复杂地质水库边坡滑动带的强度参数反演及其稳定性研究
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摘要
复杂地质水库边坡因其覆盖层厚、地质岩土层多等特点一直成为边坡治理的难点。采用Morgenstern-Price法对长江中下游某水库复杂地质边坡滑动带强度参数进行反演,基于反演参数,分析蓄水深度、抗滑桩加固形式及开挖削坡减载等工况对边坡稳定性影响。研究结果表明:①该复杂地质水库边坡滑动带强度反演参数内摩擦角为10.4°,黏聚力为22 kPa,内摩擦角的敏感度要比黏聚力更高;②边坡稳定安全系数随着水库蓄水深度增加而降低;③设立抗滑桩对该边坡的安全加固作用没有显著效果,而开挖削坡对提高该边坡安全稳定作用效果明显,开挖削坡后的边坡安全系数达到1.262,处于安全稳定状态。研究成果可为复杂地质水库边坡的加固治理研究提供参考。
The complex geological reservoir slope has always been a difficult point for slope treatment due to its thick cover and geological rock layers. The Morgenstern-Price method was used to invert the strength parameters of the complex geological slope sliding layer of a reservoir in the middle and lower reaches of the Yangtze River. Based on the inversion parameters, the influences of water storage depth, anti-slide pile reinforcement form and excavation slope reduction on slope stability were analyzed. The research shows that: ①The inversion parameters of the sliding layer of the complex geological reservoir slope have an friction angle of 10.4° and a cohesive force of 22 kPa. The sensitivity of the friction angle is stronger than that of the cohesive force; ②The stability safety factor decreases with the increase of reservoir water storage depth; ③The establishment of anti-slide pile has no significant effect on the safety reinforcement of the slope, and the excavation and slope cutting has obvious effect on improving the safety and stability of the slope. The safety factor of the slope after cutting the slope reaches 1.262, which is in a safe and stable state. The research results can provide reference for further research on the reinforcement of complex reservoir slopes.
The complex geological reservoir slope has always been a difficult point for slope treatment due to its thick cover and geological rock layers. The Morgenstern-Price method was used to invert the strength parameters of the complex geological slope sliding layer of a reservoir in the middle and lower reaches of the Yangtze River. Based on the inversion parameters, the influences of water storage depth, anti-slide pile reinforcement form and excavation slope reduction on slope stability were analyzed. The research shows that: ①The inversion parameters of the sliding layer of the complex geological reservoir slope have an friction angle of 10.4° and a cohesive force of 22 kPa. The sensitivity of the friction angle is stronger than that of the cohesive force; ②The stability safety factor decreases with the increase of reservoir water storage depth; ③The establishment of anti-slide pile has no significant effect on the safety reinforcement of the slope, and the excavation and slope cutting has obvious effect on improving the safety and stability of the slope. The safety factor of the slope after cutting the slope reaches 1.262, which is in a safe and stable state. The research results can provide reference for further research on the reinforcement of complex reservoir slopes.
引文
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[3] 周时,黄宜胜,胡耀普,等.玛尔挡水电站边坡岩体宏观力学参数优化反演及应用[J].长江科学院院报,2014,31 (7):49-52.
[4] 邓东平,李亮,赵炼恒.极限平衡理论下边坡稳定性抗滑强度参数反演分析[J].长江科学院院报,2017,34(3):67-73.
[5] 石崇,张玉,孙怀昆,等.争岗滑坡堆积体滑面强度参数反演分析[J].岩石力学与工程学报,2010,29(S2):3728-3734.
[6] 杨秀萍.基于参数反演的水布垭面板堆石坝的安全评价[D].大连:大连理工大学,2011.
[7] 李骞,李宁.基于参数敏感性反演分析的岩质高边坡稳定性研究[J].西安理工大学学报,2012,28(2):132-137.
[8] 李志林,王星华,谢李钊,等.基于滑动面深度的地震作用下边坡强度参数反分析[J].公路交通科技,2013,30(5):8-12.
[9] 刘超.黄土高边坡抗剪强度参数反演研究[D].西安:长安大学,2014.
[10] YAMAGAMI T,UETA Y.Search for noncircular slip surfaces by the Morgenstern-Price method[C]//Proc.int.conf.numer.meth- ods in Geomech,1988:1219-1223.
[11] 中华人民共和国国家发展和改革委员会.DLT 5337—2006:水电水利工程边坡工程地质勘察技术规程[S].北京:中国电力出版社,2006.