Author: Sean Elliott Salazar Publisher: ISBN: Category : Soil mechanics Languages : en Pages : 320
Book Description
Accurate measurement of axial, radial, and volumetric strain parameters are critical to the understanding of phase relationships and the constitutive behavior for saturated and unsaturated soils. The use of photographic monitoring techniques for laboratory-based measurement of these parameters have become common. A novel technique that utilized camera instrumentation located within the triaxial testing cell was developed and validated. By placing the instrumentation inside of the cell, instead of the instrumentation being located outside of the cell, the technique eliminated cumbersome corrections required to account for optical distortions due to 1) the refraction of light at the confining fluid-cell wall-atmosphere interfaces, 2) the curvature of the cylindrical cell wall, and 3) the deformation of the cell wall induced by changes in cell pressure. Digital images of various soil and analog (brass, acrylic) specimens were captured within the triaxial apparatus during testing. The images were processed using the principles of close-range photogrammetry to construct three-dimensional models of the specimens. The models were analysed to determine surface deformation and total volume of the specimens. Additionally, the models obtained from triaxial tests performed on the soil samples were compared to quantify deformation and volume of the sample as a function of axial strain. Sensitivity studies and evaluation of measurement accuracy for the internal, close-range photogrammetry approach are documented herein. Specimen volume, as obtained using the approach, was compared with volume obtained from four other techniques, including: DSLR camera photogrammetry, 3D structured light scanning, manual measurements (caliper and pi tape), and water displacement. A relative error of 0.13 percent was assessed for the internal photogrammetry technique. The viability of determining total and local strains, volumetric changes, and total volume at any stage of triaxial testing was demonstrated through undrained triaxial compression and extension tests. Results from all tests are presented herein. The use of the internal, close-range photogrammetry technique is recommended.
Author: Sean E. Salazar Publisher: ISBN: Category : Algorithms Languages : en Pages : 8
Book Description
A triaxial testing cell was instrumented with an internal camera monitoring system. By placing the camera monitoring system inside of the triaxial cell, optical distortions due to refraction at the confining fluid-cell wall and cell wall-atmosphere interfaces and the curvature of the cell wall were eliminated. The components of the system are presented. Furthermore, the photogrammetric techniques that were utilized to analyze the photographs that were captured from within the triaxial cell are discussed. The proposed methods for acquiring and analyzing the photographs are presented and the potential for the inclusion of an internal camera-monitoring system for triaxial testing applications are discussed.
Author: Amirhassan Mehdizadeh Publisher: ISBN: Category : Photogrammetry Languages : en Pages : 4
Book Description
Salazar et al. (2015) presented a new method to measure the volume and volumetric strains of soil specimen during the triaxial test. To eliminate the optical distortions due to refraction at the fluid-cell wall and cell wall-atmosphere interfaces, they installed a camera-based system inside the triaxial cell. The discussers wished to highlight some points about taking into account the refraction of light and other related issues in image processing for evaluating the volumetric strains and show that there is another simple way to overcome this problem.
Author: Ning Lu Publisher: Springer ISBN: 303006249X Category : Science Languages : en Pages : 361
Book Description
This single-volume thoroughly summarizes advances in the past several decades and emerging challenges in fundamental research in geotechnical engineering. These fundamental research frontiers are critically reviewed and described in details in lights of four grand challenges our society faces: climate adaptation, urban sustainability, energy and material resources, and global water resources. The specific areas critically reviewed, carefully examined, and envisioned are: sensing and measurement, soil properties and their physics roots, multiscale and multiphysics processes in soil, geochemical processes for resilient and sustainable geosystems, biological processes in geotechnics, unsaturated soil mechanics, coupled flow processes in soil, thermal processes in geotechnical engineering, and rock mechanics in the 21st century.
Author: Dominic Ek Leong Ong Publisher: Springer Nature ISBN: 9811693722 Category : Science Languages : en Pages : 329
Book Description
This book highlights recent advancements and innovations in trenchless technology via the adoption of combined micro-tunnelling and pipe-jacking techniques. This technique is more environmentally friendly, cost effective, less time-consuming and less disruptive compared to conventional open trench excavations for urban construction and urban infrastructure renewal projects. Pipe jacking is a non-destructive technique used in the installation of underground pipelines using a tunnel boring machine (TBM) and thrust forces derived from the hydraulic jack set-up in a deep jacking shaft. It is popular and commonly used worldwide for the installation of sewer and common services cable tunnels as well as for oil and gas pipelines.
Author: Erol Tutumluer Publisher: Springer Nature ISBN: 3030772349 Category : Science Languages : en Pages : 976
Book Description
This volume presents selected papers presented during the 4th International Conference on Transportation Geotechnics. The papers address the geotechnical challenges in design, construction, maintenance, monitoring, and upgrading of roads, railways, airfields, and harbor facilities and other ground transportation infrastructure with the goal of providing safe, economic, environmental, reliable and sustainable infrastructures. This volume will be of interest to postgraduate students, academics, researchers, and consultants working in the field of civil and transport infrastructure.
Author: Poul V. Lade Publisher: John Wiley & Sons ISBN: 1119106591 Category : Technology & Engineering Languages : en Pages : 424
Book Description
Triaxial Testing of Soils explains how to carry out triaxial tests to demonstrate the effects of soil behaviour on engineering designs. An authoritative and comprehensive manual, it reflects current best practice and instrumentation.References are made throughout to easily accessible articles in the literature and the books focus is on how to obtain high quality experimental results.
Author: José Fernando Thome Jucá Publisher: CRC Press ISBN: 9789058093738 Category : Science Languages : en Pages : 472
Book Description
Unsaturated materials comprise residua, collapsible and expansive naturally occurring soils, compacted soils and, more recently, residues of solid wastes. The engineering problems associated with unsaturated materials range from those related to conventional geotechnical works (e.g. foundations, pavements, slopes and excavations, retaining structures, earthdams, irrigation canals, tunnelling, compacted embankments) to those included in the environmental area (e.g. natural slope instability, erosion and subsidence processes, tailings, residues or solid waste disposal, contaminant transport, remediation of contaminant sites, engineered barriers for environmental protection, re-use of residues). This book, published in three separate volumes, comprises a selection of selected and invited papers presented at the Third International Conference on Unsaturated Soils – UNSAT ‘2002 – that took place in Recife, Brazil, form 10th to 13th March 2002. The book is of interest to consultants, researchers, practitioners, lecturers and students with a background in geotechnical engineering, environmental engineering and engineering geology.
Author: Sean Elliott Salazar
Author: Sean E. Salazar
Author: Amirhassan Mehdizadeh
Author: Ning Lu
Author: Dominic Ek Leong Ong
Author: Erol Tutumluer
Author: Poul V. Lade
Author: 
Author: José Fernando Thome Jucá
Author: National Research Council Canada