阮浩东 郑晓东 付建宝 沈一鸣 赵逸博

摘 要：【目的】为研究降雨入渗对多级开挖支护后高边坡的稳定性，针对四川达州市某高边坡工程，基于ABAQUS软件并结合现场工程地质和水文地质条件，建立高边坡开挖降雨渗流模型。【方法】考虑不同降雨条件的影响，引入多层非饱和土计算方法，结合现场监测情况，对降雨工况进行研究，进而研究非饱和土边坡的稳定性。【结果】研究结果表明，孔隙水压、边坡位移与降雨强度和降雨持续时间呈正相关，长时间高强度降雨易使多级开挖的高边坡产生较大滑移。【结论】建议采取边开挖边支护的施工措施。研究成果可为高边坡多级开挖支护的稳定性研究提供一定的参考。

关键词：高边坡；稳定性分析；降雨入渗；多层非饱和土；现场监测；数值模拟

中图分类号：U416.1     文献标志码：A     文章编号：1003-5168（2024）08-0054-06

DOI：10.19968/j.cnki.hnkj.1003-5168.2024.08.011

Analysis of High Slope Excavation Support Stability Considering

Rainfall Infiltration

RUAN Haodong1，2，3 ZHENG Xiaodong1，2 FU Jianbao3，4，5，6 SHEN Yiming1，2 ZHAO Yibo1，2，3

（1.College of Water Resources and Hydropower， Hebei University of Engineering， Handan 056001， China;

2.Hebei Key Laboratory of Intelligent Water Conservancy， Hebei University of Engineering， Handan 056038， China; 3.CCCC Tianjin Port Engineering Institute Co.， Ltd.， Tianjin 300222， China; 4. Key Laboratory of Geotechnical Engineering of Ministry of Communications， Tianjin 300222， China; 5. Key Laboratory of Geotechnical Engineering of Tianjin， Tianjin 300222， China; 6.Tianjin Key Laboratory of Port Geotechnical Engineering Technology， Tianjin 300222， China）

Abstract： [Purposes] In order to study the stability of the high slope after multi-stage excavation and support， a high slope project in Dazhou City， Sichuan Province was established based on ABAQUS software and combined with the site engineering geology and hydrogeological conditions. [Methods] Considering the influence of different rainfall conditions， the calculation method of multilayer unsaturated soil is introduced， and combined with the field monitoring， the rainfall condition is studied， and the stability of unsaturated soil slope is summarized. [Findings] The results show that the pore water pressure and slope displacement are positively correlated with rainfall intensity and rainfall duration， and long-term high intensity rainfall is prone to large slip in multi-stage excavated high slope. [Conclusions] It is suggested to take the construction measures of excavation and support. The results can provide some theoretical reference for the stability research of multi-stage excavation support of high slope.

Keywords： high slope; stability analysis; rainfall infiltration; multi-layer unsaturated soil; field monitoring; numerical simulation

0 引言

近年来，人工边坡的高度和面积逐渐增加，加上复杂多变的工程地质条件和降雨等特殊工况，由降雨入渗造成的边坡失稳和破坏情况并不少见。如陈家湾沟滑坡［1］、云南红河滑坡均揭示了降雨入渗是导致非饱和土边坡失稳的主要因素之一［2-3］。

对于降雨工况下边坡稳定性的研究方式主要包括数值建模和试验。孔郁斐等［4］分析了降雨入渗对边坡稳定性的影响，进行了有限元模拟计算。李焕强等［5］研究了不同因素对边坡稳定性的影响，得出了降雨入渗条件下土体含水率的变化规律。史振宁等［6］通过试验并结合非饱和土抗剪强度理论及极限平衡理论，得到降雨入渗条件下土质边坡浅层稳定性的计算方法。……