A study on interface shear behaviour of soil nails from pullout and direct shear tests

2020 ◽  
Vol 20 (1) ◽  
pp. 24-37 ◽  
Author(s):  
Mahesh Sharma ◽  
Manojit Samanta ◽  
Shantanu Sarkar
Keyword(s):  
Shear Behaviour ◽  
Direct Shear ◽  
Shear Tests ◽  
Interface Shear ◽  
Soil Nails ◽  
Direct Shear Tests

scholarly journals Sand- and Clay-Photocured-Geomembrane Interface Shear Characteristics Using Direct Shear Test

2021 ◽  
Vol 13 (15) ◽  
pp. 8201
Author(s):  
Lihua Li ◽  
Han Yan ◽  
Henglin Xiao ◽  
Wentao Li ◽  
Zhangshuai Geng
Keyword(s):  
Soil Surface ◽  
Friction Angle ◽  
Direct Shear ◽  
Tensile Crack ◽  
Shear Tests ◽  
Interface Shear ◽  
Direct Shear Tests ◽  
Carbon Black Powder ◽  
Shear Characteristics ◽  
Impermeable Layer

It is well known that geomembranes frequently and easily fail at the seams, which has been a ubiquitous problem in various applications. To avoid the failure of geomembrane at the seams, photocuring was carried out with 1~5% photoinitiator and 2% carbon black powder. This geomembrane can be sprayed and cured on the soil surface. The obtained geomembrane was then used as a barrier, separator, or reinforcement. In this study, the direct shear tests were carried out with the aim to investigate the interfacial characteristics of photocured geomembrane–clay/sand. The results show that a 2% photoinitiator has a significant effect on the impermeable layer for the photocured geomembrane–clay interface. As for the photocured geomembrane–sand interface, it is reasonable to choose a geomembrane made from a 4% photoinitiator at the boundary of the drainage layer and the impermeable layer in the landfill. In the cover system, it is reasonable to choose a 5% photoinitiator geomembrane. Moreover, as for the interface between the photocurable geomembrane and clay/sand, the friction coefficient increases initially and decreases afterward with the increase of normal stress. Furthermore, the friction angle of the interface between photocurable geomembrane and sand is larger than that of the photocurable geomembrane–clay interface. In other words, the interface between photocurable geomembrane and sand has better shear and tensile crack resistance.

scholarly journals Pile Side Resistance in Sands for the Unloading Effect and Modulus Degradation

2019 ◽  
Vol 69 (334) ◽  
pp. 185 ◽  
Author(s):  
C. F. Zhao ◽  
Y. Wu ◽  
C. Zhao ◽  
Q. Z. Zhang ◽  
F. M. Liu ◽  
...  
Keyword(s):  
Shear Stress ◽  
Maximum Amount ◽  
Interface Roughness ◽  
Direct Shear ◽  
Shear Tests ◽  
Interface Shear ◽  
Direct Shear Tests ◽  
Side Resistance ◽  
Unloading Effect ◽  
Concrete Interface

A total of 36 groups of sand-concrete interface loading and unloading direct shear tests were used to analyze the mechanical properties of the pile side-soil interface. The test results show that the interface residual shear stress for the same applied normal stress tends to be constant for the rough sand-concrete interface. The initial shear modulus and peak shear stress of the interface both decrease with the degree of unloading and increase with the interface roughness. The maximum amount of interface shear dilatancy increases with the degree of unloading, and the maximum amount of interface shear shrinkage decreases with unloading for the same interface roughness. A pile side resistance-displacement model is established using the shear displacement method. The proposed function considers both the radial unloading effect and modulus degradation of soil around the pile. The effect of radial unloading and interface roughness on the degradation of the equivalent shear modulus is analyzed using a single fitting parameter b. Good agreement of the proposed model is confirmed by applying the direct shear tests of the 36 groups.

Numerical direct shear tests to model the shear behaviour of rock joints

2013 ◽  
Vol 51 ◽  
pp. 101-115 ◽  
Author(s):  
M. Bahaaddini ◽  
G. Sharrock ◽  
B.K. Hebblewhite
Keyword(s):  
Rock Joints ◽  
Shear Behaviour ◽  
Direct Shear ◽  
Shear Tests ◽  
Direct Shear Tests

Measurement of unsaturated soil – geomembrane interface shear-strength parameters

2007 ◽  
Vol 44 (1) ◽  
pp. 78-88 ◽  
Author(s):  
J S Sharma ◽  
I R Fleming ◽  
M B Jogi
Keyword(s):  
Shear Strength ◽  
Normal Stress ◽  
Pore Pressure ◽  
Unsaturated Soil ◽  
Pressure Transducer ◽  
Shear Behaviour ◽  
Direct Shear ◽  
Shear Tests ◽  
Interface Shear Strength ◽  
Interface Shear

Laboratory tests of soil–geomembrane interface shear strength are typically carried out with no provision for the measurement of pore pressures at the soil–geomembrane interface. This paper describes a series of soil–geomembrane interface shear tests carried out with continuous measurement of suction close to the interface during the shearing process. The tests were conducted using a modified direct shear box with a miniature pore-pressure transducer installed adjacent to the surface of the geomembrane. Results of the interface shear tests conducted using this method show that it is quite effective in evaluating shear behaviour at the interface between a geomembrane and an unsaturated soil at low matric suction values. The results suggest that soil suction contributes to shearing resistance at low normal stress values. At higher normal stress values, the interface shear behaviour appears to be governed only by the magnitude of total normal stress.Key words: geomembrane, interface shear strength, suction, direct shear test, pore-pressure transducer.

scholarly journals Rapid prototyping of geosynthetic interfaces: Investigation of peak strength using direct shear tests

2017 ◽  
Vol 45 (6) ◽  
pp. 674-687 ◽  
Author(s):  
Gary John Fowmes ◽  
Neil Dixon ◽  
Liwei Fu ◽  
Catalin Alexandru Zaharescu
Keyword(s):  
Rapid Prototyping ◽  
Peak Strength ◽  
Direct Shear ◽  
Shear Tests ◽  
Direct Shear Tests
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