摘要
[目的]研究糯扎渡水电站滑坡体非饱和土的基质吸力,为运用非饱和土力学理论研究滑坡判据提供参考.[方法]运用快拔式张力计选取在岩性上具有代表性的5处滑坡(典型强风化砂岩、页岩,典型全强风化花岗片麻岩,典型全风化粉砂岩,典型全风化花岗岩,典型全风化花岗岩)进行现场观测试验,对比不同岩性岩石在天然状态和模拟饱和状态下的基质吸力变化曲线.[结果]不同岩性对于基质吸力的降低呈现不同的变化曲线,基质吸力的降低以全强风化花岗片麻岩最明显,全风化花岗岩次之,全强风化粉砂岩变化相对最小.[结论]滑坡体含水率对其强度的影响显著.
Abstract
[Objective] The aim was to study matrix suction of unsaturated soil of Nuozhadu Hydropower Station and provide reference for using unsaturated soil mechanics to study landslide.[Method] Quick pull type tensiometer was used to select 5 representative landslides(typical strong weathered sandstone,shale; typical strong weathered granite gneiss; typical weathered siltstone; typical weathered granite; typical weathered granite) to conduct field observation test,the change curve of matrix suction of different lithology rock in the natural state and saturated condition was compared.[Result] The order of reduction of matrix suction was typical strong weathered granite gneiss ＞ typical weathered granite ＞ typical strong weathered siltstone.[Conclusion] The effect of water content on the strength of landslide is remarkable.
基金项目
云南高原岩溶区红土成因及环境演化信息研究项目(2013FA033)
国家科技期刊平台
NSTL
维普
万方数据