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Articles 1 - 30 of 47
Full-Text Articles in Engineering
Laboratory Evaluation Of The Geotechnical Properties Of Biochar-Amended Clay, Brett Natelborg
Laboratory Evaluation Of The Geotechnical Properties Of Biochar-Amended Clay, Brett Natelborg
Senior Honors Theses
The upkeep and rehabilitation of infrastructure damage related to the shrinking and swelling of expansive soils have cost the United States billions of dollars. Biochar, an innovative and eco-friendly additive proven to improve soil permeability, nutrient retention, and mechanical properties, is investigated as an additive to Mississippi chalk. The index properties of the chalk were determined and used to characterize its nature. The geotechnical engineering properties of the chalk amended with 6% and 12% biochar were evaluated via the Proctor compaction, compression, and direct shear tests. Results were analyzed to make comparative remarks on how the behavior of the chalk …
Development Of A New Electro-Osmotic Consolidation Apparatus, Yenni Mariana Ramírez-Mazo, Juan Pablo Osorio, Sergio Agudelo
Development Of A New Electro-Osmotic Consolidation Apparatus, Yenni Mariana Ramírez-Mazo, Juan Pablo Osorio, Sergio Agudelo
Conference papers
Electro-osmotic consolidation is a ground improvement technique in which a DC voltage is applied to the soil via electrodes, in order to drain the water contained in the pores increasing the effective stress, and thus improving the geotechnical properties of the soil. The technique increases the shear strength, reduces the compressibility, and changes the chemical composition of the saturated soft clayey and silty soils to which it can be applied. Electro-osmotic consolidation has been successfully applied in different projects worldwide. This paper presents the development of a new electro-osmotic consolidation apparatus built at Universidad de Antioquia. Tests were carried on …
Soil Improvement By Electro-Osmotic Consolidation: Laboratory Testing, Yenni Mariana Ramírez-Mazo, Juan Pablo Osorio, Sergio C. Agudelo-Flórez
Soil Improvement By Electro-Osmotic Consolidation: Laboratory Testing, Yenni Mariana Ramírez-Mazo, Juan Pablo Osorio, Sergio C. Agudelo-Flórez
Conference papers
Electro-osmotic consolidation is a ground improvement technique that has been successfully implemented on the field and at laboratory scale since the 30s. However, its application has been done primarily through empirical procedures and experience. The determinant variables in the effectiveness and efficiency of the improvement are numerous and require further studies. This paper presents the evaluation of the improvement process of an inorganic low plasticity clay subjected to a 150 V/m voltage during 5780 minutes. The special analysis of the strains showed differential settlements, as well as cracking at the surface and with depth. The consolidations curves obtained follow the …
Prediction Of Nonlinear Vertical Settlement Of A Pile Group Consisting Of New And Existing Displacement Piles In Clay Strata, Lin Li, Weibing Gong
Prediction Of Nonlinear Vertical Settlement Of A Pile Group Consisting Of New And Existing Displacement Piles In Clay Strata, Lin Li, Weibing Gong
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Reusing existing displacement piles is economical, timesaving, and environment friendly. This paper presents an analytical approach for predicting the load carrying behavior of pile groups consisting of new and existing displacement piles. The evolutions of the undrained shear strength and shear modulus of clay adjacent to the piles from installation through consolidation to long-term ageing are investigated to determine the load carrying behavior of displacement piles. The nonlinear load-settlement behavior of an individual pile is modelled by load-transfer method, where the exponential function-based load-transfer models integrating the two developed soil parameters are employed to represent the nonlinear behavior at the …
Teaching Consolidation: Case Study Of Preloading With Vertical Drains, Robb Moss, Judd King, Gregg Fiegel
Teaching Consolidation: Case Study Of Preloading With Vertical Drains, Robb Moss, Judd King, Gregg Fiegel
Civil and Environmental Engineering
This paper describes a ground improvement case study where preloading and prefabricated vertical drains (PVDs) were used to accelerate foundation settlements. The case study is used in a classroom setting with the learning objective of introducing engineering students to methods for estimating settlement of shallow foundations on compressible soils. The project site was developed for a corporate retail chain planning to open a new facility in San Luis Obispo, California. Up to 2.5 meters of fill were needed across much of the site to raise foundations and improvements above the flood elevation. Loads from the fill and the structure were …
Consolidation Behavior Of Bulk Amorphous Glasses And Foils: The Effect Of Current On Devitrification Kinetics, Olivia Graeve, James Kelly, Boyao Zhang
Consolidation Behavior Of Bulk Amorphous Glasses And Foils: The Effect Of Current On Devitrification Kinetics, Olivia Graeve, James Kelly, Boyao Zhang
Electric Field Assisted Sintering and Related Phenomena Far From Equilibrium
We present the application of dynamic loading and rapid heating as controlling parameters for the spark plasma sintering of an ultra-high hardness and highly corrosion resistant Fe-based amorphous alloy (Fe49.7Cr17.7Mn1.9W1.6B15.2C3.8Si2.4), such that sintering temperature and time can be used as independent variables for devitrification. We develop two types of in situ composites using the dynamic loading strategy and characterize the density, phase development, and microstructure. We also develop and characterize ex situ composites by adding various crystalline powders to the amorphous metal powders and explore possible …
An Analytical Evaluation Of Radial Consolidation With Respect To Drain Degradation, Thanh Trung Nguyen, Buddhima Indraratna, Cholachat Rujikiatkamjorn
An Analytical Evaluation Of Radial Consolidation With Respect To Drain Degradation, Thanh Trung Nguyen, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Faculty of Engineering and Information Sciences - Papers: Part B
No abstract provided.
Commercial Driver’S License (Cdl) Workflow Study, Steven Andrew Martin, Candice Y. Wallace, Valerie J. Keathley, Jennifer R. Walton
Commercial Driver’S License (Cdl) Workflow Study, Steven Andrew Martin, Candice Y. Wallace, Valerie J. Keathley, Jennifer R. Walton
Kentucky Transportation Center Research Report
Kentucky uses federally funded, time-limited (FFTL) employees to handle some of the administrative work necessary to meet federal compliance standards for commercial driver’s licenses (CDLs). The Federal Motor Carrier Safety Administration (FMCSA) has decided not to continue funding FFTLs for these purposes, meaning that states will have to find other ways to meet CDL program requirements and maintain compliance. Given the potential ramifications of losing federal transportation and enforcement funding due to lack of compliance with federal standards, it is imperative that state lawmakers act to ensure KYTC has the resources to carry out its mandated functions. The study delineates …
Methods Of Vacuum Consolidation And Their Deformation Analyses, Jin-Chun Chai, John Philip Carter, M D. Liu
Methods Of Vacuum Consolidation And Their Deformation Analyses, Jin-Chun Chai, John Philip Carter, M D. Liu
Faculty of Engineering and Information Sciences - Papers: Part A
Two methods, namely the air-tight sheet method and the vacuum-drain method (sheetless), are generally used to conduct vacuum consolidation in the field. The advantages and disadvantages of both methods and the techniques for preventing vacuum leakage through a middle sand layer in a deposit, as well as the method for maintaining vacuum pressure when large settlement occurs, have been described. Vacuum pressure is an isotropic consolidation pressure applied to a soil deposit, and the deformation induced is different from that induced by a surcharge (e.g. the weight of an embankment). Two typical case histories in Japan are presented and deformation …
Performance And Prediction Of Marine Clay Treated With Vacuum And Surcharge Consolidation At Port Of Brisbane, Buddhima Indraratna, A S. Balasubramaniam, Harry Poulos, Cholachat Rujikiatkamjorn, Jayantha Ameratunga
Performance And Prediction Of Marine Clay Treated With Vacuum And Surcharge Consolidation At Port Of Brisbane, Buddhima Indraratna, A S. Balasubramaniam, Harry Poulos, Cholachat Rujikiatkamjorn, Jayantha Ameratunga
Faculty of Engineering and Information Sciences - Papers: Part A
During the past decade, the application of vacuum preloading for stabilising soft coastal clay and other low-lying estuarine soils has become popular in Australia. The cost-effectiveness isa major factor in most projects in view of the significantly reduced time for achieving high degree of consolidation. Due to an increase in trade activities at the Port of Brisbane, new facilities on Fisherman Islands at the mouth of the Brisbane River will be constructed on the new outer area (235 ha) adjacent to the existing port facilities via land reclamation. A vacuum assited surcharge load and conventional surcharge scheme in conjunction with …
Radial Consolidation Model Incorporating The Effects Of Vacuum Preloading And Non-Darcian Flow, Kourosh Kianfar, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Radial Consolidation Model Incorporating The Effects Of Vacuum Preloading And Non-Darcian Flow, Kourosh Kianfar, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Faculty of Engineering and Information Sciences - Papers: Part A
A modified 150 mm Rowe cell equipped with pore water pressure measurement was used to capture the flow relationship during vacuum-assisted radial consolidation. Based on the measured data, a radial consolidation model incorporating the effects of vacuum preloading is proposed, based on a non-linear relationship between the flow velocity and hydraulic gradient. The predictions of the proposed consolidation model are then compared with the predictions based on Hansbo’s Darcian and non- Darcian models. The agreement between the proposed model and the measured data is shown, and the advantages of the proposed model compared with the existing models are discussed. An …
Motor Carrier Tax Consolidation Study, Andrew Martin, Mark Bell, Jennifer Walton
Motor Carrier Tax Consolidation Study, Andrew Martin, Mark Bell, Jennifer Walton
Kentucky Transportation Center Research Report
This study analyzed the tax and fee structure for Kentucky motor carriers and details a possible policy scenario for eliminating the weight-distance tax. The report starts out analyzing detailed revenue and rate information for the motor fuel tax, motor fuel surtax, weight distance tax, IRP registration fees, and intrastate registration fees. Consolidation policies in Idaho and Ohio were reviewed, as well as a previous consolidation proposal in Kentucky. A new consolidation framework was developed, where IRP and intrastate plate fees were increased by 129 percent and the weight-distance tax was eliminated. Projections for weight-distance tax and IRP fees (both current …
Numerical Prediction Of Unsaturated Ground Behavior Influenced By Vegetation And Vacuum Consolidation, Cholachat Rujikiatkamjorn, Buddhima Indraratna, B Fatahi
Numerical Prediction Of Unsaturated Ground Behavior Influenced By Vegetation And Vacuum Consolidation, Cholachat Rujikiatkamjorn, Buddhima Indraratna, B Fatahi
Faculty of Engineering - Papers (Archive)
Bioengineering including native vegetation is an ancient method of improving the stability of slopes. In modern railway engineering, this technique is re-captured for increasing the soil stiffness and shear strength of subgrade beneath rail tracks. Currently this practice has become increasingly popular in Australia for stabilising railway corridors built over expansive clays and compressive soft soils. This paper looks at the stabilisation role by suction generated by both the natural vegetation and the artificial vacuum application using the numerical analysis. For demonstrating the role of native vegetation, a mathematical model for the rate of root water uptake was incorporated in …
Performance And Prediction Of Surcharge And Vacuum Consolidation Via Prefabricated Vertical Drains With Special Reference To Highways, Railways And Ports, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Xueyu Geng
Performance And Prediction Of Surcharge And Vacuum Consolidation Via Prefabricated Vertical Drains With Special Reference To Highways, Railways And Ports, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Xueyu Geng
Faculty of Engineering - Papers (Archive)
Much of the world’s essential infrastructure is built along congested coastal belts that are composed of highly compressible and weak soils up to significant depths. Soft alluvial and marine clay deposits have very low bearing capacity and excessive settlement characteristics, with obvious design and maintenance implications on tall structures and large commercial buildings, as well as port and transport infrastructure. Stabilising these soft soils before commencing construction is essential for both long term and short term stability. A system of vertical drains combined with vacuum pressure and surcharge preloading has become an attractive ground improvement alternative in terms of both …
Finite Element Analysis Of Consolidation Behavior Of Composite Soft Ground, S Horpibulsuk, A Chinkulkijniwat, A Cholaphatsron, J Suebsuk, M D. Liu
Finite Element Analysis Of Consolidation Behavior Of Composite Soft Ground, S Horpibulsuk, A Chinkulkijniwat, A Cholaphatsron, J Suebsuk, M D. Liu
Faculty of Engineering and Information Sciences - Papers: Part A
Columnar inclusion is one of the effective and widely used methods for improving engineering properties of soft clay ground. This paper investigates the consolidation behavior of composite soft clay ground using both physical model tests under an axial-symmetry condition and finite element simulations using the PLAXIS 2D program. Because the soil-cement column enhances the yield stress and stiffness of the composite ground, the composite ground is in an over-consolidated state under the applied vertical applied stresses. At this state, the rate of consolidation is rapid due to a high coefficient of consolidation. The consolidation of the composite ground is mainly …
Vertical Drains, Vacuum Consolidation & Preloading, Buddhima Indraratna
Vertical Drains, Vacuum Consolidation & Preloading, Buddhima Indraratna
Faculty of Engineering - Papers (Archive)
Due to the rapid increase in population, and the subsequent industrial and construction boom, especially in the urban and coastal regions, many countries have intensified the inevitable need for developing infrastructure on problematic soils, including soft compressible clays and deposits with low bearing capacities. Moreover, good quality geological materials for construction are also becoming scarce, a problem exacerbated by the numerous environmental constraints imposed in various countries. Because of these reasons, and environmental restrictions on certain public works, ground improvement has now become an integrated and essential component of infrastructure development. Consequently, civil engineers are forced to utilise even the …
Application Of Vacuum Consolidation For Sustainable Transport Infrastructure, Cholachat Rujikiatkamjorn, Buddhima Indraratna
Application Of Vacuum Consolidation For Sustainable Transport Infrastructure, Cholachat Rujikiatkamjorn, Buddhima Indraratna
Faculty of Engineering - Papers (Archive)
A system of vertical drains combined with vacuum preloading to accelerate soil consolidation by promoting radial flow is an effective method. In this paper, the analytical modelling of vertical drains incorporating vacuum preloading in an axisymmetric condition is proposed. The distribution of vacuum pressure along the drain and variations in volume compressibility, and permeability of soil based on large scale laboratory observations are included in the proposed solutions. These analytical predictions are compared with a case history taken from Thailand where the entire embankment was stabilised with vertical drains and subjected to vacuum preloading. This analysis employing the writer’s model …
Physical Modelling Of Soft Clay Consolidation Using Vacuum-Surcharge Method, Cholachat Rujikiatkamjorn
Physical Modelling Of Soft Clay Consolidation Using Vacuum-Surcharge Method, Cholachat Rujikiatkamjorn
Faculty of Engineering - Papers (Archive)
In Ihis paper, the large-scalc consolidation apparatus was employed to investi gate the performance of vacuum prelollding with conventional surcharge loading. Several tests were conducted \0 examine the efTect of a vacuum and associ(lled paTHlllclers Slich as smC:!T zone and soil permeability characteristics. The measured settlement and excess pore pressure indi cates that the vacuum application has certain benefits to control excess pore pressure for a given total loading applictlti on. The analyticn l modelling for rad ial consolidation and vacuum prcloading considering both variation of soil comprcssibility and perrneability was cmployed to predict the soil consolidation behaviour. It is …
Radial Consolidation Modelling Incorporating Downdrag Effect For A Multi-Layer Soil, Cholachat Rujikiatkamjorn, Buddhima Indraratna
Radial Consolidation Modelling Incorporating Downdrag Effect For A Multi-Layer Soil, Cholachat Rujikiatkamjorn, Buddhima Indraratna
Faculty of Engineering - Papers (Archive)
A system of vertical drains (PVDs) with preloading is a successful method for promoting horizontal drainage and accelerating soil consolidation. A piecewise technique is used to capture the radial consolidation in the multi-layer soil system to incorporate (a) the effect of soil downdrag and (b) smear zone where soil permeability varying linearly. The effect of soil dragged down from the upper soil layer into the lower layer has been analysed in terms of required time for consolidation. It can be seen that the consolidation of the multi layer soil depends on the interaction between 2 adjacent layer, penetration depth, and …
Non-Linear Analysis Of Soft Ground Consolidation At The Ballina By-Pass, Xueyu Geng, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Richard Kelly
Non-Linear Analysis Of Soft Ground Consolidation At The Ballina By-Pass, Xueyu Geng, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Richard Kelly
Faculty of Engineering - Papers (Archive)
This study presents a numerical assessment of consolidation under vacuum preloading with a system of vertical drains and membrane, considering the non-linear properties of the soil This membrane system, already widely used in Australia, is where an airtight membrane is placed over the drainage layer to allow a vacuum to be distributed within the sand platform, along the surface of the soil, and down the vertical drains. To date, there have only been a few fundamental investigations and field studies that have tried to assess the way in which the vacuum can propagate in soft clay, both laterally and vertically. …
Performance And Prediction Of Vacuum Combined Surcharge Consolidation At Port Of Brisbane, Buddhima Indraratna, Jayantha Ameratunga, Cholachat Rujikiatkamjorn, Harry G. Poulos, A S. Balasublamaniam
Performance And Prediction Of Vacuum Combined Surcharge Consolidation At Port Of Brisbane, Buddhima Indraratna, Jayantha Ameratunga, Cholachat Rujikiatkamjorn, Harry G. Poulos, A S. Balasublamaniam
Faculty of Engineering - Papers (Archive)
During the past decade, the application of vacuum pressure for stabilising soft coastal clay and other low-lying estuarine soils has become increasingly popular in Australia, mainly due to the proven costeffectiveness in view of the significantly reduced time for achieving a high degree of consolidation and enhanced shear strength. Due to an increase in trade activities at the Port of Brisbane, new facilities on Fisherman Islands at the mouth of the Brisbane River will be constructed on the new outer area (235ha) adjacent to the existing port facilities via land reclamation. A scheme of vacuum assisted surcharge load in conjunction …
Consolidation Behavior Of Soil-Cement Column Improved Ground, Suksun Horpibulsuk, Avirut Chinkulkitniwat, Arnon Cholphatsorn, Jirayut Suebsuk, Martin D. Liu
Consolidation Behavior Of Soil-Cement Column Improved Ground, Suksun Horpibulsuk, Avirut Chinkulkitniwat, Arnon Cholphatsorn, Jirayut Suebsuk, Martin D. Liu
Faculty of Engineering - Papers (Archive)
Columnar inclusion is one of the effective and widely used methods for improving the engineering properties of soft clay ground. This article investigates the consolidation behavior of composite soft clay ground using both physical model tests under an axial-symmetry condition and finite element simulations using the PLAXIS 2D program. It was determined that the final settlement and the rate of consolidation of the composite ground depended on the stress state. For an applied stress that is much lower than the failure stress, the final settlement of the composite ground was lower, and the consolidation was rapid. When the soil–cement column …
Anisotropy In The Permeability And Consolidation Characteristics Of Dredged Mud, Dhanya Ganesalingam, Jayantha Ameratunga, Guy Schweitzer, Peter Boyle, Nagaratnam Sivakugan
Anisotropy In The Permeability And Consolidation Characteristics Of Dredged Mud, Dhanya Ganesalingam, Jayantha Ameratunga, Guy Schweitzer, Peter Boyle, Nagaratnam Sivakugan
Faculty of Engineering and Information Sciences - Papers: Part A
Dredging and land reclamation is a billion dollar industry that is spread around the coastal regions of Australia. Maintenance dredging is carried out regularly in many major Australian ports and in several cases the dredged mud is pumped ashore into containment paddocks at high water contents. When the dredged mud settles, there can be segregation with possible anisotropy. The sedimentation of the dredged mud is followed by self-weight consolidation which can take a long time. To accelerate the consolidation process, prefabricated vertical drains and surcharge are often used. To analyse the consolidation process of the dredged mud with vertical drains …
Compressibility And Hydraulic Conductivity Of Zeolite-Amended Soil-Bentonite Backfills, Catherine Hong, Charles D. Shackelford, Michael A. Malusis
Compressibility And Hydraulic Conductivity Of Zeolite-Amended Soil-Bentonite Backfills, Catherine Hong, Charles D. Shackelford, Michael A. Malusis
Faculty Journal Articles
The effect of zeolite amendment for enhanced sorption capacity on the consolidation behavior and hydraulic conductivity, k, of a typical soil-bentonite (SB) backfill for vertical cutoff walls was evaluated via laboratory testing. The consolidation behavior and k of test specimens containing fine sand, 5.8 % (dry wt.) sodium bentonite, and 0, 2, 5, or 10 % (dry wt.) of one of three types of zeolite (clinoptilolite, chabazite-lower bed, or chabazite-upper bed) were measured using fixed-ring oedometers, and k also was measured on separate specimens using a flexible-wall permeameter. The results indicated that addition of a zeolite had little impact …
Brooklyn's Thirst, Long Island's Water: Consolidation, Local Control, And The Aquifer, Jeffrey A. Kroessler
Brooklyn's Thirst, Long Island's Water: Consolidation, Local Control, And The Aquifer, Jeffrey A. Kroessler
Publications and Research
The creation of greater New York City in 1898 promised a solution to the problem of supplying Brooklyn and Queens with water. In the 1850s, the City of Brooklyn tapped ponds and streams on the south side of Queens County, and in the 1880s, dug wells for additional supply. This lowered the water table and caused problems for farmers and oystermen, many of whom sued the city for damages. Ultimately, salt water seeped into some wells from over-pumping. By 1896, Brooklyn’s system had reached its limit. Prevented by the state legislature from tapping the aquifer beneath Suffolk’s Pine Barrens, the …
Consolidation Of Ground With Partially Penetrated Pvds Combined With Vacuum Preloading, Xueyu Geng, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Consolidation Of Ground With Partially Penetrated Pvds Combined With Vacuum Preloading, Xueyu Geng, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Faculty of Engineering - Papers (Archive)
Partially penetrating prefabricated vertical drain (PVDs) with a combined surcharge and vacuum preloading are considered in this paper. The analysis results can be used in cases where the soft soil clay is too deep and not economical to be penetrated to full depth, or the surcharge preloading is too small to justify full penetration of soft clay layer or the vacuum pressure can be lost, which is caused by the permeability of the bottom of the clay for the fully penetrated drain etc.. In this model, a virtual vertical drain is assumed to reflect the real three-dimensional seepage in the …
Performance And Prediction Of Vacuum Combined Surcharge Consolidation At Port Of Brisbane, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Xueyu Geng, Jayantha Ameratunga, Peter Boyle
Performance And Prediction Of Vacuum Combined Surcharge Consolidation At Port Of Brisbane, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Xueyu Geng, Jayantha Ameratunga, Peter Boyle
Faculty of Engineering - Papers (Archive)
During the past decade, the application of vacuum preloading for stabilising soft coastal clay and other low-lying estuarine soils has become popular in Australia. The cost-effectiveness is a major factor in most projects in view of the significantly reduced time for achieving a relatively high degree of consolidation. Due to an increase in trade activities at the Port of Brisbane, new facilities on Fisherman Islands at the mouth of the Brisbane River will be constructed on the new outer area (235 ha) adjacent to the existing port facilities via land reclamation. A vacuum assisted surcharge load and conventional surcharge scheme …
Vertical Drain Consolidation Analysis In One, Two And Three Dimensions, Rohan T. Walker
Vertical Drain Consolidation Analysis In One, Two And Three Dimensions, Rohan T. Walker
Faculty of Engineering - Papers (Archive)
A new method, the g or 'eta' method, for modeling consolidation by vertical and horizontal drains is presented. The approach is applicable in one, two and three dimensional as well as axisymmetric cases. Material and geometry properties are familiar from unit cell vertical drain analysis and are consistent across dimensions. An uncoupled finite element method (FEM) program is used to test the efficacy of the new approach. Because drains are not explicitly modeled in the finite element mesh, mesh complexity and computational time are greatly reduced. Unlike existing plane strain matching methods there is no special transformation of permeability or …
Consolidation By Vertical Drain Beneath A Circular Embankment Using Analytical And Numerical Modelling, Cholachat Rujikiatkamjorn, Buddhima Indraratna, A Aljorany
Consolidation By Vertical Drain Beneath A Circular Embankment Using Analytical And Numerical Modelling, Cholachat Rujikiatkamjorn, Buddhima Indraratna, A Aljorany
Faculty of Engineering - Papers (Archive)
When prefabricated vertical drains (PVDs) are installed beneath circular embankment (i.e. circular oil tanks or silos), the system of vertical drains can be replaced by axisymmetric concentric rings with equivalent drain walls. A value for the equivalent coeffi cient of soil permeability must be obtained to provide the same degree of consolidation. A rigorous solution for PVDs installed under circular embankment is proposed and verifi ed by comparing its results with conventional unit cell model. The model is then validated via the consolidation process by vertical drains at the Skå-Edeby circular test embankment (Area II). The calculated values of settlement, …
Consolidation Analysis Of A Stratified Soil With Vertical And Horizontal Drainage Using The Spectral Method, Rohan Walker, Buddhima Indraratna
Consolidation Analysis Of A Stratified Soil With Vertical And Horizontal Drainage Using The Spectral Method, Rohan Walker, Buddhima Indraratna
Faculty of Engineering - Papers (Archive)
A novel use of the spectral method to determine excess pore water pressure during vertical consolidation of multi-layered soil with time constant material properties is presented, considering a unit cell with combined vertical and radial drainage. Equal strain conditions are assumed in the analysis. The novel adoption of material properties that vary in a linear fashion with depth allows arbitrary distributions of properties to be modelled. By incorporating surcharge and vacuum loading that vary with both depth and time, a wide range of consolidation problems can be analysed. The spectral method is a meshless approach producing a series solution to …