陇东地区黄土滑坡稳定性分析
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摘要
在分析陇东地区地质环境背景的基础上,选择在坡度、坡高、滑坡体厚度等方面具有代表性的直线型、凸型、凹型和阶梯型黄土滑坡为计算模型,设定天然、饱水、地震和饱水+地震等4种工况,对不同类型、不同坡度、不同坡高、不同滑坡体厚度的黄土滑坡在各工况条件下的稳定性进行了分析。结果表明:从影响因素看,对滑坡稳定性影响最大的因素是坡度,其次是坡高;从工况条件看,诱发滑坡的主要因素是降雨入渗,其次是地震;从滑坡类型看,直线型滑坡稳定性相对较好,阶梯型滑坡和凸型滑坡次之,凹型滑坡稳定性最差。
The paper selected typical loess landslides of linear-type,convex-type,concave-type and stepped-type on the aspects of slope,height of slope and thickness of landslide based on the analysis of the background of geological environment of eastern Gansu area as a calculating model,and analyzed the stability of landslides under four working conditions of natural,saturation,earthquake and saturation earthquake with different types,different slopes,different heights of slope and different thicknesses of landslide of loess landslides.The outcomes show that: viewing from affecting factors,the maximum affecting factor to the stability of landslide is slope,the next is the height of slope;viewing from working conditions,the main influence factor of landslides is rainfall penetration,the following is earthquake;viewing from the types of landslide,the stability of linear-type is relatively better,then is stepped-type and convex-type,and the concave-type is the worst.
The paper selected typical loess landslides of linear-type,convex-type,concave-type and stepped-type on the aspects of slope,height of slope and thickness of landslide based on the analysis of the background of geological environment of eastern Gansu area as a calculating model,and analyzed the stability of landslides under four working conditions of natural,saturation,earthquake and saturation earthquake with different types,different slopes,different heights of slope and different thicknesses of landslide of loess landslides.The outcomes show that: viewing from affecting factors,the maximum affecting factor to the stability of landslide is slope,the next is the height of slope;viewing from working conditions,the main influence factor of landslides is rainfall penetration,the following is earthquake;viewing from the types of landslide,the stability of linear-type is relatively better,then is stepped-type and convex-type,and the concave-type is the worst.
引文
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[2]张龙,白福.甘肃省滑坡地质灾害特征和危害研究[J].西部探矿工程,2009,21(10):150-152.
[3]杨强,孙秀娟,王爱军,等.甘肃省灵台县地质灾害特征分析[J].中国地质灾害与防治学报,2009,20(4):45-49.
[4]洪嘉祥.甘肃东部滑坡遥感调查分析评价[J].中国水土保持,2005(9):8-10.
[5]朱向锋,黄春长,查小春,等.泾河流域现代洪水泥痕沉积学特征研究[J].干旱区资源与环境,2009,23(8):86-90.
[6]王建杰,田进,杨西林,等.泾渭河冲淤规律分析及渭河下游治理对策研究[J].西北农林科技大学学报:自然科学版,2006,34(8):149-154.
[7]张立荣.甘肃陇东黄土高原黄土潜水水文地质特征浅析[J].西部探矿工程,2009,21(7):158-162.
[8]王洪德,王爱军.甘肃省平凉市灵台县、泾川县、崇信县和崆峒区地质灾害详细调查报告[R].保定:中国地质调查局水文地质环境地质调查中心,2010:25-56.
[9]王维升,万鑫.浅议黄土滑坡的分布规律及形成条件[J].灾害学,2001,16(2):82-86.
[10]姚清林.中国西北黄土地区地震崩滑的分布与宏观影响因素[J].气象与减灾研究,2007,30(1):41-47.
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