摘要
赵家岩崩塌是发生在鄂西山区的一处典型岩质崩塌。野外调查发现,陡峻地形、裂隙发育岩体、平缓软弱夹层是危岩形成的基础,岩溶作用、采煤活动是危岩变形发展的影响因素,强降雨是崩塌发生的直接诱因。为了弄清崩塌的形成机理和失稳模式,文章在对崩塌形成条件和影响因素定性分析的基础上,采用刚体极限平衡方法,分别计算了可能失稳模式下,危岩失稳所需后缘裂缝内的临界水头高度,进而通过对比分析,对危岩的失稳方式进行了讨论。结果显示,崩塌发生是危岩在后缘裂缝静水压力推动下,沿下伏炭质页岩层发生剪切滑动破坏,进而产生了滑移式崩塌。该崩塌形成机理的分析结果,可以为鄂西山区类似的崩塌分析与防治提供参考。
The Zhaojiayan rock fall is a typical rock fall which occurred at the mountainous area in western Hubei.Field investigation shows that steep terrain,fissured rock masses and gentle weak intercalated layer are the basis of dangerous rock masses formation;karstification and coal mining activities are the influence factors which had resulted in deformation development of dangerous rock masses;and heavy rain is the direct incentive of rock fall occurrence.In order to find out the formation mechanism and failure mode,critical water head height in the back tensile crack are calculated with the rigid block limit equilibrium method for potential failure modes on the basis of qualitative analysis of formation conditions and influence factors of the rock fall.The collapse failure mode is discussed by comparison analysis.The results show that the underlying carbonaceous shale has been sheared as the dangerous rock masses are pushed out by the water pressure which is filled in the back tensile crack,and the sliding rock fall happens.The analysis results can be used as a reference for analysis of similar rock falls and prevention occurred in the mountainous areas in western Hubei.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2012年第6期114-118,共5页
Hydrogeology & Engineering Geology
基金
西部复杂山体地质灾害成灾模式研究(121201114029)
关键词
崩塌
形成机理
失稳模式
极限平衡法
赵家岩崩塌
rock fall
formation mechanism
failure mode
limit equilibrium method
Zhaojiayan rock fall
