复杂路堑高边坡施工期多次滑动机理分析与讨论  

Analysis and discussion on the mechanism of multiple sliding for cutting high slope during construction

作　　者：王浩[1] 王明哲 陈秀晖 泮俊 WANG Hao WANG Mingzhe CHEN Xiuhui PAN Jun(College of Environment and Resources, Fuzhou University, Fuzhou, Fujian 350116, China China Highway Engineering Consulting Corporation, Zhong Zi Hua Ke Traffic Construction Technology Co., Ltd, Beijing 100195, China)

机构地区：[1]福州大学环境与资源学院资源与城乡建设系,福建福州350116 [2]中国公路工程咨询集团有限公司中咨华科交通建设技术有限公司,北京100195

出　　处：《中国地质灾害与防治学报》2016年第3期14-21,共8页The Chinese Journal of Geological Hazard and Control

基　　金：福建省自然科学基金(2013J01159);交通运输部建设科技项目(201331849A130);福建省交通运输科技发展项目(201242)

摘　　要：工程开挖及降雨等因素诱发高边坡在施工过程中产生多次滑动,由"小变形"演变为"大灾害",充分体现滑坡成因的复杂性、多样性,以及滑坡防治方案比选、优化及实施过程中面临的困难。本文依托典型路堑高边坡病害防治案例研究,首先,概要介绍了边坡工程地质模型、先后产生3次滑动的变形破坏特征,以及相应阶段的工程控制对策;然后,采用节理有限元法模拟在工程开挖及地下水位变化条件下边坡渐进变形破坏演化过程,分析多次滑动的成因及降雨触滑机制;最后,从破坏模式预测与修正、失稳因素识别与控制、支护方案比选与调整、施工时机选择与规避、工程质量管理与控制等方面讨论了该滑坡治理的经验与教训。研究指出:工程开挖阶段是边坡处于欠稳定状态的敏感时期,在此期间遭遇反复降雨抬升地下水位,将使边坡稳定性骤降,进而演化为多次累进式滑动变形。滑坡防治是包含边坡稳态的定性判断、定量计算和动态评估,有针对性的优选滑坡防治方案,合理规划治理方案实施时机与过程,严格管理和监控工程质量的系统性工程风险调控过程。Slide of cutting high slope was frequently induced by rainfall during excavation,which gradually turned the small deformation of slope to large hazard. It embodies the complexity,diversity of landslide mechanism,the difficulty in selection,optimization and implementation of control scheme. Based on the case analysis of disaster control to typical cutting high slope,this paper summarily introduced the engineering geological model of slope,the characteristics of deformation and failure of triple sliding,and the corresponding measures. The evolutionary process of progressive deformation and failure inside slope under the condition of excavation and water level variation were simulated using finite element method. The causes of sliding and triggering mechanism by rainfall were analyzed. Finally,the experiences and lessons of landslide control was concluded,as the forecast and fix of failure mode,identification and control of unstable factor,optimization and adjustment of supporting measures,selection and avoidance of construction occasion,management and control of engineering quality were discussed. It was summarized that engineering excavation stage was asensitive condition of the slope instability, groundwater level rasing caused by continuous rainfall simultaneously decreased the stability of slope,which resulted into frequent progressive sliding deformation.Landslide control is a systematic process of engineering risk regulation which consists of qualitative judgment,quantitative calculation and dynamic assessment of slope stability,targeted optimization of landslide control schemes,reasonable plan in occasion and process of treatment,strict management and monitor of engineering quality.

关 键 词：路堑高边坡 降雨 滑坡 滑坡成因 滑坡防治 

分 类 号：TU42[建筑科学—岩土工程]