某岩质边坡卸荷作用下分步开挖动态响应分析  

Dynamic Response Analysis of One Rock Slope Excavation by Steps Under Unloading

作　　者：肖志勇[1] 邓华锋[1] 黄强[1] 胡安龙[1] 李春波[1] 常德龙[1] 

机构地区：[1]三峡大学土木与建筑学院,443002

出　　处：《灾害与防治工程》2015年第1期23-28,共6页Disaster and Control Engineering

基　　金：水利部公益性行业科研专项经费项目（201401029）;国家自然科学基金资助项目（51279091）;三峡大学研究生科研创新基金项目（2014CX016）

摘　　要：岩质边坡在分步开挖的过程中，边坡应力和变形会相应地发生动态变化，每一步开挖会对边坡产生不同程度的影响。本文通过模拟某水电站放空洞进水口岩质边坡的开挖，以水平向相对应力变化率进行了分析。研究结果表明：随着边坡分步开挖的进行，边坡内部应力因开挖距离的变化，发生不同阶段的演化，在距开挖距离为一20％～10％，应力变化剧烈，不利于边坡稳定。以此，边坡开挖和加固设计应合理适时地进行，避免不必要的灾害发生。In the process of rock slope excavation by steps, the stresses and deformation of the slope will correspondingly experience a dynamic change process. Each step of the exca- vation will generate different influence. To study the influence, this paper simulates the rock slope excavation of one hydropower station＇s emptying tunnel intake. The horizontal relative stress varied value rate is analyzed under each step excavation. The results show that the stresses inside the slope varies at different stages with the changes of excavation distance. Distance from the excavation by -20% - 10 %, The stresses vary dramatically, which brings no benefit to the stability of the slope. So by this, the excavation and strengthening design of the slope should be done reasonably and duly, to avoid unnecessary disasters.

关 键 词：岩质边坡 开挖 应力 加固设计 

分 类 号：TU470.1[建筑科学—结构工程]