Failure behavior of soil-rock mixture slopes based on centrifuge model test Failure behavior of soil-rock mixture slopes based on centrifuge model test

最小化 最大化

Vol16 No.8: 1928-1942

Title】Failure behavior of soil-rock mixture slopes based on centrifuge model test

Author】WANG Teng; ZHANG Ga*

Addresses】State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China

Corresponding author】ZHANG Ga

Citation】Wang T, Zhang G (2019) Failure behavior of soil-rock mixture slopes based on centrifuge model test. Journal of Mountain Science 16(8). https://doi.org/10.1007/s11629-019-5423-x

DOI】https://doi.org/10.1007/s11629-019-5423-x

Abstract】The stability of soil-rock mixtures (SRMs) that widely distributed in slopes is of significant concern for slope safety evaluation and disaster prevention. The failure behavior of SRM slopes under surface loading conditions was investigated through a series of centrifuge model tests considering various volumetric gravel contents. The displacement field of the slope was determined with image-based displacement system to observe the deformation of the soil and the movement of the block during loading in the tests. The test results showed that the ultimate bearing capacity and the stiffness of SRM slopes increased evidently when the volumetric block content exceeded a threshold value. Moreover, there were more evident slips around the blocks in the SRM slope. The microscopic analysis of the block motion showed that the rotation of the blocks could aggravate the deformation localization to facilitate the development of the slip surface. The high correlation between the rotation of the key blocks and the slope failure indicated that the blocks became the dominant load-bearing medium that influenced the slope failure. The blocks in the sliding body formed a chain to bear the load and change the displacement distribution of the adjacent matrix sand through the block rotation.

Keywords】Soil rock mixture; Slope stability; Slope failure; Centrifuge model test