罕遇地震作用下锚索抗滑桩加固边坡的抗震性能

Seismic Performance of Anchor Cable Anti-slip Pile Reinforced Slopes under Rare Earthquakes

介绍了露天煤矿开采存在潜在的滑坡危险及治理方法的研究概况。设计了一种预应力锚索抗滑桩加固露天煤矿边坡土体的加固方案,建立了加固后露天煤矿边坡土体的三维数值模型。主要研究了罕遇地震作用下锚索抗滑桩加固边坡的抗震性能,对比分析了锚索在不同预应力及倾角下加固边坡代表性截面处加速度响应、坡体位移、动土压力及抗滑桩弯矩的变化规律。结果表明,随着预应力的增大和倾角的减小桩体弯矩均呈现“S”形分布;同时,会出现“土拱效应”,使得桩后动土压力、加速度放大效应均随高程的增加呈现出先增后减的趋势。研究成果可直接应用于露天煤矿边坡的治理和加固。

An overview of the research on the potential landslide hazards and management methods of open-pit coal mining is presented.A reinforcement scheme of prestressed anchor cable anti-slip pile reinforced slope soil of open-pit coal mine is designed,and a three-dimensional numerical model of the reinforced slope soil of open-pit coal mine is established.The seismic performance of the slope reinforced by anchor cable anti-slip piles under the action of rare earthquakes is mainly studied,and the changes of acceleration response,slope displacement,dynamic soil pressure and anti-slip pile bending moment at the representative section of the reinforced slope with different prestressing force and inclination angle of anchor cable are compared and analyzed.The results show that with the increase of prestressing force and the decrease of inclination angle,the pile bending moment shows an"S"shape distribution;at the same time,the"soil arch effect"occurs,which makes the dynamic soil pressure and acceleration amplification effect behind the pile show a trend of increasing and then decreasing with the increase of elevation.The research results can be directly applied to the treatment and reinforcement of the slope of open pit coal mine.