三峡水库蓄水将显著改变库岸的地质条件, 特别是库水的周期性涨落将极大地影响到滑坡体的稳定性, 由于防洪等需求, 目前库水位在175～145 m之间波动, 若滑坡在库水下降时遭遇到强降雨, 将可能失稳。树坪滑坡属巨型古堆积体滑坡, 距三峡大坝坝址约47 km, 若失稳将造成重大损失。应用ABAQUS软件对树坪滑坡进行库水下降联合降雨作用下三维流固耦合分析, 研究了树坪滑坡在几种工况下的变形及破坏规律, 并与监测结果进行对比。结果表明库水下降及降雨作用对树坪滑坡的稳定性有很大影响, 特别是在库水下降后期时遭遇到强降雨, 滑坡极易失稳。
Abstract
The impoundment of Three Gorges reservoir would remarkably change the hydrogeological conditions in the reservoir area. In particular, the periodic fluctuation of reservoir water level will greatly affect the stability of landslide. As a result of flood control requirements, the water level fluctuates between 145 m to 175 m, but if landslide encounters heavy rainfall when reservoir water declines, landslide instability would happen. Shuping landslide is a giant old accretions landslide about 47km away from the Three Gorges Dam, its instability would cause significant losses. Software ABAQUS was employed to research the three-dimensional coupling of seepage and stress of Shuping landslide under the combined action of water level decline and rainfall. The deformation and failure of Shuping landslide under several conditions were analyzed and were compared with monitoring results. Results show that reservoir water level decline combined with rainfall has great influence on Shuping landslide. The stress field of landslide together with the physico-mechanical properties of soil changes greatly. Heavy rainfall in the end of reservoir water decline would very much likely lead to landslide failure.
关键词
三峡库区 /
库水下降 /
流固耦合 /
滑坡监测
Key words
Three Gorges reservoir area /
reservoir water decline /
coupling of seepage and stress /
landslide monitoring
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参考文献
[1] 王 缓, 徐志英, 速宝玉.复杂裂隙岩体渗流与应力弹塑性全耦合分析[J].岩石力学与工程学报, 2000, 19(2):177-181. (WANG Yuan, XU Zhi-ying, SU Bao-yu. Complete Coupled Analysis of Fluid Flow and Elastoplastic Stress in Complicated Fractured Rock Masses[J]. Chinese Journal of Rock Mechanics and Engineering, 2000, 19(2):177-181. (in Chinese))
[2] 高海鹰, 夏颂佑.三维裂隙岩体渗流场与应力场耦合模型研究[J].岩土工程学报, 1997, 19(2):102-105.(GAO Hai-ying, XIA Song-you. Research on 3-D Model of Coupled Seepage and Stress Fields in Fracture Rock Mass[J]. Chinese Journal of Geotechnical Engineering, 1997, 19(2): 102-105. ( in Chinese))
[3] 仵彦卿, 柴军瑞.裂隙网络岩体三维渗流场与应力场祸合分析[J].西安理工大学学报, 2000, 16(1):1-5. (WU Yan-qing, CHAI Jun-rui. Analysis of 3-D Model of Coupled Seepage and Stress Fields in Fracture Network of Rock Mass[J]. Journal of Xi’an University of Technology, 2000, 16(1): 1-5. (in Chinese))
[4] 杨林德, 杨志锡.各向异性饱和土体的渗流耦合分析和数值模拟[J].岩石力学与工程学报, 2002, 21(10):1447-1451.(YANG Lin-de, YANG Zhi-xi. Coupling Analysis and Numeric Simulations on Seepage Flow in Anisotropic Saturated Soils[J]. Chinese Journal of Rock Mechanics and Engineering, 2002, 21(10):1447-1451. (in Chinese))
[5] 黄润秋, 许 强, 戚国庆.降雨及水库诱发滑坡的评价与预测[M].北京:科学出版社, 2007.(HUANG Run-qiu, XU Qiang, QI Guo-qing. Evaluation and Prediction of Landslide Induced by Rainfall and Reservoir[M]. Beijing: Science Press, 2007.(in Chinese))
[6] 王世梅, 郑 宏, 童富果.水库蓄水后三峡库区重大水库复活型滑坡空间预测评价研究[R].宜昌:三峡大学三峡库区地质灾害教育部重点实验室, 2013. (WANG Shi-mei, ZHENG Hong, TONG Fu-guo. Spatial Prediction Evaluation of Major Revived Landslides in Reservoir Area after the Impoundment of Three Gorges Reservoir[R].Yichang: Key Laboratory of Geological Hazards on Three Gorges Reservoir Area under Ministry of Education, China Three Gorges University, 2013.(in Chinese))
[7] 易 武, 尚 敏, 黄海峰, 等. 秭归谭家河滑坡地质模型研究报告[R]. 宜昌:三峡大学三峡库区地质灾害教育部重点实验室, 2010. (YI Wu, SHANG Min, HUANG Hai-feng, et al. Research Report of Geological Model for Tanjiahe Landslide in Zigui County[R].Yichang: Key Laboratory of Geological Hazards on Three Gorges Reservoir Area under Ministry of Education, China Three Gorges University, 2010. (in Chinese))
[8] 张 欣. 基于ABAQUS流固耦合理论的库岸滑坡稳定性分析[D].济南:山东大学, 2005. (ZHANG Xin. Stability Analysis of Reservoir Landslide Based on the ABAQUS Seepage-Stress Coupling Theory[D]. Jinan: Shandong University, 2005. (in Chinese))
[9] 费 康, 张建伟.ABAQUS在岩土工程中的应用[M].北京:中国水利水电出版社, 2010.(FEI Kang, ZHANG Jian-wei. Application of ABAQUS in Geotechnical Engineering[M]. Beijing: China Water Power Press, 2010.(in Chinese))
[10]张学年, 盛祝平.长江三峡工程库区顺层岸坡研究[M].北京:地震出版社, 1993. (ZHANG Xue-nian, SHENG Zhu-ping. Study on Layered Bank Slope along the Reservoir Area of the Yangtze River Three Gorges Project[M]. Beijing: Seismological Press, 1993. (in Chinese))
[11]杜荣桓, 刘新民.长江三峡工程库区滑坡与泥石流研究[M].成都:四川科学技术出版社, 1991. (DU Rong-huan, LIU Xin-min. Study on Landslides and Debris-flows in the Reservoir Area of the Three Gorges Project[M]. Chengdu: Sichuan Science and Technology Press, 1991. (in Chinese))
基金
国家自然科学基金资助项目(41372359);三峡大学研究生科研创新基金(2012CX023)
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