基于有限元强度折减法的多地层边坡支护模拟研究  

Simulation study of multi-stratum slope support based on finite element strength reduction method

作　　者：黄小平 蒋志坚 黄旭东 朱珍德[2] Huang Xiaoping;Jiang Zhijian;Huang Xudong;Zhu Zhende(Shenzhen Water Planning and Design Institute Co.,Ltd.,Water Engineering Institute,Shenzhen 528001,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]深圳市水务规划设计院股份有限公司水务工程院,广东深圳518001 [2]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210024

出　　处：《吉林水利》2024年第10期1-6,共6页Jilin Water Resources

基　　金：THM耦合过程中深埋岩石裂纹扩展演化规律与裂纹三维重构理论研究(国家自然科学基金面上项目,项目编号:51878249)。

摘　　要：为探究不同支护形式对多地层边坡开挖破坏的影响规律,依托贵州某复杂多地层溢洪道边坡工程,基于有限元强度折减理论,开展喷锚+预应力锚索以及锚杆+抗滑桩支护下的多地层边坡开挖模拟,对比模拟与现场监测结果。结果表明:采用锚杆+抗滑桩支护方案优于喷锚+预应力锚索支护方案,稳定安全系数由1.20提升至1.45;锚杆+抗滑桩支护后边坡整体位移从坡顶到坡脚逐渐减小;抗滑桩弯矩值和剪力值的最大值处均位于岩土体结构面或交界面处,锚杆的轴向力从坡顶到坡脚呈现先减小后增大趋势,最大轴向拉力约57.4 kN;采用锚杆+抗滑桩支护后,边坡现场位移监测数据变化速率逐渐减小,现场监测点的最大位移与数值模拟最大位移值基本吻合,证明数值模拟结果的可靠性。In order to explore the influence of different support forms on the excavation-induced failure of multi-layered slopes,basing on the complex multi-layered spillway slope project,finite element strength reduction theory is employed to conduct simulations of excavation under both anchored with prestressed anchor cables and anchored with anti-sliding piles support schemes.The simulation results are then compared with on-site monitoring data.The results indicate that the use of anchored with anti-sliding piles support scheme is better than the anchored with prestressed anchor cables support scheme,with the stability safety factor increasing from 1.20 to 1.45.After employing the anchored with anti-sliding piles support,the overall displacement of the slope gradually decreases from top to toe of the slope.The maximum values of bending moment and shear force of the anti-sliding piles are located at the rock-soil interface or junction,while the axial force of the anchors shows a trend of decreasing from the top to the toe of the slope,with a maximum axial tensile force of approximately 57.4 kN.After using the anchored with anti-sliding piles support,the rate of change of on-site displacement monitoring data gradually decreases,and the maximum displacement of on-site monitoring points is in good agreement with the maximum displacement value from numerical simulations,demonstrating the reliability of the numerical simulation results.

关 键 词：多地层边坡 边坡稳定性 组合支护方案 有限元强度折减法 数值模拟 

分 类 号：TU452[建筑科学—岩土工程]