蓄水期边坡及地基变形对高拱坝的影响

doi:10.13722/j.cnki.jrme.2014.0860

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摘要在高拱坝施工期和运行期，蓄水引起的边坡和地基变形是值得关注的问题。蓄水对岩体产生许多影响，包括岩体参数弱化、有效应力降低和浮托力的作用。这些现象与滑坡、坝体稳定和水库诱发地震等工程问题相关，而目前对蓄水作用的力学机制的研究仍十分有限。将边坡极限分析中的强度折减法扩展为同时考虑刚度和强度折减的有限元方法，并用于分析岩体材料的弱化。将裂隙岩体的有效应力原理应用到Drucker-Prager准则。基于锦屏一级拱坝左岸边坡变位和谷幅收缩的监测数据，将上述2种方法应用于蓄水期边坡及地基变形影响分析。结果表明，坝体具有良好的承受边坡变形的能力，仅在局部有变形和应力改变。

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	杨强
	潘元炜
	程立
	刘耀儒

关键词 ：边坡工程, 蓄水, 高拱坝, 有效应力, 强度折减

Abstract：Impounding deformation of slope and foundation is a noteworthy problem during construction and operation periods of high arch dams. Reservoir impoundment is accompanied with various impacts，including material degradation，effective stress decreasing and buoyancy in rock masses. These phenomena are related with some engineering concerns like landslide，dam stability and reservoir-induced earthquake. However，research on mechanism of impounding effects is still limited. By extending the strength reduction method(SRM) in slope limit analysis，a modified method named stiffness and strength reduction method(SSRM) is proposed and implemented in FEM codes to simulate material degradation. Moreover，the expression of effective stress for fractured rock mass with fluid is incorporated into the Drucker-Prager criterion. Based on monitoring data of left bank slope deformation and valley width reduction of Jinping I arch dam，the above two methods are applied in the analysis of impounding influence of slope and foundation. Results show that the dam has good capability against slope deformation，with displacement and stress fields locally changed.

Key words： slope engineering impoundment high arch dam effective stress strength reduction

引用本文:

杨强，潘元炜，程立，刘耀儒. 蓄水期边坡及地基变形对高拱坝的影响[J]. 岩石力学与工程学报, 2015, 34(S2): 3979-3986.
YANG Qiang，PAN Yuanwei，CHENG Li，LIU Yaoru. IMPOUNDING INFLUENCE OF SLOPE AND FOUNDATION DEFORMATION ON HIGH ARCH DAM. , 2015, 34(S2): 3979-3986.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.0860 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/IS2/3979

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