岩土力学Issue(z1)：195-202,8.
基于参数劣化的软硬相间顺层边坡稳定性研究
Study of stability of soft-hard interbedded slope based on degradation of strength parameters
摘要
Abstract
The Jurassic sand-mudstone alternating stratum is one of typical sliding-prone layers in Three Gorges Reservoir region, where the landslides occur with high frequency. Due to this characteristic lithology combination and architectural feature, the stratum is one key area of landslide control in Three Gorges Reservoir region. In order to further study the stability of rock slope with soft-hard alternating layers, the paper presents a new calculation model of soft-hard interbedding rock slope by means of the analysis on an idealized model. Besides, a shear strength parameter degradation model of soft-hard interbedded rock slope is proposed with considering the effect of weathering for shear strength parameter degradation of the discontinuity plane and a space variation function. Moreover, function expression of shear strength parameter degradation is educed along surface of the layer. The function presented the relationship between weathering thickness and strength parameters, which was in favour of the quantitative analysis of slope stability. Then, utilizing this function weakened the shear strength parameters along surface, evaluating slope stability with the weakened parameters, obtaining the relation curve of stability coefficient and distance from the analyzed point to slope surface. Finally, it is proved that the shear strength parameter degradation of the discontinuity plane of soft-hard interbedded rock slope is significant to its stability assessment with slope case study in Three Gorges Reservoir region. It is concluded that the assumption that shear strength parameters remain constant distribution along layer surface has certain limitation in the stability analysis of single sliding surface slope. Moreover, if the degradation of shear strength parameters of structural planes is not under consideration, it may lead to the result of stability calculation unsafe.关键词
岩质边坡/稳定性评价/软硬相间地层/变异函数/参数劣化Key words
rock slope/stability evaluation/soft-hard interbedding strata/variation function/degradation of parameters分类
建筑与水利引用本文复制引用
梁德明,李长冬,雍睿,王姣,胡斌..基于参数劣化的软硬相间顺层边坡稳定性研究[J].岩土力学,2014,(z1):195-202,8.基金项目
国家自然科学基金资助(No.41202198，No.41172281)；中央高校基本科研业务费专项资金“摇篮计划”资助(No. CUG130409，No. CUGL100413)；国家重点基础研究发展计划“973”项目资助(No.2011CB710604)；中国地质大学实验室开放基金资助(No. SKG2012141)。 （No.41202198，No.41172281）
