Undrained Behavior of Macau Marine Clay with Various Strain Rates and Different Stress Histories

Wu, Shengshen; Lok, T. M. H.; Zhou, Annan

doi:10.1007/978-981-10-6713-6_81

Cited by 1 publication

(2 citation statements)

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“…It was evident that the undrained strength ratio increases with OCR, and it could be best fitted using SHANSEP equation (Ladd and Foott 1974). This finding agrees with the previously published results (Zhu and Yin 2000;Abdulhadi et al 2012;Gu et al 2016;Wu et al 2017). In addition, after the CU triaxial test, the final water content of the specimen was also measured, and it was found that the higher the OCR, the higher the final water content tends to be.…”

Section: Stress Pathssupporting

confidence: 88%

“…The performance of clay reinforced with OSC or GESC subjected to lateral loading has also been experimentally modelled by direct shear box tests Xu et al 2018). In addition, overconsolidated soils would be commonly encountered in excavations in the field as a result of overburden unloading, and thus, the stress-dependent behaviour of soils has also attracted some researchers' interest through Koconsolidated or isotropically consolidated triaxial tests (Zhu and Yin 2000;Abdulhadi et al 2012;Gu et al 2016;Wu et al 2017). Therefore, the effects of over consolidation ratio (OCR) on undrained shear strength, pore pressure change, Mohr circle and stress path were also investigated and interpreted in this study through the CU triaxial tests with pore pressure measurement.…”

Section: Introductionmentioning

confidence: 99%

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Interface and composite behaviour of geosynthetic-reinforced soils

Xu¹

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Reinforcing soils with geosynthetics can significantly improve their engineering behaviour and performance, mainly by increasing their bearing capacity, providing additional confinement, reducing vertical settlement and lateral deformation, and increasing overall stiffness. Reinforcement is achieved by the tensile forces that the geosynthetics develop under load, which contributes to the overall stability of the reinforced soil composite. Geotextiles and geogrids are the two geosynthetic products commonly used as reinforcement elements in a soil mass. In particular, the apertures within geogrids provide additional interlock embedded soil particles. Due to the increasing use of geosynthetics in geotechnical engineering for soil reinforcement, stabilisation and ground improvement, a deeper understanding of the interface and composite behaviour of geosynthetic-reinforced soils is required. The interface parameters, such as interface friction angle, adhesion and pull-out resistance, are essential for the design and stability analysis of geosynthetic-reinforced soil structures. The two commonly used experimental techniques to determine these interface parameters are large-scale direct/interface shear tests, and pull-out tests. However, the interaction mechanisms between soils and geosynthetics in these two testing modes remain poorly understood, as does the theory used to describe them. In particular, geogrids have complex and varying aperture shapes, sizes and thicknesses. The contribution of each shear strength component at the soil-geogrid interface has not been well established in the literature. To investigate the interface behaviour of geosyntheticreinforced soils, laboratory large-scale direct/interface shear and pull-out tests were carried out on different types of materials, including roadbase, crusher run aggregate, sand, and four types of geosynthetics. The applications of geosynthetics in base reinforcement and subgrade stabilisation were experimentally modelled in the large-scale interface shear tests. Theoretical frameworks were then proposed to interpret the experimental results by quantifying the contribution of different shear strength components mobilised along the interface between the soil and geogrid. Furthermore, the effects of scalping on the direct and interface shear strengths of aggregate were investigated. The particle breakage caused by loading and shearing in the direct and interface shear tests on aggregate with different degrees of scalping was assessed and discussed, based on sieving analyses and inferred particle breakage indices.

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Section: Stress Pathssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Interface and composite behaviour of geosynthetic-reinforced soils

Xu¹

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Undrained Behavior of Macau Marine Clay with Various Strain Rates and Different Stress Histories

Cited by 1 publication

References 5 publications

Interface and composite behaviour of geosynthetic-reinforced soils

Interface and composite behaviour of geosynthetic-reinforced soils

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