反倾巨厚层状岩体地震滑坡特征分析
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摘要
针对汶川大地震中产生的在反倾巨厚层状岩体中滑坡的特征,以甘肃武都寨子崖滑坡为实例,通过详细的野外地质调查,结合滑坡区的工程地质环境和面波测试成果,综合分析反倾巨厚层状岩质边坡中形成滑坡的条件,研究其特征和演化机制。不发育结构面、尤其不发育缓倾坡外结构面时此类边坡不具备产生重力滑坡的条件;此类斜坡在仅有水平地震力时同样不易形成滑坡,双向地震力共同作用时易产生地震滑坡。
To aim at the characteristics of earthquake-induced landslide in heavy layer and antidip stratified rock slope which occurred in the Wenchuan great earthquake,with the Zhaiziya landslide located in Wudu of Guansu province,as the example, the forming conditions of the landslide in antidip stratified rock slope are analyzed through detailed field geological survey data.The characteristics and mechanism of the landslide are discussed combining the engineering geological environment and result of surface wave test.The result shows that there is no condition for developing a gravity landslide in this kind of slope with less structure planes,especially less low angle structure planes that inclined to outside of slope.It's difficult to develop a landslide in the slope just by horizontal seismic force also.The earthquake-induced landslide in this kind of slope only occurs when both the horizontal and vertical seismic force act together working.
To aim at the characteristics of earthquake-induced landslide in heavy layer and antidip stratified rock slope which occurred in the Wenchuan great earthquake,with the Zhaiziya landslide located in Wudu of Guansu province,as the example, the forming conditions of the landslide in antidip stratified rock slope are analyzed through detailed field geological survey data.The characteristics and mechanism of the landslide are discussed combining the engineering geological environment and result of surface wave test.The result shows that there is no condition for developing a gravity landslide in this kind of slope with less structure planes,especially less low angle structure planes that inclined to outside of slope.It's difficult to develop a landslide in the slope just by horizontal seismic force also.The earthquake-induced landslide in this kind of slope only occurs when both the horizontal and vertical seismic force act together working.
引文
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[2]康来迅,邹谨敞,蒋荣发,等.昌马断裂带地震滑坡的基本特征[J].华南地震,1995,15(1):49-54.
[3]李秀珍,孔纪名,邓红艳,等.“5.12”汶川地震滑坡特征及失稳破坏模式分析[J].四川大学学报,2009,41(3):72-77.
[4]赵纪生,魏景芝,吴景发,等.汶川8.0级地震滑坡、崩塌机制[J].震灾防御技术,2008,3(4):379-383.
[5]胡斜闻,罗刚,黄润秋,等.唐家山滑坡后壁残留山体震后稳定性研究[J].岩石力学与工程学报,2009,28(11):2349-2359.
[6]殷跃平.汶川八级地震滑坡特征分析[J].工程地质学报,2009,17(1):29-38.
[7]刘应龙,任光明,陈强,等.反倾层状岩体倾倒变形强烈程度研究[J].中国水运,2008,8(12):185-186.
[8]蔡跃,三谷泰浩,江琦哲郎.反倾层状岩体边坡稳定性的数值分析[J].岩石力学与工程学报,2008,27(12):2517-2522.
[9]蒋良潍,黄润秋.反倾层状岩体斜坡弯曲—拉裂两种失稳破坏之判据探讨[J].工程地质学报,2006,14(3):289-294.
[10]谌文武,赵志福,刘高,等.兰州—海口高速公路甘肃段工程地质问题研究[M].兰州:兰州大学出版社,2006.
[11]张国伟,张本仁,袁学诚,等.秦岭造山带与大陆动力学[M].北京:科学出版社,2001.
[12]周民都,吕太乙,张元生,等.青藏高原东北缘地质构造背景及地壳结构研究[J].地震学报,2000,22(6):645-653.
[13]毛彦龙,胡广韬,赵法锁,等.地震动触发滑坡体滑动的机理[J].西安工程学院学报,1998,20(4):45-52.
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