Abstract
Slip zone soil is usually composed of clay or silty clay; in some special geological environments, it contains gravels, which make the properties of the slip zone soil more complex. Unfortunately, in many indoor shear tests, gravels are removed to meet the demands of apparatus size, and the in situ mechanical property of the gravelly slip zone soil is rarely studied. In this study, the shear mechanical property of the gravelly slip zone soil of Huangtupo landslide in the Three Gorges Reservoir area of China was investigated by the in situ shear test. The test results show that the shear deformation process of the gravelly slip zone soil includes an elastic deformation stage, elastic–plastic deformation stage, and plastic deformation stage. Four functions were introduced to express the shear constitutive model of the gravelly slip zone soil, and the asymmetric sigmoid function was demonstrated to be the optimum one to describe the relationship of the shear stress and shear displacement with a correlation coefficient of 0.986. The comparison between the in situ test and indoor direct shear test indicates that gravels increase the strength of the slip zone soil. Therefore, the shear strength parameters of the gravelly slip zone soil obtained by the in situ test are more preferable for evaluating the stability of the landslide and designing the anti-slide structures.
Highlights
The shear mechanical properties of slip zone soil play a key role in the deformation and failure of landslides [1,2,3]
The objective of the study is to investigate the in situ shear mechanical properties using an in situ shear test apparatus
To investigate the mechanical property of the gravelly slip zone soil, a group of in situ shear tests were conducted in the sliding zone of the Huangtupo landslide, which is volumetrically the largest reservoir landslide in the Three Gorges Reservoir area, having a volume of approximately
Summary
The shear mechanical properties of slip zone soil play a key role in the deformation and failure of landslides [1,2,3]. The existence of gravel significantly changes the properties of the slip zone soil [7]; it is of great significance to investigate the shear mechanical properties of slip zone soil-containing gravels for evaluating the stability and analyzing the evolution process of the landslide. Landslides usually experience a process of large deformation [11]; the large shear displacement of the slip zone soil cannot be implemented in the direct shear test, and the ring shear test was thereby developed to study the shear mechanical properties of the slip zone soil with large displacement [12,13,14,15,16,17,18].
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