考虑水力作用的顺层岩质边坡稳定性图解分析  

Analysis of stability diagram of rock bedded slope under hydraulic pressure

作　　者：夏开宗[1] 陈从新[1] 鲁祖德[1] 宋娅芬[1] 周意超[1] 罗歆婷 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [2]贵州大学土木建筑工程学院,贵阳550033

出　　处：《岩土力学》2014年第10期2985-2993,3040,共10页Rock and Soil Mechanics

基　　金：西部交通科技项目(No.2009353342540);国家自然科学基金青年科学基金项目(No.41202225)

摘　　要：通过分析顺层岩质边坡中的水力作用,建立了出流缝未被堵塞和出流缝被堵塞两种情况下顺层岩质边坡的水力学模型;推导出了用无量纲参数(Q、P、S)形式表达的边坡稳定性安全系数Fs的表达式;绘制了边坡后缘张裂隙充满水后几何要素岩层倾角?、张裂缝高度Z/边坡高度H与无量纲参数(Q、P、S)的关系曲线,能为分析不同的边坡几何要素、水深、不同抗剪强度对边坡稳定性的影响提供方便。选取宜巴高速公路典型顺层岩质边坡进行研究,结果表明:对于出流缝未被堵塞的情况,水力作用使边坡稳定性安全系数降低程度为33.33%,是触发顺层岩质边坡滑移破坏的主要因素;出流缝被堵塞情况下边坡稳定性安全系数要比出流缝未被堵塞情况下约降低0.458。其研究成果对顺层岩质边坡工程设计和施工优化具有重要指导意义。By analyzing the effect of groundwater on rock bedded slope, the hydraulic pressure model of rock bedded slope in both cases that the outflow seam is blocked or not are established. Then the slope stability is presented and organized into a dimensionless （Q、P、S）form of expression;curve of relationship between geometric elements and dimensionless variables（Q、P、S）is drawn when the splay fracture in the tailing edge of slope is filled with water, which can bring convenience for analyzing the influence of different geometric elements, water depth, different shear strengths of rock mass on the stability of the slope. By using the relation curve, the effect mechanism of hydraulic pressure on actual bedding rock slope stability is discussed. It is shown that：the effect of hydraulic pressure on slope stability is considerably significant. For example, the safety factor is reduced by 33.33% owing to the effect of hydraulic pressure in the case of the outflow seam unblocked, which is the main external factors triggering the failure of bedding slope;and the safety factor on rock bedded slope in the case of the outflow seam is blocked reduced by about 0.458 than that the outflow seam isn＆#39;t blocked. The results can provide an important guide to engineering design and construction of rock bedded slope.

关 键 词：边坡工程 顺层岩质边坡 水力作用 稳定性图解 

分 类 号：TU457[建筑科学—岩土工程]