川西顺层斜坡破坏模式及层间弱面连通率对斜坡稳定性的影响

Failure Modes and Influence of Interlaminar Fracture Zone Connectivity on Slope Stability of Bedding Rock Slope in Ya’an,West Sichuan

顺层岩质斜坡是沉积岩地区常见的一种斜坡类型,也是各种工程建设重点关注的一类斜坡。以川西雅安地区典型的顺层岩质斜坡为例,采用现场调查、无人机测绘、钻探、物探和稳定性计算等技术方法,归纳总结目前斜坡存在的变形破坏模式。分析计算斜坡在不同工况条件下,层间破碎带连通率与斜坡稳定性之间的关系。研究结果表明:层间破碎带对斜坡稳定性具有重要的影响或控制作用,当斜坡浅表部强风化岩体内层间破碎带连通率小于86%时,斜坡稳定性与现状调查结果吻合。研究结果对川西地区基础设施规划建设和防灾减灾具有重要的工程意义。

Bedding rock slope is a common slope type in sedimentary rock areas,and is a slope-type that is focused on by various engineering construction.Taking a typical bedding rock slope in Ya’an area of west Sichuan as an example,the deformation and failure modes of the slope are summarized by field investigation,UAV mapping,drilling,geophysical exploration,stability calculation and other technical methods.The relation between the connectivity of interlaminar fracture zone and slope stability under different conditions is analyzed and calculated.The results show that:the interlaminar fracture zone has an important influence/control on slope stability.When the connectivity of the interlaminar fracture zone in the shallow part of the slope is less than 86%,the slope stability is consistent with the current investigation results.This provides a new idea to analyze the extension length or connectivity of interlaminar fracture zone of layered rock bodies.The research results have important engineering significance for infrastructure planning and construction,as well as for disaster prevention and mitigation in west Sichuan.