新安矿深部软岩巷道大变形特征及原因  

Research on features and causes of large deformation of deep soft rock roadway in Xin'an coal mine

作　　者：孙晓明[1,2] 王冬[1,2] 王聪[1,2] 

机构地区：[1]深部岩土力学与地下工程国家重点实验室,北京100083 [2]中国矿业大学力学与建筑工程学院,北京100083

出　　处：《黑龙江科技学院学报》2014年第1期1-5,共5页Journal of Heilongjiang Institute of Science and Technology

基　　金：国家自然科学基金重点项目(51134005);国家自然科学基金面上项目(51374214);教育部新世纪优秀人才支持计划项目(NCET-07-0800);中央高校基本科研业务费专项资金项目(2009QL03)

摘　　要：新安煤矿是在建矿井,煤系地层属中生代地层。巷道埋深达1 000 m,不仅应力高,地质构造复杂,而且煤层顶底板以泥质岩石为主,含膨胀性矿物,岩石松散破碎、强度低。巷道开挖后,出现严重底臌、折帮和顸沉等非线性大变形破坏现象。运用工程地质学、软岩工程力学、黏土矿物学等多学科理论,采用工程地质调研、室内实验研究相结合的手段,对新安矿回风石门软岩巷道的变形破坏特征及其原因进行深入研究。研究认为:深部软岩巷道所处地质环境和围岩特征是产生非对称变形破坏的客观原因;普通支护的局限性是造成大变形破坏的主观原因。应该有针对性地采用有效支护方式,实现围岩与支护体在强度、刚度和结构变形三方面的耦合,有效控制变形,保证巷道稳定。该研究为下一步有针对性地进行支护设计提供了理论依据和指导性建议。This paper is aimed at eliminating the problems resulting from the construction of Xin＇an coal mine in the coal-bearing strata classified as the Mesozoic strata.These problems come from the complex geological structure and high stress occurring in depths of 1 000 m; the roof and floor of coal seams dominated by argillaceous rock containing swelling mineral; the surrounding rocks in loose and broken form and of lower intensity; and many destruction phenomena of non-linearity large deformation failure typical of the occurrence of serious floor heave,siding wall shrink and roof sinking due to excavation.The paper underscores an analysis of the features and causes of large deformation failure of soft rock return air roadway,using multidisciplinary theories,such as engineering geology,soft rock engineering mechanics,and clay mineralogy,coupled with many methods including engineering geomechanics analysis,indoor experimental research,and theoretical analysis.The study finds that the geological environment to which deep soft rock roadways are exposed and the characteristics of surrounding rocks objectively result in non-linearity large deformation failure; the limitation of common support subjective]y results in large deformation failure.Out of these arises the necessity of adopting an effective support pattern to achieve the coupling of surrounding rock and support body in intensity,stiffness,and structural deformation,to control the deformation,and to ensure the safety of the roadway.The finding may provide theoretical foundation and guidance for the next support design in Xin＇an coal mine.

关 键 词：深部 软岩巷道 破坏机理 大变形 

分 类 号：TD353[矿业工程—矿井建设]