maintaining embankment stability, and minimizing construction costs associated with long consolidation periods. These challenges can be successfully tackled with the use of an in-situ soil improvement technique such as the Column Supported Embankment (CSE). The Column Supported Embankment involves constructing a pattern of cement-grouted columns in-situ, using the vibro-displacement or displacement-auger technique. The columns are constructed to bear on dense sand strata underlying cohesive strata that would otherwise consolidate under the embankment loading. A load transfer platform (LTP) is used to effectively distribute …

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Failure Investigation And Restoration Of Two Cellular Sheetpile Structures, Frank M. Clemente Apr 2013

Failure Investigation And Restoration Of Two Cellular Sheetpile Structures, Frank M. Clemente

International Conference on Case Histories in Geotechnical Engineering

The Trainer - Delco Tap - Mickleton 220-38 kilo-volt transmission lines are carried across the Delaware River by two 332-foot high steel latticed towers each founded on a man-made foundation island structure. Each island structure is comprised of four interconnected cellular sheetpile structures. One island, suffered a severe partial failure due to long-term scour in the Delaware River, near Chester, Pennsylvania. The other island exhibited early symptoms of potential failure, also due to scour. The client was the Philadelphia Electric Company, now known as PECO, acting on behalf of the owner, the Atlantic Electric Company (AECO). The author served as …

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Lessons From Revisiting Three Cases Of Slope Failure, Konstantina Papadopoulou, George Gazetas Apr 2013

Lessons From Revisiting Three Cases Of Slope Failure, Konstantina Papadopoulou, George Gazetas

International Conference on Case Histories in Geotechnical Engineering

Three old failures of geotechnical projects are analyzed, where some original design uncertainties were lately discovered. The first case concerns the failure during construction of a slope at the portal area of a tunnel in Greece, due to unexpected excessive water pressures. The failure was restricted to the upper weathered zone of flysh formation. Due to difficulties in performing laboratory tests with such hard soil material necessitated the estimation of shear strength parameters on the basis of the rockmass classification systems. The next case deals with an extensive failure of an open pit mine slope in Greece. The ground consists …

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Numerical Analyses Of Soil Deformations Around Deep Excavations, Oktay Sevencan, Kutay Ozaydin, Havvanur Kilic Apr 2013

Numerical Analyses Of Soil Deformations Around Deep Excavations, Oktay Sevencan, Kutay Ozaydin, Havvanur Kilic

International Conference on Case Histories in Geotechnical Engineering

In this study, the deep excavation of Cincin Station located along the Bağcılar - Otogar metro line which is currently under construction in Istanbul is modeled numerically. The excavation (depth 32.5 m) of the station is carried out with a surrounding slurry trench diaphragm wall and top-down construction method. The six slabs of the station building and the foundation mat are used as support elements. Lateral soil displacements are measured with inclinometers placed in the wall and nearby soil layers. The results of numerical analysis using soil profile and geotechnical parameters obtained from conventional field and laboratory tests and measured …

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Review Of The Seismic Retrofitting Of Sardis Dam, Randa Asmar, Abdul Qudoos Khan Apr 2013

Review Of The Seismic Retrofitting Of Sardis Dam, Randa Asmar, Abdul Qudoos Khan

International Conference on Case Histories in Geotechnical Engineering

Most of the dams in Central United States, built in earlier part of 20th century are hydraulic fill dams. At the time of construction of these dams, earthquake engineering was still in its infancy and hence the dams lacked proper seismic design. Failure or near failure of earth dams as a consequence of earthquakes forced the United States Army Corps of Engineers (USACE) to re-evaluate the seismic performance of major earth dams in the Central United States, one of these dams was Sardis Dam. Investigations of Sardis Dam revealed a potentially liquefiable silty clay layer under the upstream shell. It …

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Stabilization Of A Failed Highway Slope: A Multi-Phased Approach, Jeffrey T. Anagnostou, Anthony S. Nestor, Purushottam Deo, Heidi Flateau Apr 2013

Stabilization Of A Failed Highway Slope: A Multi-Phased Approach, Jeffrey T. Anagnostou, Anthony S. Nestor, Purushottam Deo, Heidi Flateau

International Conference on Case Histories in Geotechnical Engineering

A county road department in Southeastern Michigan was faced with the problem of stabilizing a slope along the Clinton River supporting a heavily trafficked roadway. The roadway and supporting slope had performed satisfactorily for over 50 years. However, a reinforced concrete seawall that had partially supported the slope deteriorated over time, contributing to progressive failure of the slope and resulting damage to the roadway. The site is situated within the glacial lake plain district of Southeastern Michigan. The site geology consists of approximately 7 feet of over-consolidated clays underlain by approximately 17 feet of normally consolidated glacial-lacustrine clays. Below the …

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Underpinning A Residential Structure On Uncontrolled Fill With Helical Screw-Piles, Alan J. Lutenegger Apr 2013

Underpinning A Residential Structure On Uncontrolled Fill With Helical Screw-Piles, Alan J. Lutenegger

International Conference on Case Histories in Geotechnical Engineering

Underpinning of a private residence using square-shaft helical Screw-Piles is described. A two story wood frame single-family residence constructed in 1996 in a small subdivision started to experience differential settlement not long after construction. The settlement continued for several years, leading to excessive cracking in the basement walls and floor, severe misalignment of doors and windows and cracking of interior walls. It was discovered that the area of the housing development had previously been used as a commercial sand and gravel pit which had subsequently been used as a local dumping area for miscellaneous refuse and which had then been …

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Failures And Remediation Of Rock Slope Stability Problems And Remediation At Earthquakes At Part Of Werka Descent Road West Of Saudi Arabia, Bahaaeldin Sadagah Apr 2013

Failures And Remediation Of Rock Slope Stability Problems And Remediation At Earthquakes At Part Of Werka Descent Road West Of Saudi Arabia, Bahaaeldin Sadagah

International Conference on Case Histories in Geotechnical Engineering

Werka descent road lies at western region of Saudi Arabia. It is constructed two years ago harmed due to rainstorm and absence of remedial measures. Werka mountainous road subjected to failures of man-made rock slope faces, and debris flow along both sides of 8-m width road. Intensive geotechnical study includes the RMR and GSI rock masses classifications were applied indicates that the rocks are medium to poor quality. The integrated techniques such as graphical method, modeling, and simulation were utilized to assess rock slope failures and rockfalls by using DIPS, RocFall, RocPlane and Swedge programs, and recommend the remedial measures …

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Backward Erosion Piping Model Verification Using Cases In China And The Netherlands, V. M. Van Beek, Q. L. Yao, M. A. Van Apr 2013

Backward Erosion Piping Model Verification Using Cases In China And The Netherlands, V. M. Van Beek, Q. L. Yao, M. A. Van

International Conference on Case Histories in Geotechnical Engineering

Backward erosion piping, the process of shallow pipe development in the sandy foundation of levees, is a threat to the safety of levees in countries like China and the Netherlands. Several models are available to predict the required critical head for this phenomenon, i.e. Bligh’s model and Sellmeijer’s model. Well-documented breach cases, which unfortunately are rare, give the opportunity to verify the applicability of prediction models. In this paper two piping cases in China and one piping case in the Netherlands have been described and analyzed in order to compare the outcome of prediction models with this actual data. It …

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Investigation Of The Effect Of Modeling Of Control Tunnel In Retaining Structure Of J2 Station Of Mashhad Metro Using Plaxis 2d, S. M. Mousavi, F. Rouzmehr, A. H. Fazli Apr 2013

Investigation Of The Effect Of Modeling Of Control Tunnel In Retaining Structure Of J2 Station Of Mashhad Metro Using Plaxis 2d, S. M. Mousavi, F. Rouzmehr, A. H. Fazli

International Conference on Case Histories in Geotechnical Engineering

Nowadays using of underground concrete arch excavation method is very common for execution of retaining structures (soldier structure) of deep and semi deep metro stations all around the world. In this method executer can use retaining structure as a part of main structure of station in next construction steps with using of piles of retaining structure as a part of main structure's wall. One of the first steps in building retaining structure of metro station is control tunnel (patrol tunnel) that usually is a prefabricated controlling tunnel in the middle of retaining structure. This tunnel is used for digging bores …

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Stability Analysis Of Behesht-Abad Water Conveyance Tunnel Inlet Portal Using Experimental, Limit Equilibrium And Numerical Methods, Arash Mohammadi, Mahmoud Hashemi, Hooman Sharifpour Apr 2013

Stability Analysis Of Behesht-Abad Water Conveyance Tunnel Inlet Portal Using Experimental, Limit Equilibrium And Numerical Methods, Arash Mohammadi, Mahmoud Hashemi, Hooman Sharifpour

International Conference on Case Histories in Geotechnical Engineering

The Behesht-abad Water Conveyance Tunnel is one of the most important tunnels conveying water to central Iran plain having 60 km length and 6 m diameter. The tunnel portal intersects with important faults of the region which is nearby Ardal city. Therefore, the rock mass surrounding the tunnel portal faces instability problem. Initially, the joints characteristics of the rock mass surrounding the inlet portal were evaluated to find the dominant joint sets along with the characteristics required for stability analyses inputs. Also the deformation modulus and other engineering properties of the rock mass were assessed using the available drilled boreholes …

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Landslide Stabilization Along The Ohio River Using Cantilevered Stub Piers, Swaminathan Srinivasan, Jess A. Schroeder Apr 2013

Landslide Stabilization Along The Ohio River Using Cantilevered Stub Piers, Swaminathan Srinivasan, Jess A. Schroeder

International Conference on Case Histories in Geotechnical Engineering

Landslide activity along U.S. 50 in Cincinnati, Ohio has caused roadway damage for decades. After a necessary closure of 3 lanes due to slope movements, emergency stabilization measures were undertaken to protect the roadway by providing a “pseudo” short-term solution (target 3 to 5 years) necessitated by ODOT budget constraints. The landslide shear plane was near the top of a sloping bedrock surface as much as 50 feet below grade. “Stub Piers” were installed 40 feet downslope of the roadway shoulder. The shafts were heavily reinforced across the deep shear plane but steel reinforcing did not extend the full length …

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M-222 Slope Stabilization Case History – Geotechnical Lessons Learned From Michigan Department Of Transportation Design Build Project, Michael J. Thelen, Daniel A. Thome Apr 2013

M-222 Slope Stabilization Case History – Geotechnical Lessons Learned From Michigan Department Of Transportation Design Build Project, Michael J. Thelen, Daniel A. Thome

International Conference on Case Histories in Geotechnical Engineering

In 2009, the Michigan Department of Transportation (MDOT) became concerned about ongoing slope movements adjacent to a segment of M-222 located on outside bend of the Kalamazoo River in the City of Allegan, Michigan. Over the next couple years, continued river erosion and seasonally wet springs caused 8- to 10-foot high scarps adjacent to M-222, condemnation of a home, and several large block slides into the river. In the early spring of 2011, MDOT secured their first Construction Manager/General Contractor (CMGC) delivery method contract to protect M-222 and repair the slope. Improvements included constructing an up to 26-foot tall retaining …

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Field Testing Of Crushed Ignimbrite For Seismic Retrofit Of Matahina Dam, Lelio H. Mejia Apr 2013

Field Testing Of Crushed Ignimbrite For Seismic Retrofit Of Matahina Dam, Lelio H. Mejia

International Conference on Case Histories in Geotechnical Engineering

The performance of zoned embankment dams depends on the ability of filter and drain zones to prevent seepage erosion and piping of impervious materials, while providing adequate internal drainage. Because cracking of filter and drain zones might compromise their function, special care is typically exercised to build such zones of cohesionless materials that are unable to support cracks. Limited information is available on the cracking susceptibility of filter and drain materials manufactured by rock crushing. This paper presents a case history of field and laboratory testing of a crushed ignimbrite rock to evaluate its suitability as filter and drain material …

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Over Eight Decades Old “Young” Landslide – A Case Study, Kishor Kumar, P. S. Prasad, Anil Kathait, Indervir Singh Apr 2013

Over Eight Decades Old “Young” Landslide – A Case Study, Kishor Kumar, P. S. Prasad, Anil Kathait, Indervir Singh

International Conference on Case Histories in Geotechnical Engineering

Shirobagad also named as Kaliasaur Landslide was developed in the year 1920 at kilometer-147 on National Highway – 58 (earlier named as State Highway - 45) at latitude 300 14’ 30” N and longitude780 53’ 57” in Garhwal region of western Himalaya. This landslide has been investigated by a number of organizations in India and a wealth of data has been generated mainly on geological aspects. Central Road Research Institute has also investigated this landslide during 2007-2011 covering geological as well as geotechnical aspects. The study area basically encompasses metavolcanis and variants of quartzite rock (e.g. pink and white quartzite) …

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Self Hardening Slurry Wall Installation By Hydromill At The Herbert Hoover Dike – An Innovative Solution, Mario Mauro, Carlos Morales, Jeff Taylor Apr 2013

Self Hardening Slurry Wall Installation By Hydromill At The Herbert Hoover Dike – An Innovative Solution, Mario Mauro, Carlos Morales, Jeff Taylor

International Conference on Case Histories in Geotechnical Engineering

In 2007 the US Army Corps of Engineers classified the Herbert Hoover Dike in Florida as a DSAC 1 dam, and started the implementation of one of the largest dam rehabilitation projects in the nation. The construction of the cutoff wall is a key feature of this rehabilitation work to upgrade the dike to current dam safety criteria. The cutoff wall installation is currently being completed on Reach 1, which extends from Port Mayaca to Belle Glade, under a Multiple Task Order Contract based on performance specifications and stringent verification criteria. For the construction of the cutoff wall TREVIICOS selected …

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Stability Analysis Of The Serchio River Flood Plain Embankments (Tuscany, Italy), Nunziante Squeglia, Barbara Cosanti, Diego C. F. Lo Presti Apr 2013

Stability Analysis Of The Serchio River Flood Plain Embankments (Tuscany, Italy), Nunziante Squeglia, Barbara Cosanti, Diego C. F. Lo Presti

International Conference on Case Histories in Geotechnical Engineering

Following the geotechnical characterization of 30 km long flood - plain embankments of the Serchio River (Tuscany – Italy), a number of numerical analyses have been carried out. The embankments have been constructed since the XVIII century and have experienced several failures in the years (the last in December 2009). The geotechnical characterization of the river embankments and the 2009 flood are described in a companion paper in this Conference. This paper shows the results of numerical analyses that have been carried out for various purposes. More specifically, the numerical analyses were carried out a) to clarify the causes of …

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Ground Motion Amplification From Vertical Propagation Of Earthquake Waves, Nien-Yin Chang, Roger L. Torres Apr 2013

Ground Motion Amplification From Vertical Propagation Of Earthquake Waves, Nien-Yin Chang, Roger L. Torres

International Conference on Case Histories in Geotechnical Engineering

The paper is directed to follow a procedure where seismic responses are identified and recommendations to proceed with their applications are made quickly and economically, before engaging in a complex analysis. It is not intended for selecting design soil parameters or earthquake parameters for the final design of any specific dam. A selected earthquake accelerogram will produce response accelerations and strains that will cover a significant variety of accelerograms in terms of severity of earthquake damage to an earth dam. Scaling-up and scaling-down the selected outcrop motion broadens the spectrum of seismic response analyses using simple and effective SHAKE program …

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Lateral Movements Of A Bridge Abutment Due To Compressible Foundation Soils, Alper Turan, Tony Sangiuliano, M. Shahria Alam, M. Hesham El Naggar Apr 2013

Lateral Movements Of A Bridge Abutment Due To Compressible Foundation Soils, Alper Turan, Tony Sangiuliano, M. Shahria Alam, M. Hesham El Naggar

International Conference on Case Histories in Geotechnical Engineering

Highway approach embankments are often constructed over weak and compressible soils. The consolidation settlements induced by the embankment loads are known to result in downdrag forces and lateral forces on the piles supporting the bridge abutments. Several approaches are commonly employed during construction of highway bridges in Ontario in order to reduce these forces. These approaches include: preloading and surcharging to achieve the anticipated settlements prior to the installation of abutment piles; application of lightweight fill materials such as expanded polystyrene and expanded pelletized blast furnace to reduce embankment loads; and measures to expedite pore water pressure dissipation such as …

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The Consolidation Behavior Of The Clay-Core In A Rock Fill Dam — Atatürk Dam Case Study, Atila Sezen, M. Atilla Ansal Apr 2013

The Consolidation Behavior Of The Clay-Core In A Rock Fill Dam — Atatürk Dam Case Study, Atila Sezen, M. Atilla Ansal

International Conference on Case Histories in Geotechnical Engineering

Unexpectedly large settlements occurred in the 165 meter high clay core of Atatürk Dam during the reservoir filling stage. An investigation was conducted based on laboratory experiments and numerical analysis. Consolidation tests were performed on compacted samples under stress levels expected to take place in the field by considering the possible factors affecting the consolidation behavior. The experimental findings were used to model the observed settlements based on a parametric study and by back-calculation. The total expected settlements were determined to be in the order of 16.0 m. While a good fit was captured between the observed and modeled settlements …

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Influence Of Dam And Foundation Discountinuities Using Discountinuum Approach — A Case Study, Shilpa Pal, Dilip K. Paul Apr 2013

Influence Of Dam And Foundation Discountinuities Using Discountinuum Approach — A Case Study, Shilpa Pal, Dilip K. Paul

International Conference on Case Histories in Geotechnical Engineering

Dam-foundation interaction plays an important role in the design and analysis of concrete gravity dams as has been reviewed from the failures of dams in the literature. The objective of the study is to understand the behavior of a concrete gravity dam taking into account the effect of dam and foundation discontinuities using three-dimensional Distinct Element Code. Different models have been formulated considering the complexities involved in the modeling of the dam structure, dam-foundation system and the results have been compared. Modeling the dam with the discontinuity in the form of crack which runs through the concrete section has a …

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A 2-Dimentional Approach For Numerical Modeling Of Seismic Gravel Drains In Liquefiable Grounds, Mahmood Seid-Karbasi, Roberto Olivera, Upul Atukorala Apr 2013

A 2-Dimentional Approach For Numerical Modeling Of Seismic Gravel Drains In Liquefiable Grounds, Mahmood Seid-Karbasi, Roberto Olivera, Upul Atukorala

International Conference on Case Histories in Geotechnical Engineering

Liquefaction of water saturated granular soils is one of the major risks thai affect the safety and earthquake pcrfonnancc of infraSlmC\urc such as bridges, dams, ports, and lifelines in various parts of Ihe world. The seismically-induced ground deformations arc often Ihe main concern when liquCr:1cl ion occurs in significant zones of an earth Sinlcturc or soil foundat ion. Recent studies ineluding field data, centrifuge model testing and numerical investigations suggest that one of the promising measures 10 alleviate large earthqu.ake-induced deformat ions and ground failures is by installing stone columns and/or gravel drains. Design of such treatment scheme needs to …

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Bank Instability Problems Associated With The Riverside Construction, Gennaro G. Marino, Abdolreza Osouli Apr 2013

Bank Instability Problems Associated With The Riverside Construction, Gennaro G. Marino, Abdolreza Osouli

International Conference on Case Histories in Geotechnical Engineering

In this case study, the sliding of a riverbank during construction of a water intake facility in Tennessee was investigated and analyzed. The construction of the project involved the installation of 2-36 in. diameter intake pipes from the wet well to the river inlet which were 290 ft apart. An open cut excavation from the river inlet to the riverbank toe was used to connect the inlet to the tunnel-installedintake pipes on the land side. During the excavation, a 25 ft wide slide, which 4 months later widened by another 15 ft, developed to the crest of the road on …

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Ground Deformations Observed After 23.10.2011 MW 7.2 Van Earthquake (Turkey), Mutluhan Akin, Ali Ozvan, Muge K. Akin, Tamer Topal Apr 2013

Ground Deformations Observed After 23.10.2011 MW 7.2 Van Earthquake (Turkey), Mutluhan Akin, Ali Ozvan, Muge K. Akin, Tamer Topal

International Conference on Case Histories in Geotechnical Engineering

A destructive earthquake with a moment magnitude of 7.2 occurred in the north of the Van province (Turkey) on 23rd October 2011 at 13:41 local time and caused approximately 600 deaths and more than 4000 injuries. Many damaging aftershocks were recorded for more than a month after the main shock including a triggered earthquake (Mw 5.6) located in the southern district of Van, namely Edremit, on November 9th, 2011 which caused additional damage and casualties. After the Mw 7.2 Van earthquake, earthquake-induced ground deformations such as liquefaction and lateral spreading were extensively observed around the shores of Lake …

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Liquefaction Of Mine Tailings, Vijay K. Puri, Todd R. Kostecki Apr 2013

Liquefaction Of Mine Tailings, Vijay K. Puri, Todd R. Kostecki

International Conference on Case Histories in Geotechnical Engineering

Liquefaction of mine tailings is known to occur during cyclic, quasi-static & static loading cases but is still a relatively misunderstood concept because tailings dam failures continue to occur. In the worst case scenario the results are high costs, hindered public perception, environmental cleanup and worst of all, the loss of life. A better understanding of this issue is essential for any engineer associated with the mining and/or geotechnical industry, and in particular tailings dam construction and maintenance. This paper presents the liquefaction concept, some case histories dealing with failure of mine tailings dams, available testing methods and some dated …

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Spectral Attenuation Characteristics Of Strong Ground Motions In East-Central Iran Using Theoretical Data, Majid Mahood, Hossein Hamzehloo Apr 2013

Spectral Attenuation Characteristics Of Strong Ground Motions In East-Central Iran Using Theoretical Data, Majid Mahood, Hossein Hamzehloo

International Conference on Case Histories in Geotechnical Engineering

Ground-motion prediction equations are an essential element of PSHA. In seismic hazard analysis, attenuation calculations determine how quickly ground motions decrease as the distance from a seismic event increases. The estimation of ground motion for future earthquakes as a function of magnitude and distance is an important problem from earthquake engineering point of view. This article presents spectral equations for the estimation of horizontal strong ground motions caused by shallow crustal earthquakes with magnitude range of Mw 5.0 to 7.4 and distance to the surface projection of the fault less than 100 km for theoretical (simulated) records. The reason …

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Modified Value Of Rock Quality Designation Index Rqd In Rock Formation, Ahmed T. M. Farid Apr 2013

Modified Value Of Rock Quality Designation Index Rqd In Rock Formation, Ahmed T. M. Farid

International Conference on Case Histories in Geotechnical Engineering

The rock quality designation, RQD, is a commonly index used in the description of rock mass quality. This RQD, index value is used to predict the engineering properties of the rock strata under study. The RQD index value was introduced for the engineering applications, such as mining and geotechnical engineering. Calculating of RQD index for rock formation is a great part due to its simplicity. However, this also leads to a number of limitations, including among other, a dependency of RQDm value on the borehole orientation and on the selected threshold value for the minimum intact core length. In this …

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