四川某水库右坝肩滑坡成因机制及稳定性分析
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摘要
拟建水库右坝肩处于由砖红色砂岩夹薄层或透镜状泥岩、粉砂质泥岩构成的斜向V形河谷中,无明显断层构造,雨水充沛且存在一古滑坡,经过调查,滑坡主要由滑坡堆积体和滑动面以及其下方的扰动带组成,滑坡区发育的纵向和横向结构面以及岩层面构成一楔形槽。认为滑坡的成因是暴雨下楔形槽内控制的滑移-拉裂破坏。经过定性分析,古滑坡天然状态是稳定的。采用极限平衡法计算古滑坡在天然状态、地震作用以及暴雨等工况下的稳定系数分别为1.45、1.39及1.27,由此可知滑坡在天然状态下是稳定的,地震作用对其稳定性影响不大,但暴雨作用下滑坡的稳定性有所降低。最后通过数值模拟再现了现阶段古滑坡的应力应变场和变形破坏特征。
A proposed reservoir dam stands in a V-shaped valley.The ground is composed with the semi-longitudinal brick red sandstone and foliated or lenticular mudstone,silty sand mudstone intermediate layer.It has no evident fault structure.It has an old landslide.The rain is plenty.Based on investigation,the old landside has landslide debris accumulation,slipped surface and the bottom disturbed zone.The development of vertical and horizontal structure planes of the landslide area and bedding plane constitute a wedge-shaped slot.The cause of the landslide formation can be due to the fact that the slippage-tension failure took place at the wedge-shaped slot under heavy rain.The limit equilibrium method is used to calculate the stability factors.The stability factors are 1.45 in the natural state,1.39 in the seismic state and 1.27 in the heavy rain state,respectively.Therefore,the landslide is stable in the natural state.The role of earthquake impact in the stability is not significant.But the stability of the landslide will be lower under the heavy rain.Finally,the stress-strain field and deformation failure features of the ancient landslide at this stage are reproduced through finite element simulation.
A proposed reservoir dam stands in a V-shaped valley.The ground is composed with the semi-longitudinal brick red sandstone and foliated or lenticular mudstone,silty sand mudstone intermediate layer.It has no evident fault structure.It has an old landslide.The rain is plenty.Based on investigation,the old landside has landslide debris accumulation,slipped surface and the bottom disturbed zone.The development of vertical and horizontal structure planes of the landslide area and bedding plane constitute a wedge-shaped slot.The cause of the landslide formation can be due to the fact that the slippage-tension failure took place at the wedge-shaped slot under heavy rain.The limit equilibrium method is used to calculate the stability factors.The stability factors are 1.45 in the natural state,1.39 in the seismic state and 1.27 in the heavy rain state,respectively.Therefore,the landslide is stable in the natural state.The role of earthquake impact in the stability is not significant.But the stability of the landslide will be lower under the heavy rain.Finally,the stress-strain field and deformation failure features of the ancient landslide at this stage are reproduced through finite element simulation.
引文
[1]成都理工大学.西南某水库右坝肩滑坡和下游堆积体稳定性评价及对策[R].成都理工大学档馆,2001.Chengdu University of Technology.The countermeasures and eval-uation of the stability to the reservoir right dam landslide anddownstream accumulation in the southwest.Chengdu University ofTechnology Archives,2001.
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[2]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1994.Zhang Zhuoyuan,Wang Shitian,Wan Lansheng.Analysis of theprinciples of engineering geology.Beijing:Geology Press,1994.
[3]方玉树.滑坡稳定分析传递系数法若干问题、讨论[J].工程地质学报,2007,15(5):607~611.Fang Yushu.The issues of landslide stability analysis of the trans-fer coefficient.Journal of Engineering Geology,2007,15(5):611~607.
[4]陶志平,周德培,岳志勤.滑坡推力计算中传递系数法的改进研究[J].路基工程,2006,(5):80~81.Tao Zhiping,Zhou Depei,Yue Zhiqin.The study of improve themethod of transfer coefficient in the landslide’s thrust calculation.Roadbed,2006,(5):80~81.
[5]何满朝主编.工程地质数值法[M].北京:科学出版社,2006.He Manchao.Engineering geology numerical methods.Beijing:Science Press,2006.
[6]水利水电科学研究院等单位.岩石力学参数手册[S].北京,水利电力出版社,1991.Water Resources and Hydropower Research Institute and other u-nits.Handbook of rock mechanics parameters.Beijing:WaterConservancy and Electric Power Press,1991.
[7]张传庆,周辉,冯夏庭.基于破坏接近度的岩土工程稳定性评价[J].岩土力学,2007,28(5):888~894.Zhang Chuanqing,Zhou Hui,Feng Xiating.The stability ofgeotechnical engineering evaluation based on the close to degree ofdamage.Geomechanics,2007,28(5):888~894.
[8]金丰年,浦奎英.破坏度的定义及应用[J].工程力学,1996,(增刊):626~630.Jin Fengnian,Pu Kuiying.The definition and application of thedegree of damage.Engineering Mechanics,1996,(Suppl.):626~630.
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