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为考察片岩残积土的剪切特性,结合鄂西北山区某边坡工程,开展了风化岩残积土大型原位直剪试验,研究了风化岩残积土的结构组成、剪切面破损特性、剪切强度特性及其含石率、起伏度等相关关系。结果表明:该风化岩残积土应力-应变曲线多呈应变硬化特征,无明显峰值;束状孤石和束状石组多为翻滚和啃断破坏,起伏度随含石率的增大而增大,近似呈线性关系;爬坡效应会引起剪胀,造成剪应力和垂直应力的增大;随着垂直应力的增大,剪切破坏机制逐渐由滑移破坏变为啃断破坏,剪压应力比(剪应力与垂直应力的比值)逐渐减小。研究成果可为边坡工程变形及稳定性分析提供参考。
In order to investigate the shear characteristics of residual schist and to study a large-scale direct shear test of weathered residual rock in combination with a slope project in the mountainous area of northwestern Hubei Province, the structure, composition, Strength characteristics and the stone containing rate, fluctuation and other related. The results show that the stress-strain curve of the remnant of weathered rock is mostly characterized by strain hardening with no obvious peak value. Most of the boulders and bundles are tumbling and nibbling failure, and the undulating degree increases with the increase of rock content , Which is approximately linear. Climbing effect will cause dilatancy, resulting in the increase of shear stress and vertical stress. As the vertical stress increases, the shear failure mechanism gradually changes from slip failure to nibbling failure and shear stress Ratio (ratio of shear stress to vertical stress) decreases gradually. The research results can provide reference for the deformation and stability analysis of slope engineering.