水电站高边坡变形及强度稳定性的系统分析研究
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摘要
如何准确地研究水电站高边坡的稳定性问题一直是水电工程地质学者专家的研究热点。在此提出工程地质原型分析、离散元二维数值模拟和极限平衡法相结合的变形稳定性和强度稳定性的系统工程分析方法。以吉林台水电站坝址区高边坡BT20的稳定性问题为例,首先详细分析了该高边坡的工程地质特性,并利用工程地质定性分析法预测了该高边坡的最危险滑动面,然后利用离散元软件UDEC对高边坡的变形特征进行数值模拟分析,数值模拟结果与工程地质分析得到的结论十分吻合。确定了高边坡的危险滑动面就为后面的强度稳定性分析奠定了基础,采用Modified Sarma法计算了边坡在不同工况下的安全系数,敏感性分析结果表明地震作用和地下水位上升对边坡稳定性的威胁最大。
How to solve the stability problem of a hydroelectric project has always attracted much attention of engineering geologists. In this paper,a systematic analytical method for the stability evaluation of a high slope is put forward,including engineering geology model establishment,2-D numerical modeling with distinct element method and limit equilibrium method. This paper has the high slope of BT20 at the dam location area of Jinlingtai hydroelectric plant as the research case. At first,the engineering geological characteristics of the high slope is analyzed in detail,and one engineering geological model is established;secondly,the software UDEC is used to analyze the deformation characteristics of the high slope to determine the critical sliding surface,and the results accord with those conclusions based on the engineering geological analysis;finally the Modified Sarma method is adopted to calculate the safety factors of the slope under different engineering conditions. The sensitivity analysis shows that seismic actions and rise of underground water level have most dangers to the stability of the slope.
How to solve the stability problem of a hydroelectric project has always attracted much attention of engineering geologists. In this paper,a systematic analytical method for the stability evaluation of a high slope is put forward,including engineering geology model establishment,2-D numerical modeling with distinct element method and limit equilibrium method. This paper has the high slope of BT20 at the dam location area of Jinlingtai hydroelectric plant as the research case. At first,the engineering geological characteristics of the high slope is analyzed in detail,and one engineering geological model is established;secondly,the software UDEC is used to analyze the deformation characteristics of the high slope to determine the critical sliding surface,and the results accord with those conclusions based on the engineering geological analysis;finally the Modified Sarma method is adopted to calculate the safety factors of the slope under different engineering conditions. The sensitivity analysis shows that seismic actions and rise of underground water level have most dangers to the stability of the slope.
引文
[1]刑建民.浅谈高边坡稳定性研究的发展[J].长沙大学学报,2000,14(2):65―67.
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[4]黄润秋,林峰,陈德基,等.岩质高边坡卸荷带形成及其工程性状研究[J].工程地质学报,2001,9(3):227―232.
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[9]马照亭,梁海华.Sarma法在四川云阳鸡扒子滑坡稳定性评价中的应用[J].地震地质,2002.9,24(3):461―468.
[2]王仲锦.岩石高边坡稳定性分析的系统研究[J].中国地质灾害与防治学报,1998.3,9(1):15―19.
[3]李天斌.岩质工程高边坡稳定性及其控制的系统研究[J].岩石力学与工程学报,2003.2,22(2):341―341.
[4]黄润秋,林峰,陈德基,等.岩质高边坡卸荷带形成及其工程性状研究[J].工程地质学报,2001,9(3):227―232.
[5]杨健,耿克勤.吉林台水电站厂房高边坡稳定性及加固措施研究[J].水文地质工程地质,2004,(2):41―44.
[6]侯克鹏,阮永芬.离散元法模拟边坡稳定性若干问题探讨[J].昆明理工大学学报,2000.2,25(1):92―94.
[7]陈祖煜.岩质高边坡稳定分析方法与软件系统[J].水力发电,1998,(3):48―51.
[8]姚爱军,何满潮.MSARMA法在边坡稳态概率分析中的应用[J].岩石力学与工程学报,2002.21(12):1839―1842.
[9]马照亭,梁海华.Sarma法在四川云阳鸡扒子滑坡稳定性评价中的应用[J].地震地质,2002.9,24(3):461―468.
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