建筑物载荷作用下采动残余空隙区变形机理与探测分析(点击标题下载全文) 已下载

作者:徐平;茅献彪张敏霞周跃进李佳伟

作者单位:中国矿业大学深部岩土与地下工程国家重点实验室河南理工大学土木工程学院

摘要:为了分析建筑物载荷作用下采动残余空隙区失稳机理,建立了采动残余空隙区覆岩结构稳定条件。分析结果表明:建筑物附加应力作用下采动残余空隙区岩块的下滑力增大,而抗滑力基本不变,岩块容易表现出滑落压密下沉。结合义马某矿采动塌陷区地表建筑损坏情况,采用高密度电阻率层析成像技术,确定了采动残余空隙区的分布范围,通过计算残余空隙区附加应力值,分析了造成建筑物不同损害程度的原因。采动残余空隙区失稳机理及探测数据表明:采动残余变形与所受附加应力的大小相关,附加应力随埋深增加而递减,采动残余空隙的分布深度及承受的建筑物附加应力值是判断其是否再次失稳的依据。

基金:国家重点基础研究发展计划(973计划)(2013CB227900,2010CB226800);国家自然科学基金资助项目(51374201);河南省教育厅科学技术研究重点项目(14A560002,14B560021);

关键词:建筑附加应力;采动残余变形;覆岩;探测;

DOI:10.16186/j.cnki.1673-9787.2015.01.006

分类号:TD823.8

Abstract:In order to analyse the deformation mechanism for the mining residual cavities affected by buildings additional stress,the stability conditions of the rocks in mining residual cavities had been established.The analysis results show that the sliding force of overhanging rocks increased under the buildings additional stress in mining residual cavities,and the anti-sliding force is basically unchanged and rock is easy to show slide compaction subsiding.According to the damages of the buildings in mining-induced subsidence areas of Yima mine,the influence scope of the mining residual cavities areas have been defined by a high density resistivity method.In addition,the reasons leading to the different damage degree for the buildings were analyzed according to the additional stress distribution.The deformation mechanism and detection analysis for the mining residual cavities indicate that the residual deformation is much affected by additional stress.However,additional stress of the strata decreases along with increasing burial depth.Thusly the burial depth of the mining residual cavities and the additional stress applied are the main factors to decide whether the mining residual cavities are unstable again.

 
 
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