四川茂县维城乡后山古滑坡形成机制及稳定性评价
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摘要
结合灾后应急勘察,通过大比例尺工程地质测绘及钻探等手段对维城乡后山堆积体结构进行了系统调查,认为后山堆积体为一古滑坡。滑坡形成前为一变质砂岩和千枚岩构成的顺向坡且顺坡面走向陡倾长大结构面发育,峡谷期河流的快速下蚀作用使斜坡前缘形成陡立临空面,重力作用下,坡体后缘顺层滑移拉裂并最终整体滑动形成古滑坡,运用理正软件搜索古滑坡潜在不稳定滑面,并对其稳定性进行计算和评价,认为其局部复活但整体处于稳定状态。
Based on emergency exploration after Wenchuan earthquake,by large-scale engineering geological mapping and drilling, the authors systematically investigated the accumulation body of Houshan in Weicheng township, held that the accumulation body was an ancient landslide.The convex left bank in Weicheng used to be a consequent slope composed of metasandstone and phyllite before ancient landslide forming,under the role of the rapid river erosion in deep valley stage,the front part of the slope was cut into a steeply free face,under the slope gravity,posterior edge of slope rupture and bedding slip,finally an ancient landslide happened.In this paper, Lizheng software was used to search for potential instability slip surface in the ancient landslide,calculation and evaluation on its stability show that the ancient landslide is active partly, but whole slope is stable.
Based on emergency exploration after Wenchuan earthquake,by large-scale engineering geological mapping and drilling, the authors systematically investigated the accumulation body of Houshan in Weicheng township, held that the accumulation body was an ancient landslide.The convex left bank in Weicheng used to be a consequent slope composed of metasandstone and phyllite before ancient landslide forming,under the role of the rapid river erosion in deep valley stage,the front part of the slope was cut into a steeply free face,under the slope gravity,posterior edge of slope rupture and bedding slip,finally an ancient landslide happened.In this paper, Lizheng software was used to search for potential instability slip surface in the ancient landslide,calculation and evaluation on its stability show that the ancient landslide is active partly, but whole slope is stable.
引文
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[11]GB50330-2002,建筑边坡工程技术规范[S].(GB-50330-2002)Technical code for building slope engineering[S].
[2]王运生,罗永红,吉峰,等.汶川大地震山地灾害发育的控制因素分析[J].工程地质学报,2008,16(6):759-763.Wang Yunsheng,Luo Yonghong etc.Analysis of the controlling factors on geo-hazards in mountainous epicenter zones of the WenChuan earthquake[J].Journal of Engineering Geology,2008,16(6).
[3]黄润秋,许强.中国典型灾难性滑坡[M].北京:科学出版社,2008.R.Q.Huang,Q.xu etc.Catastrophic landslides in china[M].Beijing Science Press.2008.
[4]肖进,许强,曾裕平.文家梁古滑坡形成机制及稳定性分析[J].路基工程,2007,(4).Xiao Jin,XuQiang,Zeng Suping.Genetic mechanismand stabil-ity analysis of the ancient landslide of Wenjialiang[J].Subgrade Engineering,2007,(4).
[5]罗超俊.公路边坡滑坡稳定性分析[J].中国科技信息,2005,(18).Luo Chaojun.Landslide stability analysis of highway slope.Chi-na Science and Technology Information.2005/18.
[6]梁利喜,许强,刘天翔,等.四川某滑坡成因机制分析及稳定性评价研究[J].水土保持研究,2007,(02).Liang Li-xi;XuQiang;Liu Tianxiang;Tang Minggao;Fan Xu-anmei.Study on the formation mechanism and stability of a landslide in Sichuan.Research of Soil and Water Conservation.2007/02.
[7]赵纪生,魏景芝.汶川8.0级地震滑坡、崩塌机制[J].震灾防御技术,2008,(4):379-383.Zhao Jisheng,WeiJingzhi.Landslide and collapse mechanism of Wenchuan8.0earthquake.Earthquake Prevention Technology.2008(4).
[8]《工程地质手册》编委会.工程地质手册(第4版)[K].北京:中国建筑工业出版社,2007.Engineering Geology Handbook(4th edition)-2007.
[9]DZ/T0218-2006,滑坡防治工程勘查规范[S].《Specification of Geological Investigationfor Llandside Stabiliza-tion》(DZ/T0218-2006)Page20.
[10]高雄鹰.浅析滑坡生成的地质条件[J].四川建筑,2004,(03).Gao Xiongying.Analysis the geologe conditionfor landslide.Si-chuan Architectural.2004,(03).
[11]GB50330-2002,建筑边坡工程技术规范[S].(GB-50330-2002)Technical code for building slope engineering[S].
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