1. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China; 2. Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-rock Dam of the Ministry of Water Resources, Nanjing 210024, China
Abstract：The revetment structure can reduce the damage of soil bank slopes caused by water erosion, but its influences on the physical and mechanical processes such as seepage and deformation of the existing bank slopes should be fully considered in practice. Taking Xinmeng River extension project as the prototype, the influences of the revetment structure with clay on the seepage characteristics and stability of bank slopes are analyzed by the fluid-solid coupling finite element method. The calculated results show that when the clay slope is selected as the revetment form in the high water level area, the phenomenon of "lateral seepage" is likely to occur around the revetment structure. However, there is a hidden danger of seepage failure in the low water level area. Meanwhile, the safety factor of slope decreases due to the increase of local seepage force. In view of the unfavorable factors of the revetment structure with clay, numerical calculations are performed to further optimize the revetment structure with clay. Adding bagged gravel foot protection to the revetment structure of clay bank slope can effectively reduce the velocity in the clay slope layer and the local permeability of the slope surface. Setting up lateral drainage pipes on the revetment structure of slope in the clay-encrusted bank can improve the long-term stability of the bank slope.
[1] 关春曼, 张桂荣, 程大鹏, 等. 中小河流生态护岸技术发展趋势与热点问题[J].水利水运工程学报, 2014(4): 75-81. (GUAN Man-chun, ZHANG Gui-rong, CHENG Da-peng, et al.Development trends and the hot topics of ecological revetment technology for medium and small rivers[J]. Hydro-Science and Engineering, 2014(4): 75-81. (in Chinese)) [2] THOMPSON D M.Long-term effect of instream habitat-improvement structures on channel morphology along the blackledge and Salmon Rivers, Connecticut, USA[J]. Environmental Management, 2002, 29(2): 250-265. [3] 张幸农, 陈长英, 应强, 等. 渐进式崩岸基本特征及其形成原因[J]. 泥沙研究, 2012(3): 46-50. (ZHANG Xing-nong, CHEN Chang-ying, YING Qiang, et al.Basic characteristics and cause of gradual riverbank caving[J]. Journal of Sediment Research, 2012(3): 46-50. (in Chinese)) [4] 朱海生, 陈健, 张桂荣, 等. 生态袋挡墙护岸结构设计及其力学性能变化[J]. 水利水运工程学报, 2015(4): 48-55. (ZHU Hai-sheng, CHEN Jian, ZHANG Gui-rong, et al.Structural design of retaining wall with ecological geo-textile bags and its changes in mechanical properties[J]. Hydro-Science and Engineering, 2015(4): 48-55. (in Chinese)) [5] 雷国辉, 郑强. 瑞典条分法剖析引发的有效应力和渗流力概念问题[J]. 岩土工程学报, 2012, 34(4): 667-676. (LEI Guo-hui, ZHENG Qiang.Issues on concepts of effective stress and seepage force arising from anatomizing Swedish slice method[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(4): 667-676. (in Chinese)) [6] 陈曦, 刘春杰. 逐步完善的非饱和土边坡稳定性有限元分析方法[J]. 岩土工程学报, 2011, 33(增刊1): 387-391. (CHEN Xi, LIU Chun-jie.Staged development of finite element methods for stability of unsaturated soil slopes[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(S1): 387-391. (in Chinese)) [7] 水利水电工程地质勘查规范:GB50487—2008[S]. 2008. (Code for Engineering Geological Investigation of Water Resources and Hydropower: GB50487—2008[S]. 2008. (in Chinese))
