巫山县望霞危岩体变形监测及破坏机制分析

乐琪浪; 王洪德; 薛星桥; 高幼龙; 金枭豪; 张俊义; 潘尚涛

巫山县望霞危岩体变形监测及破坏机制分析

中国地质调查局水文地质环境地质调查中心保定 071051

基金项目:

国家重大工程地质灾害预警专项-三峡库区地质灾害专业监测

详细信息

作者简介:
乐琪浪,主要从事工程地质,岩土工程及滑坡监测预警方面的研究工作.Email: leqilang@sina.com

中图分类号: P642.22
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出版历程
- 收稿日期: 2011-05-20
- 修回日期: 2011-08-11
- 刊出日期: 2011-12-25

DEFORMATION MONITORING AND FAILURE MECHANISM OF WANGXIA DANGEROUS ROCK MASS IN WUSHAN COUNTY

Center For Hydrogeology and Environmental Geology,China Geological Survey,Baoding 071051

摘要

摘要: 2010年8月三峡库区望霞危岩变形加剧,对航道安全及坡体上居民的生产生活造成了较大影响。在对新生裂缝详细调查和对变形历史、地表位移、全站仪监测及裂缝位移监测数据分析的基础上,对望霞危岩变形特征及其成因进行了综合分析。研究结果表明:危岩体变形区总体向SW方向位移,并具有明显的沉陷变形特征。T10缝为控制性裂缝,是整个变形区的后边界,主要表现为裂缝张开和沉降变形。T11和T12缝间的块体整体向SW方向位移,并伴随下沉,其下沉量大于水平位移量。由于T11和T12缝间的块体挤压作用,造成T13缝一带岩体的变形明显加剧。危岩体各岩层中节理面相互贯通,形成1组延伸较远,平直,贯通性较好的结构面,与危岩破坏面相互平行,其对危岩的破坏起着控制性作用。危岩体与基座构成了典型的硬-软-硬岩性组合形式,为危岩的层间滑动作用提供了地质结构组合条件。此次裂缝的扩张及塌陷坑的形成是在前一次变形的基础上发展的,其与底部采矿活动关系极为密切。持续降雨后危岩发生向临空面旋转滑移,并形成坐落挤出式崩塌。
- 望霞危岩 /
- 变形监测 /
- 关键裂缝 /
- 软岩基座 /
- 综合分析 /
- 坐落挤出式崩塌
Abstract: In August 2010,serious deformation occurred in the Wangxia dangerous rock mass.The local residents and river channel safety are in high risk.This paper is based on detailed investigation of the new cracks,deformation history,GPS observations,total station monitoring and crack displacement monitoring data analysis.It analyses comprehensively the deformation and reasons of the unstable rock mass.The results show that the overall displacement direction of the rock mass was towards to SW with obvious subsidence deformation.The T10 crack controlled cracking and the back edge of the deformation zone that mainly manifested as crack opening and settlement deformation.The overall displacement direction of the block between the T11and T12 cracks was towards to SW and accompanied with settlement deformation more than horizontal displacement.Serious deformation occurred in the block near the T13 crack,caused by the block squeezing action between the T11and T12 cracks.A group of structural planes with large and straight persistence and good apertures were developed due to connected joint surfaces in the formations of the dangerous rock mass.The planes controlled the destruction of the rock that were parallel to the failure surface.The dangerous rock mass and its weak base rock formed a typical hard to soft to hard lithologic layers,which provided a combined condition of the geological structure for the interlayer-gliding of the rock mass.The expansion of the cracks and collapse pits were formed on the basis of previous deformation.They had very close relationship with the mining activities at the bottom of the rock mass.Subsided extrusion type collapse had formed so that the dangerous rock mass undertook rotational sliding to the free face after rainfall.
- Wangxia /
- Rock mass failure /
- Deformation monitoring /
- Rock cracks /
- Weak base /
- River

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参考文献(1)

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