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Full-Text Articles in Engineering

Track Doubling Project For Northeastern Line, Chawalit Tanomtin, Doungdeeying, R Nov 2019

Track Doubling Project For Northeastern Line, Chawalit Tanomtin, Doungdeeying, R

Shotcrete for Underground Support XIV

Track Doubling Project for Northeastern Line Mab Kabao – Thanon Chira Junction Contract C3 – Tunnel Works is situated in Saraburi Province and Nakhon Ratchasima Province of Central and Northeastern Thailand. It comprises of three railway tunnels with a total distance of 12.5 km. It is one of the flagship track doubling projects of the State Railways of Thailand of which the contract was awarded to the Joint Venture of ITD – RT as an EPC contractor. The stabilization works of the tunnel during construction period and for its long-term use with utmost safety of the workers and the train passengers is ...


3d Tunnel Inspection With Photogrammetric And Hybrid Systems, Michael Mett, Heiner Kontrus, Nina Müller, Stefan Eder Nov 2019

3d Tunnel Inspection With Photogrammetric And Hybrid Systems, Michael Mett, Heiner Kontrus, Nina Müller, Stefan Eder

Shotcrete for Underground Support XIV

The trend in tunnel assessment is towards comprehensive 3D measurement, either based on high quality digital imagery (photogrammetric systems) or the combination of laser and photo systems (hybrid systems). With digital 3D data, quantification and categorization of damage to the tunnel surface as well as the determination of thickness or volumes of layers (e.g. shotcrete) can performed in a comprehensive, fast and economic way.

The faster such tunnel assessment can be executed on site, the lower are the tunnel block times and environmental impairments related to the building measures. The costs for the operating companies can be significantly reduced ...


Shotcrete Of The Outer Shell And The Sealing System, Dietmar Maehner Nov 2019

Shotcrete Of The Outer Shell And The Sealing System, Dietmar Maehner

Shotcrete for Underground Support XIV

This report deals with the loading of the geomembrane during the construction phase of the inner shell of a tunnel. In a systematic parameter analysis at the institute for underground construction at FH Münster the geomembrane and the geotextile were tested under different realistic conditions. Laboratory testing showed a dependence on the seal support surface of the shotcrete and on the characteristics of the geotextile. The deformations of the membranes due to fresh concrete pressure are significantly smaller than the permitted values in the technical regulations.

Please download the abstract file for full content.


Stability Analysis And Reinforcement Of The Existing Karst Cave Passing Through Yujingshan Tunnel, Junsheng Yang, Yipeng Xie, Chaoyun Zhou, Cong Zhang, Xiong Liang Nov 2019

Stability Analysis And Reinforcement Of The Existing Karst Cave Passing Through Yujingshan Tunnel, Junsheng Yang, Yipeng Xie, Chaoyun Zhou, Cong Zhang, Xiong Liang

Shotcrete for Underground Support XIV

High-speed Railway tunneling in karst terrain presents a huge challenge to the engineer including the identification, stability analysis and reinforcement of the karst cavities. The Cheng-Gui high-speed railway tunnel had to pass through the largest karst cave discovered in tunnel construction. To guaranteeing the tunnel construction safety, a series of corresponding prevention and control measures are put forward. To begin with, geological drilling, electromagnetic method and surface electrical resistivity tomography are adopted to detect and delineate the underground karst zone. Based on the detection results, this paper has put forward strategies to make the pre-support of karst cave and the ...


Investigations Regarding The Pumping Process Of Wet-Mix Shotcrete Improvement And Upgrading Of Underground Traffic Structures, Johannes Flotzinger, Maria Thumann, Florian Steindl, Florian Mittermayr, Benedikt Lindlar, Wolfgang Kusterle Nov 2019

Investigations Regarding The Pumping Process Of Wet-Mix Shotcrete Improvement And Upgrading Of Underground Traffic Structures, Johannes Flotzinger, Maria Thumann, Florian Steindl, Florian Mittermayr, Benedikt Lindlar, Wolfgang Kusterle

Shotcrete for Underground Support XIV

Workability is a physical property of fresh concrete, which can’t be described with only one single parameter or measured with one single test method. Pumpability and sprayability plays an important role for wet-mix sprayed concrete. The material must be conveyed through the pipe without changing its properties and mix proportion. The mix should leave the nozzle in a uniform stream intermixed homogeneously with the accelerator.

When concrete is pumped through a pipe, a thin layer of paste is lubricating the wall of the pipe. The interaction of the lubricating layer and the pipe wall is of great importance for ...


Plastic Shrinkage Properties Of Natural Fiber Reinforced Shotcrete, Kyong-Ku Yun, Yoon-Sik Baek, Seung-Yeon Han, Yong-Gon Kim Nov 2019

Plastic Shrinkage Properties Of Natural Fiber Reinforced Shotcrete, Kyong-Ku Yun, Yoon-Sik Baek, Seung-Yeon Han, Yong-Gon Kim

Shotcrete for Underground Support XIV

Recently, natural hemp fibers have been developed for use in wet or dry mix shotcrete instead of conventional synthetic fibers made from petroleum. Synthetic fibers, which is mainly in polypropylene, has been used for controlling an initial shrinkage cracking in concrete, however, the effect was poor showing a severe plastic shrinkage cracking.

Plastic shrinkage cracking is a nonstructural crack that occurs due to the surface drying of concrete in a plastic condition due to rapid evaporation of bleeding water. The volume reduction due to plastic shrinkage and the resulting tensile stress exceeds the tensile strength of the concrete. In particular ...


Untersammelsdorf Tunnel – Challenges, Special Measures And Use Of Special Shotcrete For Tunneling In Lacustrine Clay, Matthias Beisler, Johannes Benedikt, Sebastian Höser, Hanns Wagner, Klaus Berger Nov 2019

Untersammelsdorf Tunnel – Challenges, Special Measures And Use Of Special Shotcrete For Tunneling In Lacustrine Clay, Matthias Beisler, Johannes Benedikt, Sebastian Höser, Hanns Wagner, Klaus Berger

Shotcrete for Underground Support XIV

The 665 m long, twin-track Untersammelsdorf Tunnel is being built in the course of the construction of the Koralmbahn line between Graz and Klagenfurt. The tunnel is located in extremely challenging subsoil conditions consisting of silty to fine sandy lacustrine deposits. The developed tunneling concept provided wide-ranging special underground engineering measures as piling, jet grouting and temporary struts and represents a unique construction method to date. Accordingly, numerous challenges arose in the design phase, which could be verified by carrying out extensive trials and investigations in the preparatory period or for which fallback levels had to be provided for the ...


Pumping Shotcrete: Past Knowledge Applied For Modern Shotcrete Mix Design, Marc Jolin Nov 2019

Pumping Shotcrete: Past Knowledge Applied For Modern Shotcrete Mix Design, Marc Jolin

Shotcrete for Underground Support XIV

No Abstract.


Geological 3d Analyses Of Tunnel Faces With Software And Hardware Tools Of Dibit, Stefan Eder, Heiner Kontrus, Florian König, Stefan Eder Nov 2019

Geological 3d Analyses Of Tunnel Faces With Software And Hardware Tools Of Dibit, Stefan Eder, Heiner Kontrus, Florian König, Stefan Eder

Shotcrete for Underground Support XIV

The measurement and visualization of tunnel structures is the main competence of Dibit Messtechnik GmbH (Innsbruck, Austria). As the inventor of modern 3D tunnel surveying at the end of the 1990s, Dibit is a leader in global surveying projects and develops innovative software and hardware tools for geological applications in tunnelling.

In tunnel construction, the trend is towards the comprehensive, digital 3D recording and mapping of tunnel faces, especially to measure and quantify geological structures, and to document geological conditions. This must be done under the pressure of time and the harsh conditions of progressive mining and result in objective ...


Design Optimization And Application Of Bolt-Shotcrete Support For East Tianshan Tunnel Project In China, Junsheng Yang, Li Linyi Nov 2019

Design Optimization And Application Of Bolt-Shotcrete Support For East Tianshan Tunnel Project In China, Junsheng Yang, Li Linyi

Shotcrete for Underground Support XIV

Bolt-shotcrete support is a form of support with low cost, convenient for construction, uniform structural stress, which is widely used in international tunnel engineering. In this paper, the 2# inclined shaft of East Tianshan tunnel in China is taken as the research object. The stress characteristics of composite lining support and bolt-shotcrete support are analyzed and compared by FLAC3D software, and the bolt-shotcrete support scheme suitable for this project is put forward. Based on the principle of orthogonal experiment, the most reasonable shotcrete material proportion is selected, and structural stress and displacement monitoring is carried out during the construction ...


Recent And Future Infrastructure Development In Thailand, Preedee Ngamsantikul Nov 2019

Recent And Future Infrastructure Development In Thailand, Preedee Ngamsantikul

Shotcrete for Underground Support XIV

No Abstract.


Evaluating The Cracking Potential Of Shotcrete, Marc Jolin Nov 2019

Evaluating The Cracking Potential Of Shotcrete, Marc Jolin

Shotcrete for Underground Support XIV

No Abstract.


Optimized Shotcrete Design For Irregular Tunnel Excavation, Gottfried Braun Nov 2019

Optimized Shotcrete Design For Irregular Tunnel Excavation, Gottfried Braun

Shotcrete for Underground Support XIV

No Abstract.


Meaningful Testing Of Fibre Reinforced Shotcrete For Lining Designs, Des Vlietstra, Ralf Winterberg Nov 2019

Meaningful Testing Of Fibre Reinforced Shotcrete For Lining Designs, Des Vlietstra, Ralf Winterberg

Shotcrete for Underground Support XIV

The routine use of Fibre Reinforced Shotcrete (FRS) as an integral component of ground support systems is well-established. FRS, employing steel or macro synthetic fibres, is used worldwide in service conditions ranging from low stress friable ground to high stress hard rock, and over a wide range of exposure conditions, often harsh, such as at high temperature, chemically aggressive ground or waters, static stresses and dynamic loadings, etc.

Shotcrete linings require a rotation capacity in order to follow ground movements while the arching effect in the surrounding rock mass develops. The fibre reinforcement within the shotcrete overcomes the brittleness of ...


Performance Improvement Of Shotcrete By Polymer Binder Modification, Klaus Bonin Nov 2019

Performance Improvement Of Shotcrete By Polymer Binder Modification, Klaus Bonin

Shotcrete for Underground Support XIV

Tunneling construction engineering cannot exist without sprayed concrete – whether it is in tunneling, mining or equivalent constructions. Underground construction is a vast field and will be of strategic urban importance in the future. On the one hand, many existing tunnels will need in short term repair work or enlargements, while there is huge demand for the construction of new ones.

Polymer-modified sprayed concrete is suitable for the most used wet shotcrete application, but, as it is also common to use dry shotcrete, it’s also possible to be used there.

The used polymer amount depends highly on the requirements, in ...


Sika Waterproofing Solutions For Tunnels (Traditional Excavation), Philippe Doriot Nov 2019

Sika Waterproofing Solutions For Tunnels (Traditional Excavation), Philippe Doriot

Shotcrete for Underground Support XIV

No Abstract.


Steelfibre For High Performance Shotcrete, The Way To More Cost Efficiency, Martin Eberli Nov 2019

Steelfibre For High Performance Shotcrete, The Way To More Cost Efficiency, Martin Eberli

Shotcrete for Underground Support XIV

This paper shows the relations between costs and time of high performance products and process optimazing.

Owner and at least contractors are under permanent cost and time pressure. The experiance in the shotcrete pumps and machine are in a high level in case of volume and performance. However looks the contractor for more value engineering too save money and time. The important step is to change the established way and optimazing the process to more efficiency. The ready mix are fast, well applicable and the end result of the concrete is allways in a good or high quality. Steel fibre ...


Advanced Lining Systems And Sealing Applications On Shotcrete Surface, Prof. Dr.-Ing Herbert Klapperich, Dr.-Ing. Lars Vollmert, Dipl.-Ing Marc Meissner Nov 2019

Advanced Lining Systems And Sealing Applications On Shotcrete Surface, Prof. Dr.-Ing Herbert Klapperich, Dr.-Ing. Lars Vollmert, Dipl.-Ing Marc Meissner

Shotcrete for Underground Support XIV

Shotcrete forms the basis of lining systems for sealing purposes, in tunnel applications as well as on excavated slopes of reservoirs etc. Levelling uneven subsurfaces of rock or gravelly fills, shotcrete provides a surface of a certain quality, meeting static requirements. Nevertheless, depending on the type of construction, hydraulic aspects require additional measures to fulfill the requirements on sealing purposes and thus the long-term performance of the entire structure. Membranes made from polyethylene, which are perfectly suited for long-term performance, are of high sensitivity against puncture stress resulting from uneven surfaces. Besides the improvement of shotcrete surfaces themselves, protection liners ...


Liaison Opening Slides, Prof. Dr.-Ing Herbert Klapperich Nov 2019

Liaison Opening Slides, Prof. Dr.-Ing Herbert Klapperich

Shotcrete for Underground Support XIV

No abstract provided.


Energy Sheet Pilings - A Milestone For Emission Free, Renewable Power Production, Bernd Vogl Nov 2019

Energy Sheet Pilings - A Milestone For Emission Free, Renewable Power Production, Bernd Vogl

Shotcrete for Underground Support XIV

No abstract provided.


Conference Program, Dr.-Ing. Matthias Beisler, Preedee Ngamsantikul, Dr.-Ing. Dr. H. C. Herbert Klapperich, Prof. Tarcisio Celestino, Chuchai Sujivorakul Nov 2019

Conference Program, Dr.-Ing. Matthias Beisler, Preedee Ngamsantikul, Dr.-Ing. Dr. H. C. Herbert Klapperich, Prof. Tarcisio Celestino, Chuchai Sujivorakul

Shotcrete for Underground Support XIV

No abstract provided.


Liaison Preface, Prof. Dr.-Ing Herbert Klapperich Nov 2019

Liaison Preface, Prof. Dr.-Ing Herbert Klapperich

Shotcrete for Underground Support XIV

The ECI-SUS XIV Conference in Nong Nouch Gardens, Pataya, Thailand had been a very successful one in that - longest running series - for more than four decades.

Many thanks to the chairs Matthias Beisler and Preedee Ngarmsantikul and all the presenters as well as to the participants - pretty international again and resprensenting the mix of stake holders.

The involvement of ITA - by a greeting message of the past president and former chair Tarcisio Celestino - and the national TUTG-society was most welcome.

The main focus of "SHOTCRETE" with its elements like research, design, materials, equipment etc. were presented and in addition a ...


Additive Manufacturing Of Monomer-Free Ormocer®-Based Composites For Dental And Audiological Application, Herbert Wolter, Carina Kolb, Somchith Nique Nov 2019

Additive Manufacturing Of Monomer-Free Ormocer®-Based Composites For Dental And Audiological Application, Herbert Wolter, Carina Kolb, Somchith Nique

Composites at Lake Louise 2019

Additive manufacturing has a great potential, especially in the medical area where patient individual parts are required. However, there is still a lack of biocompatible materials which are printable and meet the high requirements of the targeted fields of end-use application (indirect dental restoration and earmolds). For this purpose, new types of inorganic-organic hybridpolymers (ORMOCERÒs) with the indispensable biocompatibility, combined with an adapted profile of properties, have been developed.

Please click Additional Files below to see the full abstract.


Conference Program, John Kieffer, Meisha Shofner, Erik Spoerke Nov 2019

Conference Program, John Kieffer, Meisha Shofner, Erik Spoerke

Composites at Lake Louise 2019

No abstract provided.


Harvesting Energy From Low-Level Vibration Using Alternate Contacts Between Water Drop And Two Dielectric Materials, Jian Yu, David Ma Nov 2019

Harvesting Energy From Low-Level Vibration Using Alternate Contacts Between Water Drop And Two Dielectric Materials, Jian Yu, David Ma

Energy Harvesting from Infrastructure and Ocean Systems (EHIOS)

Advances in low-power electronics and distributed systems have stimulated significant interests in small-scale power supply systems that generate electricity from ambient environmental energy sources. Recently, the rich electrostatic phenomena at liquid-solid interfaces have spurred renewed interest in harvesting mechanical energy through electrostatics.

Please click Additional Files below to see the full abstract.


The Water Power Technologies Office And Powering The Blue Economy, Bill Mcshane Nov 2019

The Water Power Technologies Office And Powering The Blue Economy, Bill Mcshane

Energy Harvesting from Infrastructure and Ocean Systems (EHIOS)

No Abstract.


Conference Program, Huiming Yin, Muhammad R. Hajj, Lei Zuo, David T. Ma Nov 2019

Conference Program, Huiming Yin, Muhammad R. Hajj, Lei Zuo, David T. Ma

Energy Harvesting from Infrastructure and Ocean Systems (EHIOS)

No abstract provided.


Energy Harvesting For Micromobility Systems, Alex Kattamis, Zachary Lochner, Nov 2019

Energy Harvesting For Micromobility Systems, Alex Kattamis, Zachary Lochner,

Energy Harvesting from Infrastructure and Ocean Systems (EHIOS)

No Abstract.


Porous Radiative Cooling Paint For Building Thermal Management, Yuan Yang Nov 2019

Porous Radiative Cooling Paint For Building Thermal Management, Yuan Yang

Energy Harvesting from Infrastructure and Ocean Systems (EHIOS)

Surface coating with high solar reflectance and high thermal emittance are attractive for saving energy in buildings. Conventional paints typically have a solar reflactance < 93% due to UV and near infrared absorption. Here we demonstrate a porous PVdF copolymer surface coating that shows high solar reflectance of over 96% and high thermal emittance of 0.97. When it is placed under sunlight, it can be 6 oC cooler than the environment without any electricity.


Workshop 3: Business Cases For Integrated And Continuous Biomanufacturing, Jessica Molek, Daisie Ogawa Oct 2019

Workshop 3: Business Cases For Integrated And Continuous Biomanufacturing, Jessica Molek, Daisie Ogawa

Integrated Continuous Biomanufacturing IV

No Abstract.