万州孙家荆竹屋基滑坡滑动模型研究  

Sliding Model of Jingzhuwuji Landslide in Sunjia Town,Wanzhou District

作　　者：姜波[1] 柴波[1] 方恒[1] 王佳佳[2] 黄发明[3] 

机构地区：[1]中国地质大学(武汉)环境学院,武汉430074 [2]中国地质大学(武汉)工程学院,武汉430074 [3]中国地质大学(武汉)地质调查研究院,武汉430074

出　　处：《长江科学院院报》2015年第8期103-109,共7页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(41202247);中国地质调查局项目(121201122017);中央高校优秀青年教师基金项目(2012049018)

摘　　要：荆竹屋基滑坡的滑动过程存在多种解体模式,为了研究该类顺层岩质滑坡的滑动模型,在对滑坡后滑体结构和地面破裂现象系统调查的基础上,根据解体特征对滑坡进行了分区,并通过建立的滑坡作用强度评价模型,探讨了滑坡滑距、运动解体模式和建筑物易损性等问题。研究结果表明:1前缘采石场的切坡使潜在不稳定的斜坡临空,抗滑力降低,诱发了中部浅层顺层软弱页岩层及后部风化接触带的整体滑动;2主滑体滑移距离约29.5 m,主滑方向为5°,滑体厚度约15 m;3受滑体风化层厚度变化和前地形条件限制,在整体滑动后分区解体现象明显。滑体上各区对建筑物易损性的作用强度从大到小依次为:前缘堆积区(Ⅵ)>后缘拉槽破坏区(Ⅱ)>中部推覆区(Ⅳ)和破碎区(Ⅶ)>局部分块滑移区(Ⅴ)>中部逆冲区(Ⅳ)>顺层整体滑移区(Ⅲ1、Ⅲ2)>后缘拉裂影响区(Ⅰ)。研究绘制出的滑坡解体破碎分区图,对分析滑坡风险分布规律具有参考价值。A large bedded landslide occurred in Sunjia Town,Wanzhou District of Chongqing. There were multiple disintegration modes in the sliding process. In order to study the slip model of such bedded rock landslide,the slip structure and ground rupture were investigated. Furthermore on this basis,the landslide was partitioned and the sliding distance,movement patterns and building＇s vulnerability were analysed. Results reveal that 1） potentially unstable slopes were made free by slope cutting of the leading edge of the quarry,and the anti-sliding force decreased,which triggered the sliding of shallow bedded weak shale in the middle and weathered contact zone in the back; 2） the primary slip body slid about 29. 5m,the main slide direction was 5° and the thickness of slip body was about 15m; 3） affected by the change of weathered layer thickness and the previous topographical conditions,the partitioned disintegration was obvious after the sliding. The intensity of each partition＇s effect on building＇s vulnerability can be ranged as： front accumulation zone（ Ⅵ） 〉groove damaging zone in the back edge（ Ⅱ）〉 central nappe zone（ Ⅳ）,crushing zone（ Ⅶ）〉 local block sliding zone（ Ⅴ）〉 central thrust zone（ Ⅳ）〉 integral sliding zone（ Ⅲ1,Ⅲ2）〉 affected zone in the back edge（ Ⅰ）. Moreover,the zoning map of landslide＇s crushing and disintegration is given,and it has reference value for analyzing landslide risk distribution.

关 键 词：顺层岩质滑坡 滑距 运动模式 解体 作用强度 

分 类 号：P642.22[天文地球—工程地质学]