高水压基岩竖井井壁模型试验研究  

MODEL TEST RESEARCH ON SHAFT LINING BUILT IN HIGH PRESSURE ROCK AQUIFER

作　　者：周晓敏[1] 周国庆[2] 胡启胜[1] 马成炫[1] 

机构地区：[1]北京科技大学土木与环境学院,北京100083 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008

出　　处：《岩石力学与工程学报》2011年第12期2514-2522,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金重点项目(50534040)

摘　　要：针对西部地区煤矿井筒建设的含水基岩条件,研究基于围岩、井壁、水相互作用的井筒稳态模型试验准则关系;参考无限围岩中井筒平面应变力学模型,开发井筒模型试验系统,重点介绍自重应力场和孔隙静水压力两大加载系统及其结构和技术;根据L9(34)正交表,完成高水压基岩井筒模型的正交试验,根据正交统计分析方法,得出影响井壁内缘位移的第一、二、三、四因素依次为静水压力、围岩厚度、剪切模量和井壁厚度;通过模型试验过程观察和数据分析,掌握高水压基岩井壁内外缘位移和应变基本规律;通过井壁破坏过程分析得知,在破坏前,井壁内缘压应变逐渐加快的同时,井壁外缘由拉应变急剧转为压应变,并最终发展到突然断裂突水,呈现脆性机制特征,这种现象有待深入研究。In light of the aquifer rock condition of coal mines western in China, the relationship of similarity criterion related to steady model tests of interaction of water, surrounding rock and shaft lining are firstly studied. Then the shaft test device have been developed according to the mechanical model of plane strain shaft in infinite ground, showing especially in the aspects of structure and technology of gravity loading and pore water pressure loading system. According to the orthogonal tests table of L9（3^4）, a series of tests of shaft system under high water pressure are carried out. Upon the analysis theory of orthogonal tests, the sequences of factors which influence the inner side displacement of shaft lining are revealed as follows： the first is water pressure, the second is the thickness of surrounding rock and the third is shearing modulus; lining thickness is listed as the 4th influencing factor. Through monitoring and data study during testing process, the basic laws of inner side displacement and hoop strain of concrete lining developed by high water pressure are revealed. As the rupture state is coming in the testing process, compression deformation speeds up in the inner side of shaft lining, while the outer side of lining is under a sharp change from the state of hoop tension to compression, showing a brittle failure behavior of plain concrete. This newly discovery is worth further exploring.

关 键 词：采矿工程 井壁 模型试验 高水压 混凝土衬砌 流固耦合 

分 类 号：TD32[矿业工程—矿井建设]