基于改进水压分布下临河岩质边坡倾覆稳定性分析  

Analysis of Overturning Stability of Rock Slope along River Based on Improved Water Pressure Distribution

作　　者：刘富有[1,2] 师华鹏 余宏明[1] 陈鹏宇[1,3] 

机构地区：[1]中国地质大学(武汉)工程学院,武汉430074 [2]河南省地质矿产勘查开发局第二地质矿产调查院,郑州450000 [3]内江师范学院地理与资源科学学院,内江641100

出　　处：《科学技术与工程》2016年第1期141-146,161,共7页Science Technology and Engineering

基　　金：国家自然科学基金(41272377)资助

摘　　要：基于改进的水压分布假设,建立了临河岩质边坡在坡顶荷载、地震作用、冻胀作用、锚固效应、静水压力和流水淘蚀等多因素影响下失稳的概化理论模型,并利用极限平衡理论推导出了临河岩质边坡倾覆稳定性的一般表达式。重点分析了各影响因素对边坡倾覆稳定性的影响。算例分析表明:出流缝未堵塞边坡的倾覆稳定性随着临河水位的升高先减小后增大,而出流缝堵塞边坡的倾覆稳定性仅随临河水位的升高而增大;而且,kh越大、kV越小、流水淘蚀和冰雪冻胀作用越强,对边坡倾覆稳定性就越不利,但边坡超载、增大锚固力和锚固位置的同时以最优的锚固角设置锚杆(索)有利于边坡的稳定。Based on the assumption of improved groundwater pressure distribution,a model of rock slope instability generalizability theory along river under the multiple factors of top load,seismic action,frost heaving,anchoring effect,hydrostatic pressure and stream erosion at the slope is established,and the calculation formula of overturning stability factor of rock slope along river is derived by using limit equilibrium method. The model focuses on the influence of various factors on overturning stability of rock slope along river. The calculation example analysis shows that： as the water level gets higher,the overturning stability of slope where outflow seam is unblocked first decreases and then increases,while the overturning stability of slope where outflow seam is blocked only increases.And if khincreases,kVdecreases,the effect of water scour and snow and ice frost heave gets enhanced,it will be bad for overturning stability of slope; however,if slope gets overloaded,the anchoring force increases and anchoring position can be kept well by setting anchor rod with the optimal anchoring angle,it can benefit the overturning stability of slope.

关 键 词：临河岩质边坡 极限平衡法 倾覆稳定性 水压分布 流水淘蚀 

分 类 号：U416.4[交通运输工程—道路与铁道工程]