四川省青川县银溪窝滑坡复活机制研究及稳定性评价
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摘要
银溪窝滑坡位于四川省青川县白家乡佛山村一社,属于滑移-弯曲溃决型变形破坏形成的老滑坡体。近期,滑坡堆积体表现出一定的蠕滑变形迹象,表层局部滑塌现象较发育。"5·12"汶川地震,造成滑坡体的变形进一步加剧,中后部形成多条具一定规模的继承性圈弧状裂缝(带),坡体稳定性进一步降低,对坡体上居民的生命财产安全构成严重威胁。根据滑坡结构及变形破裂特征,结合其所处的地质环境条件,对滑坡的复活机制进行了研究,判定滑坡体在不利工况下处于欠稳定状态,提出了"后缘截水+裂缝填封+前缘抗滑桩"的综合治理方案对其进行治理。
Silver Creek nest landslide is located in the first community of Foshan village,Qingchuan County in Sichuan Province.Qingchuan is characterized as the old landslide of slip-bending failure formation.Recently,the landslide shows some signs of deformation.The sign is surface slumping.Because of 5·12 Wenchuan earthquake,the landslide showed the further intense deformation,forming a certain scale of inheritance circle arc-shaped crack in the middle of the landslide,which caused the landslide stability became worse,posing a serious threat to the life and property of the residents on the slope.According to the structure and deformation fracture characteristics of landslide,combined with geological environment,the resurrection mechanism of landslide was studied.The results show that landslide is less stable in adverse working conditions.Based on the above results,it is suggested to use the landslide treatment measures of 'ntercepting water on the trailing edge+filling cracks+anti-slide pile in the front' to control landslide.
Silver Creek nest landslide is located in the first community of Foshan village,Qingchuan County in Sichuan Province.Qingchuan is characterized as the old landslide of slip-bending failure formation.Recently,the landslide shows some signs of deformation.The sign is surface slumping.Because of 5·12 Wenchuan earthquake,the landslide showed the further intense deformation,forming a certain scale of inheritance circle arc-shaped crack in the middle of the landslide,which caused the landslide stability became worse,posing a serious threat to the life and property of the residents on the slope.According to the structure and deformation fracture characteristics of landslide,combined with geological environment,the resurrection mechanism of landslide was studied.The results show that landslide is less stable in adverse working conditions.Based on the above results,it is suggested to use the landslide treatment measures of 'ntercepting water on the trailing edge+filling cracks+anti-slide pile in the front' to control landslide.
引文
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[2]四川省地质局第二区域地质测量队二分队.广元幅1∶20万区域地质图[Z].1963-1966.
[3]李明辉,郑万模,石胜伟,等.丹巴县甲居滑坡复活机制及其稳定性分析[J].山地学报,2008,26(5):577-582.
[4]黄达,裴向军,张志刚,等.某公路滑坡成因机制及稳定性[J].山地学报,2008,26(6):721-726.
[5]黄润秋.20世纪以来中国的大型滑坡及其发生机制[J].岩石力学与工程学报,2007,26(3):434-454.
[6]殷跃平.长江三峡库岸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.
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