顺层软弱夹层影响下的边坡稳定性分析与加固研究  

Stability analysis and reinforcement design of slopes under the influence of bedding weak interlayers

作　　者：郑晋溪 ZHENG Jinxi

机构地区：[1]福建省建筑科学研究院有限责任公司、福建省绿色建筑技术重点实验室,福建福州350108

出　　处：《福建建设科技》2025年第2期40-43,共4页Fujian Construction Science & Technology

基　　金：福厦泉国家自主创新示范区滨海地下工程群抗浮关键技术研发与产业化协同创新平台项目(3502ZCQXT2022002)。

摘　　要：本研究针对含软弱夹层边坡的失稳问题,以某一级公路高边坡为研究对象,利用3DEC离散元数值模拟软件构建含软弱夹层的三维仿真边坡模型,对比分析了含软弱夹层与无软弱夹层边坡的稳定性及塑性区域分布。研究结果表明,无软弱夹层时,安全系数为1.172;受软弱夹层影响,安全系数降至1.020,剪切塑性区体积减小。软弱夹层导致潜在滑动主要沿夹层滑动,在坡脚形成潜在滑面。基于此,设计了抗滑桩加固方案,针对关键剪切塑性区进行加固,有效抵抗沿夹层的滑动。加固后数值模拟显示,安全系数提升至1.3以上,有效控制了剪切塑性区扩展及坡顶滑移。现场监测表明,坡脚开挖及持续降雨两种工况会诱发边坡水平位移量增加,抗滑桩对含软弱夹层边坡加固效果良好。研究成果为含软弱夹层边坡的稳定性分析提供了重要的实践指导和理论依据。Weak intercalation is one of the important factors affecting the stability of slope.In order to solve the problem of slope instability of bedding weak intercalation,a three-dimensional simulation slope model with weak intercalation was constructed by taking a high slope of a first-class highway as the research object and using the discrete element numerical simulation software.The research results show that under typical slope conditions,the safety factor without weak interlayers is 1.172,and the safety factor is reduced to 1.020 due to the influence of weak interlayers.The volume of the shear plastic zone of the weak interlayered slope is smaller than that without weak interlayers;Compared to the circular potential sliding surface of slopes without weak interlayers,the potential sliding body of the slope mainly slides along the weak interlayers and forms a potential sliding surface with the foot of the slope due to the influence of the weak interlayers.Based on this,this article designs a anti-skid pile reinforcement support scheme,which focuses on strengthening the key parts of the shear plastic zone,effectively resisting the sliding tendency along the interlayer.After the implementation of support measures,the safety factor of the slope was successfully increased to above 1.3,effectively controlling the expansion of shear plastic zone and slope top sliding.The in-situ monitoring of deep horizontal displacement data shows that slope foot excavation and continuous rainfall are the main factors leading to the development of slope horizontal displacement,and the anti-slide pile has a good effect on strengthening the soft interlayer slope.The research results provide important practical guidance and theoretical basis for the stability analysis of bedding weak interlayer slopes.

关 键 词：顺层 软弱夹层 边坡稳定性分析 数值分析 边坡加固 

分 类 号：TU43[建筑科学—岩土工程]