煤矿立井井筒冻结壁软岩力学特性试验研究  

Experimental Study on the Mechanical Properties of Soft Rock of Coal Mine Shaft Sidewalls under the Frozen Conditions

作　　者：杨更社[1] 奚家米[1] 李慧军[1] 程磊[1] 吕晓涛[1] 

机构地区：[1]西安科技大学建筑与土木工程学院,西安710054

出　　处：《地下空间与工程学报》2012年第4期690-697,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金资助项目(50974102;40872177)

摘　　要：在煤矿立井井筒建设过程中,近年来的矿井建设逐步向深厚冲积层的深井建设发展,冻结法是有效穿越不稳定深厚基岩的有效施工方法。本文以陕西彬长矿区胡家河煤矿立井冻结施工工程为背景,从主井井筒穿越的不同类型的砂岩、煤岩、和砂质泥岩为代表,进行常温(+20℃)和不同冻结温度(-5℃,-10℃,-20℃,-30℃)条件下的岩石在单轴和不同围压条件下(6 MPa,8 MPa,10 MPa)的三轴压缩试验。分别探讨了围压对于冻结软岩三轴强度特性的影响和冻结温度对于冻结软岩三轴强度特性的影响规律,分析了不同类型的砂岩、煤岩、和砂质泥岩在相同围压不同温度条件下及相同温度不同围压条件下的强度特性,并对3种软岩冻结温度效应的同一性和差异性进行比较研究。为低温条件下岩石力学特性和煤矿冻结立井设计施工提供有价值参考。With the demands of coal mine shaft construction in the soft rock passing through the thick alluvium environment, the freezing method is an effective construction method to pass through the thick alluvium, it is necessary to research the problems related to the frozen rock mechanics. Taking the frozen shaft project of Hujia River coal mine in Shaanxi Bingchang coal mine area as the project background, three different kinds of soft rock： sandstone, coal samples and sandy mudstone collected from the field the key shaft passing through, are tested under the uniaxial com- pression and tri-axial compression at different confining pressure（ 6 MPa, 8 MPa and 10 MPa） and at the room tem- perature（ ＋20 ℃ ）and different freezing temperatures（ -5 ℃, -10 ℃, -20 ℃ and -30 ℃ ）. Based on the ex- perimental results, the influential law of confining pressure and freezing temperature on the tri-axial strength properties of frozen soft rock is explored, and the strength properties of sandstone, coal samples and sandy mudstone under same confining pressure at different temperature and different confining pressure at different freezing temperature are ana- lyzed, and the identity and discrepancy of three different kinds of soft rock samples on freezing temperature is compar- atively studied. This provides some reference for studying rock mechanics under cold environment and the construc- tion and design for freezing shafts of coal mineso

关 键 词：软岩 冻结 力学特性 试验研究 

分 类 号：TU473[建筑科学—结构工程]