巴东滑坡稳定性及影响因素敏感性分析
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摘要
巴东滑坡是长江三峡水利枢纽库区近坝库段内的大型滑坡之一,其稳定性危及到沿岸居民及三峡水库安全。文中对滑坡的地质概况及滑坡稳态发展趋势进行了分析,采用不平衡推力法对滑坡的稳定性进行了计算,并对影响滑坡的因素进行了敏感性分析。结果表明,三峡水库蓄水后,滑坡将处于不稳定状态;滑坡底滑面φ值、水平地震系数Kc、以及单位加固力F值以及加固角ω值等因素为主要因素。水库蓄水后,须采取加固措施进行防治,加固滑坡时最佳加固角为-30°～-10°。
Badong landslide is one of the large landslides in the near dam region of Three Gorges Reservoir,and it endangers the stability of the residents along the landslide and Three Gorges Reservoir.In this paper,its geologic situations and steady trends are discussed,the unbalanced thrust method is adopted to calculate the stability of the landslide,and on this basis,the sensitivity of factors affecting the landslide is analyzed.The results show that after Three Gorges Reservoir is filled,the landslide will be in an unstable state.The main influencing factors are φ values of the slip surface,the horizontal seismic coefficient Kc,F value of the unit reinforcement force,and ω value of the reinforcing angle,and the optimum reinforcement angle is-30°～-10°.
Badong landslide is one of the large landslides in the near dam region of Three Gorges Reservoir,and it endangers the stability of the residents along the landslide and Three Gorges Reservoir.In this paper,its geologic situations and steady trends are discussed,the unbalanced thrust method is adopted to calculate the stability of the landslide,and on this basis,the sensitivity of factors affecting the landslide is analyzed.The results show that after Three Gorges Reservoir is filled,the landslide will be in an unstable state.The main influencing factors are φ values of the slip surface,the horizontal seismic coefficient Kc,F value of the unit reinforcement force,and ω value of the reinforcing angle,and the optimum reinforcement angle is-30°～-10°.
引文
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[2]姚爱军,薛廷河.复杂边坡稳定性评价方法与工程实践[M].北京:科学出版社,2008.
[3]武雄,姚爱军,衡朝阳,等.边坡稳定性评价MSARMA法及最佳加固力研究[J].中国地质灾害与防治学报,2004,15(2):104-107.
[4]姚爱军,易武,王尚庆.杨家岭1#滑坡稳定性影响因素及敏感性分析[J].工程地质学报,2004,12(4):390-395.
[5]张少宏.黄土边坡稳定计算中参数的敏感性分析[J].水利与建筑工程学报,2003,1(3):40-42.
[6]曹军义,展辰辉,王改山.土质高边坡稳定因素的敏感性分析[J].岩石力学与工程学报,2005,24(2):5350-5354.
[7]胡高社,任红珠,丁岩.基于因素敏感性分析的人工排土场高边坡稳定性研究[J].工程地质学报,2007,15(4):555-558.
[8]杨继红,刘汉东,秦四清,等.黄河堤防边坡稳定性多因素敏感性分析[J].人民黄河,2008,30(1):15-17.
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