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.
出处
《科学技术与工程》
北大核心
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
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
rock slope along river
limit equilibrium method
overturning stability
water pressure distribution
stream erosion
