青藏高原山区某公路滑坡滑动机理及其稳定性分析
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摘要
以青海省南部省道红土山段滑坡为例,在分析区域地质概况和滑坡特征的基础上,对滑坡机理及影响滑坡的因素进行分析,确定滑坡滑动模式;选取合理的计算参数进行滑坡稳定性计算,根据计算结果对滑坡稳定性进行分析。得到以下结论:产生滑坡体病害的主要原因是滑坡所处区域冻土深度较大,区域冬夏温差大,地表水下渗后冻胀,次年夏初消融,这使粘性土及泥岩泥化,粘聚力降低,周而复始,滑体不断蠕动下滑。采用传递系数法对滑坡在不同工况下的稳定性进行计算,结果表明,在天然状态下滑坡浅层滑面处于蠕动变形状态,深层滑面基本稳定;在考虑暴雨和地震的条件下,滑坡处于不稳定状态。
This paper takes a landslide in south Qinghai Province as an example,on the basis of the analysis of regional geology and landslide characteristics,analyzed the mechanism of landslide and factors influencing landslide,determined the sliding mode,selected rational parameters for landslide stability calculation,carried out analysis of landslide stability according to the calculation result,summarized the mechanism and reasons of landslide in the area,providing reference experiences for similar geological disaster management.Through the analysis and calculation it concludes: the cause for occurrence of landslide hazards is poor lithology,frozen soil depth in the area where landslide is located is larger,regional temperature difference between summer and winter is large,surface water is frozen in winter and melt in next summer,inducing muddy clay and shale as well as lower cohesion,sliding body creeps continuously and slides down.By using transfer coefficient method,the stability of landslide in different conditions is calculated.The results show that under the natural conditions,shallow sliding surface of landslide is in creep deformation condition,deep sliding surface is basically stable,in consideration of rainstorm and seismic conditions,the landslide is in unstable state.
This paper takes a landslide in south Qinghai Province as an example,on the basis of the analysis of regional geology and landslide characteristics,analyzed the mechanism of landslide and factors influencing landslide,determined the sliding mode,selected rational parameters for landslide stability calculation,carried out analysis of landslide stability according to the calculation result,summarized the mechanism and reasons of landslide in the area,providing reference experiences for similar geological disaster management.Through the analysis and calculation it concludes: the cause for occurrence of landslide hazards is poor lithology,frozen soil depth in the area where landslide is located is larger,regional temperature difference between summer and winter is large,surface water is frozen in winter and melt in next summer,inducing muddy clay and shale as well as lower cohesion,sliding body creeps continuously and slides down.By using transfer coefficient method,the stability of landslide in different conditions is calculated.The results show that under the natural conditions,shallow sliding surface of landslide is in creep deformation condition,deep sliding surface is basically stable,in consideration of rainstorm and seismic conditions,the landslide is in unstable state.
引文
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[2]周维钰.红土山滑坡稳定性分析及治理[J].山西建筑,2007,33(23):102-103.
[3]吴红刚,马惠民,张红利,等.青海高原红层滑坡机理的地质综合分析[J].西北地震学报,2011,33(增刊):414-417.
[4]韩琨,高安民,周维钰.青海红土山滑坡工程的治理方案选择[J].探矿工程(岩土钻掘工程),2007,34(7):40-43.
[5]石豫川,冯文凯,刘汉超,等.特大多期复合型滑坡稳定性评价及因素敏感性分析[J].岩土力学,2004,25(6):975-980.
[6]殷跃平.长江三峡库区移民迁建新址重大地质灾害及防治研究[M].北京:地质出版社,2004.
[7]苏爱军,冯明全.滑坡稳定性传递系数计算法的改进[J].地质灾害与环境保护,2002,13(3):51-55.
[8]刘广润,晏鄂川,练操.论滑坡分类[J].工程地质学报,2002,10(4):1-5.
[9]雍睿,朱志明,邹宗兴,等.万塘滑坡治理效果预测评价[J].煤田地质与勘探,2012,40(1):55-59.
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