Strength and deformation characteristic of soil-rock mixture and settlement prediction in high filled projects
YANG Xiaohui1，2，ZHU Yanpeng1，2，GUO Nan1，2
(1. School of Civil Engineering，Lanzhou University of Technology，Lanzhou，Gansu 730050，China；2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education，Lanzhou University of Technology，
Lanzhou，Gansu 730050，China)
Abstract：Shear tests and compression tests were carried out for soil samples of different initial water contents and initial dry densities in order to investigate the strength and deformation of soil-rock mixture in high filled projects. The shear strength and deformation of different soil-rock ratios varying with initial parameters were analyzed in detail. The smaller the initial degree of compaction is，the larger the confined compression strain of the specimen is. The larger the initial water content is，the larger the confined compression strain of the specimen is. The compression coefficient increases firstly and then decreases with increasing the vertical pressure. The compression modulus increases with rising the vertical pressure. The initial degree of compaction in the similar hill filled projects should be controlled to be more than 0.93，the initial water content should be controlled around the optimum water content within 2% to 3% of error，and the soil-rock ratio should be controlled between 2∶8 and 4∶6. The relationship between the dry density of the compacted mixture of silty clay and sandy mudstone and the vertical pressure is a power function. An algorithm was established to predict the strength and settlement according to the initial state and the loads of filled soil layer. The difference of settlement caused by the different compaction coefficient in the range of optimum water content is small. The settlement and deformation of foundation decrease obviously with the increase of compaction coefficient. The influence of compactness on the settlement of foundation when the ratio of soil to rock is 2∶8 is greater than when the ratio of soil to rock is 4∶6.
杨校辉1，2，朱彦鹏1，2，郭 楠1，2 . 高填方土石混合料强度与变形特性及沉降预测研究[J]. 岩石力学与工程学报, 2017, 36(7): 1780-1790.
YANG Xiaohui1，2，ZHU Yanpeng1，2，GUO Nan1，2. Strength and deformation characteristic of soil-rock mixture and settlement prediction in high filled projects. , 2017, 36(7): 1780-1790.
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2017, Vol. 36 
