摘要
针对岩质节理边坡,采用UDEC离散单元法中水力全耦合分析模型,研究了地下水位变化时,在渗流-应力耦合作用下,边坡应力、渗流变化的过程以及渗流作用下边坡的位移分布和破坏形式。研究结果表明:随着地下水位的升高,主应力迹线发生偏转的范围增大,相应的最大主应力增大;水位的升高导致节理张开度增大,进而坡内节理中的渗流流量增大,最大孔隙水压力呈线性增大;渗流作用下,位移等值线沿节理呈块状分布,当岩质节理边坡应力与渗流不能平衡时,坡面上节理切割形成的三角形块体在重力和孔隙水压力作用下顺坡面向下滑,边坡发生破坏。
The hydro-mechanical model based on the discrete element method in UDEC software was utilized to discuss the chanfe of stress and seepafe,displacement distribution and failure of fractured rock slope subJected to the fluctuation of water level. The results show that the scope of the main stress trace deflection develops and the correspondinf maximum principal stress increases with the risinf of underfround water level. And the Joints openinf caused by the risinf of water level leads to seepafe flow,flow speed and the maximum pore water pressure increasinf. The displacement develops alonf Joints and the trianfular rock block on the surface of the slope formed by Joints fall down finally under the effect of fravity and pore water pressure when the Joint rock mass slope stress and seepafe can not balance.
出处
《人民黄河》
CAS
北大核心
2014年第6期126-128,共3页
Yellow River
基金
国家自然科学基金资助项目(41372329)
国家重点基础研究发展计划项目(2011CBD13500
2011CBD13504)
关键词
岩质边坡
节理
渗流
稳定性
离散单元
rock slope
Joints
seepafe
stability
discrete element method
