汶川地震灾区某工程开挖边坡变形三维稳定性分析
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摘要
汶川地震灾区某边坡,因厂房建设需要,对其进行开挖改造。鉴于其稳定性对工厂正常运行有重要影响,本文在岩体质量分级和岩体结构模型概化的基础上,采用快速拉格朗日差分法FLAC3D模拟边坡开挖,分析了边坡在自然条件、暴雨条件以及地震条件下的应力场、位移场、剪应变增量及塑性区的分布和变化特征。研究结果表明:边坡开挖引起坡面局部应力集中,后缘易拉裂破坏;降雨时呈现部分区域安全储备较低;在地震作用下,边坡处于不稳定状态。
As a result of plant-building needs,a slope was dealt with excavating treatment in the region of Wenchuan earthquake.In consideration of its stability having influence on normal operation of the plant and on the basis of rock classification and generalization model of rock mass structure,Fast Lagrangian method FLAC3D simulation of slope excavation was used to analyze the stress field,displacement field,shear strain increment and the plastic zone distribution which could be under the natural conditions,heavy rain conditions,and seismic conditions.The results showed that:excavation caused local stress concentration,posterior border easy to fail in tension;part of the regione was in low security reserve under rain;the slope was unstable due to the earthquake.
As a result of plant-building needs,a slope was dealt with excavating treatment in the region of Wenchuan earthquake.In consideration of its stability having influence on normal operation of the plant and on the basis of rock classification and generalization model of rock mass structure,Fast Lagrangian method FLAC3D simulation of slope excavation was used to analyze the stress field,displacement field,shear strain increment and the plastic zone distribution which could be under the natural conditions,heavy rain conditions,and seismic conditions.The results showed that:excavation caused local stress concentration,posterior border easy to fail in tension;part of the regione was in low security reserve under rain;the slope was unstable due to the earthquake.
引文
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[2]陈龙,吴秋平,马磊,等.边坡岩体力学参数计算值的确定方法[J].边坡工程,2007,11(3):55-57.
[3]李伟胜,李天斌,王兰生.边坡岩体质量分类体系的CSMR法及应用[J].地质灾害与环境保护,2001,12(2):69-72.
[4]赵克烈,张世雄,王官宝,等.FLAC3D在深凹边坡形状优化中的应用[J].露天采矿技术,2006,(1):25-28.
[5]李媛.四川雅安市雨城区降雨诱发滑坡临界值初步研究[J].水文地质工程地质,2005,(1):26-29.
[6]丁秀美,刘光士,黄润秋,等.剪应变增量在堆积体边坡稳定性研究中的应用[J].地球科学进展,2004,19[S]:318-323.
[7]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2008:15-16.
[8]王存玉.地震条件下二滩水库岸坡稳定性研究[A].岩体工程地质力学问题(七)[C].北京:科学出版社,1987.
[9]何蕴龙,陆述远.岩石边坡地震作用近似计算方法[J].岩土工程学报,1998,20(2):66-68.
[10]祁生文,伍法权,严福章,等.岩质边坡动力反应分析[M].北京:科学出版社,2007:30-63.
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