王世梅, 潘宇晨, 王力, 等. 2021. 三峡库区大坪滑坡变形对前缘塌岸的响应分析[J]. 工程地质学报, 29(3): 647-656. doi: 10.13544/j.cnki.jeg.2021-0194.
    引用本文: 王世梅, 潘宇晨, 王力, 等. 2021. 三峡库区大坪滑坡变形对前缘塌岸的响应分析[J]. 工程地质学报, 29(3): 647-656. doi: 10.13544/j.cnki.jeg.2021-0194.
    Wang Shimei, Pan Yuchen, Wang Li, et al. 2021. Response analysis of landslide deformation to front bank collapse of Daping landslide in Three GorgesReservoir area[J]. Journal of Engineering Geology, 29(3): 647-656. doi: 10.13544/j.cnki.jeg.2021-0194.
    Citation: Wang Shimei, Pan Yuchen, Wang Li, et al. 2021. Response analysis of landslide deformation to front bank collapse of Daping landslide in Three GorgesReservoir area[J]. Journal of Engineering Geology, 29(3): 647-656. doi: 10.13544/j.cnki.jeg.2021-0194.

    三峡库区大坪滑坡变形对前缘塌岸的响应分析

    RESPONSE ANALYSIS OF LANDSLIDE DEFORMATION TO FRONT BANK COLLAPSE OF DAPING LANDSLIDE IN THREE GORGES RESERVOIR AREA

    • 摘要: 随着三峡水库的长期运行,受库水位涨落和波浪作用影响,三峡水库土质岸坡的塌岸问题愈发严重,塌岸不仅造成了水土流失,甚至会诱发滑坡复活。大坪滑坡是三峡库区前缘塌岸发育最为明显的滑坡之一,以三峡库区大坪滑坡为例,结合大坪滑坡的地表宏观变形、地表GPS位移等数据,分析滑坡变形特征以及塌岸对滑坡变形的影响,在此基础上通过ABAQUS生死单元功能实现前缘塌岸对滑坡稳定性影响的数值模拟,进一步探索滑坡变形对前缘塌岸的响应关系。结果表明:大坪滑坡的变形主要受库水位涨落影响,前缘塌岸较发育,塌岸一侧GPS监测点地表位移变化较明显,显然塌岸对大坪滑坡地表变形影响较大;ABAQUS的有限元计算结果表明,塌岸对滑坡的变形影响十分明显,影响大小主要与塌岸方量相关;塌岸导致的滑坡变形主要集中在滑坡前部,并向后部逐渐扩展;ABAQUS中的生死单元法可以很好地实现塌岸对滑坡稳定性影响的模拟。

       

      Abstract: With the long-term operation of the Three Gorges Reservoir, owing to the fluctuation of water level and wave action, the bank collapse in the Three Gorges Reservoir area becomes more and more evident. Bank collapse not only causes soil loss, but also induces the landslide occurrence. Daping landslide is one of the landslides in Three Gorges Reservoir area. Its bank collapse development is serious. This paper combines the surface deformation with GPS displacement data of Daping landslide. It analyzes the characteristics of landslide deformation and the impact of bank collapse on landslide deformation. On this basis, it uses the model change method to realize the numerical simulation of the influence of the front bank collapse on the stability of the landslide, and further explores the response relationship of the landslide deformation to the front bank collapse. The results show the follows. The deformation of Daping landslide is mainly affected by the fluctuation of the reservoir water level. The bank collapse of the front edge is relatively developed. The surface displacement of GPS monitoring point on the side of the bank collapse has evident changes. Evidently, the bank collapse has a greater impact on the surface deformation of Daping landslide. The ABAQUS finite element calculation results show that the bank collapse has a significant impact on the landslide deformation, and the impact magnitude is mainly related to the amount of bank collapse. The landslide deformation caused by bank collapse is mainly concentrated in the front part of the landslide and gradually expands to the rear part. The model change method in ABAQUS can well simulate the influence of bank collapse on the landslide stability.

       

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