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滑带土的强度特性对于边坡稳定具有重要的控制作用,揭示滑带土强度指标的变化规律是进行边坡安全性评估的基本前提。针对一库岸古滑坡滑动带中的含粗粒细粒土,进行了滑带土强度特性的试验研究:通过现场大剪试验和室内固结快剪试验分析了滑带土的剪切性状,确定了再生强度、现场折减强度和固结快剪强度;根据现行反复剪切试验在确定含粗粒细粒土残余强度时的不足,对试验方法和试验仪器进行了改进,提出了滑带土的残余强度指标,并与其他剪切条件下的强度指标进行了比较;基于试验结果的统计分析,探讨了土体含水率、塑性指数及粗粒含量对剪切强度指标的影响,并总结了含粗粒细粒土与一般黏性土或砂土在剪切性状方面的诸多不同。
The strength characteristics of sliding zone soil have an important role in controlling the slope stability. It is a basic prerequisite for slope safety assessment to reveal the variation law of strength index of sliding zone soil. Aiming at the coarse-grained fine-grained soil in the slide belt of a bank ancient landslide, the test of the strength characteristics of the slip-soil is carried out. The shear properties of the slip-soil are analyzed by on-site large shear tests and quick- According to the current repeated shear test in determining the residual strength of coarse coarse grained soil, the test methods and test equipment were improved, and the sliding band Soil residual strength index and compared with other shear strength indicators; based on the statistical analysis of test results, the effect of soil moisture content, plasticity index and coarse content on shear strength index was discussed and summarized A lot of differences between the coarse-grained fine-grained soil and the general cohesive soil or sand in the shear properties.