压缩载荷下孔隙结构变化的CT实验研究  

THE CT TEST FOR POROUS STRUCTURAL CHANGE UNDER COMPRESSIVE LOAD

作　　者：杨永明[1] 宋振铎 鞠杨[1] 王会杰[1] 彭瑞东[1] 

机构地区：[1]煤炭资源与安全开采国家重点实验室,中国矿业大学力学与建筑工程学院,北京100083 [2]中国煤矿机械装备有限责任公司,北京100011

出　　处：《力学与实践》2009年第5期15-20,共6页Mechanics in Engineering

基　　金：国家重大基础研究规划项目(2002CB412705);教育部“新世纪优秀人才支持计划”(NCET-05-0215);国家自然科学基金项目(50579042);国家自然科学基金创新群体项目(50221402)资助

摘　　要：为了研究孔隙对岩石力学性能的影响,利用自制的孔隙物理模型,通过单轴压缩和CT扫描实验研究了受载条件下孔隙率对岩石孔隙结构的演化及其对外部物理力学性能的影响,得到了不同加载阶段和不同CT观察尺度下孔隙模型的裂纹扩展规律以及孔隙和固体介质的损伤变化情况.实验结果表明:孔隙模型在受载条件下裂纹主要发生在峰值荷载之后,主裂纹大都集中在孔隙密集的地方且伴随许多细小裂纹的产生;峰值载荷前出现了少数微裂纹,微裂纹的产生与演化主要发生在孔隙周边.In order to investigate the influence of pores on mechanical properties of rock, porous physical models were developed, and through the uniaxial compressive and CT scanning tests, the evolution of porous structure with different porosity on rock and the influence of porous structure on macroscopical physical/mechanical properties are studied under various loading conditions. The crack growth law of pore models and the damage law of pores and solid media are obtained for different loads and CT observation scales. The test results indicate that the most of cracks appear after the peak value of tensile strength is reached. The main cracks appear in the place of densely distributed pores with many minor cracks. Before the peak value, a few minor cracks appear around pores.

关 键 词：孔隙结构 孔隙模型 CT实验 灰度 

分 类 号：TU454[建筑科学—岩土工程]