Related Papers
Soil Mechanics and Foundation Engineering
Effect of Particle Size Distribution on Soil-Steel Interface Shear Behavior
2017 •
Yonghong Hao
Geosciences
Influence of Surface Roughness and Particle Characteristics on Soil–Structure Interactions: A State-of-the-Art Review
2022 •
Dominic Ong
The study of soil–structure interface behavior contributes to the fundamental understanding of engineering performance and foundation design optimization. Previous research studies the effect of soil characteristics and surface roughness property on the soil–material interface mechanism via interface shear test. The reviews utilizing past established laboratory studies and more recent tests based on state-of-the-art technologies reveal that surface roughness significantly affects interface shear performances in the studies of soil–structure interactions, especially in peak shear strength development. A preliminary but original investigative study by the authors was also carried out using a sophisticated portable surface roughness gauge to define the material surface roughness properties in order to study the interface behavior parametrically. Additionally, using the authors’ own original research findings as a proof-of-concept innovation, particle image velocimetry (PIV) technology ...
American Journal of Engineering and Applied Sciences
Evaluating the Effect of Soil Particle Characterization on Internal Friction Angle
2021 •
Arezou Rasti
One of the critical design parameters used in evaluating soil structure is the friction angle, derived from Mohr's Circle failure criterion. The soil friction angle is an engineering parameter estimated in the laboratory to quantify the soil shear strength in geotechnical applications. This paper indicates an experimental study investigating the impact of particle size on different sandy soils shear strength behavior. The direct shear test equipment is useful for simulating various stress regimes to determine the soil strength by employing a slow moving lateral force to a consolidated sample along a shear plane. A series of direct shear tests were conducted to investigate the interface behavior of soil. Soil samples were selected from different locations in New Mexico, United States. The influence of soil particle size on the soil's shear strength behavior is discussed by performing a series of symmetric direct shear tests according to ASTM D3080 and analyzing the results. To minimize errors, electronic transducers were used to measure vertical and horizontal displacements. DS7 is geotechnical testing software controlling the test by utilizing a data logger. The investigation indicates that the maximum vertical deformation for all different kinds of sandy soils accrued simultaneously. It was concluded that a soil's friction angle is affected by coarse-grained material. Accordingly, sandy soils with bigger particle size record a higher friction angle than soils containing small particles. Furthermore, a non-linear regression analysis was performed to determine the direct relationship between soil's friction angle and soil particle characteristics.
Geotechnical Research
Impact of highly weathered geology on pipe-jacking forces
2017 •
Dominic Ong
For the Kuching Wastewater Management System Phase 1 project in Kuching, Malaysia, 7·7 km of trunk sewer lines were constructed in the highly fractured, highly weathered Tuang Formation using a pipe-jacking method. The pipelines were founded at depths of up to 35 m below Kuching City, where the majority of the pipe-jacking activities would traverse the Tuang Formation. Jacking forces in highly fractured geology are not well understood as most jacking force models were derived for drives traversing soils. Therefore, a novel method was developed, whereby equivalent rock strength characteristics were interpreted from direct shear testing on reconstituted tunnelling rock spoils. Tangential peak strength parameters, [Formula: see text] and [Formula: see text], were developed from the nonlinear behaviour of the reconstituted spoils and applied to a well-established jacking model to assess arching and development of jacking forces from four documented drives. The back-analysed parameters μ...
Assessment method for clay clogging and disintegration of fines in mechanised tunnelling
Paulo Henrique Gines
Shield tunnelling in fine-grained soils is frequently obstructed by clogging. The clogging risk of soils depends on multiple mineralogical and soil-mechanical parameters. The existing approach of estimating the clogging potential, which is derived from the indices of plasticity and consistency, has proven to be beneficial for practical purposes. Furthermore, the disintegration of fines from a cohesive soil within free water, such as slurry, has also shown to have a major negative impact on shield tunnelling. Both risks depend on the properties of the soils as well as the hydrogeological and operational conditions. Soils can be transformed to critical consistencies for clogging depending on the extent of water being available in the excavation process (ground water or support slurry). Reverse transformation into the natural consistency during tunnelling is not possible. Measures to reduce clogging often involve artificial increase of the water content to obtain less critical consistencies. A new diagram allows for the quantification of changes in the water content and thus, estimating changes in the consistency of fine-grained soils under different boundary conditions (availability of water).
Residual shear strength of clay-structure interfaces
2010 •
Ammar Rouaiguia
The interface between structures and soils is a critical problem in geotechnical engineering. Understanding the shear strength of soil-structure interfaces is important in determining wall or shaft friction for retaining walls and piles, anchor rods, deep foundations, reinforced earth, and buried pipelines. This study deals with laboratory tests on six different clays, three Algerian clays namely: Kaolin1, Kaolin2, and Kaolin3. Three British clays namely : Keuper marl, London clay, and Lias clay. The testing procedures included modified direct shear tests. Each clay was sheared alone, under normally consolidated drained conditions, and against both Sandstone rock and glass. These tests defined the minimum residual strength obtained in each case and provided a basis for a comparison with other published research. It is demonstrated that the residual strength depends mainly on the interface material and its roughness, the properties of the soil, and the magnitude of the clay fraction....
International Journal of Geotechnical Engineering
Analysis of sequential active and passive arching in granular soils
2018 •
Khaled Aqoub
Geotextile and Geomembranes
A new large scale shear apparatus for testing geosynthetics soil interfaces
2024 •
Ahmad Mousa
: Geosynthetics-soil interfaces are exposed to varying temperatures coupled with complex stress states. Quantifying, the mechanical response of the interface considering this combined influence is always a huge challenge. This study proposes a new displacement and stress-loading static and dynamic shear apparatus that is capable of testing the geosynthetics-soil interfaces with temperature control. The apparatus satisfactorily simulates monotonic and cyclic direct shear tests, and creep shear tests on geosynthetics-soil interfaces at temperatures ranging from -30℃ to 200℃. To validate the functionality of this device, a series of temperature-controlled experiments were conducted on different types of interfaces (sand-geogrid interfaces, sand-textured geomembrane interfaces, sand-smooth geomembrane interfaces). The experimental results indicate that the apparatus can simulate static, dynamic, and creep shear loading on geosynthetics-soil interfaces in high and low-temperature environments, and these can be measured reliably. Also, the temperature has a non-negligible influence on all mechanical interface responses. These findings highlight the significance and potential of the proposed apparatus and its practical implications.
Geotechnics
A Review of Sand–Clay Mixture and Soil–Structure Interface Direct Shear Test
2021 •
Giulio Sciarra
Natural soils are usually heterogeneous and characterized with complex microstructures. Sand–clay mixtures are often used as simplified soils to investigate the mechanical properties of soils with various compositions (from clayey to sandy soils) in the laboratory. Performing laboratory tests on a sand–clay mixture with definite clay fraction can provide information to understand the simplified soils’ mechanical behavior and better predict natural soils’ behavior at the engineering scale. This paper reviews previous investigations on sand–clay mixture and soil–structure interface direct shear test. It finds that even though there are many investigations on sand–clay mixtures and soil–structure interfaces that consider pure sand or pure clay, limited data on the mechanical behavior of the interface between sand–clay mixture and structure materials are available. Knowledge is missing on how the clay content influences the mechanical behavior of interface and how the soil particles’ ar...
Geotechnical Frontiers 2017
Soil/Geosynthetic Interface Strengths from Torsional Ring Shear Tests
2017 •
Timothy Stark
