摘要
岩体中裂隙的存在严重影响着岩体的渗流特性。为了解不同载荷作用对含裂隙岩体渗流性能的影响规律,利用高精度渗流应力耦合三轴试验系统,对含裂隙砂岩和粉砂岩加载及卸载作用下的渗流特性进行试验研究。试验结果表明:(1)加载试验过程中,随着载荷的增大,试样裂隙隙宽逐渐减小,渗透率随之逐渐减小,渗透率与有效围压呈负指数关系;(2)卸载过程中,随着载荷的减小,岩石渗透率逐渐回升,但回升路径明显低于原始路径,路径不重合表明试样中裂隙的变形具有塑性变形的特征。根据试验结果,建立渗透率与有效围压的关系式,并确定关系式中的待定参数。在试验及理论研究的基础上,通过数值模拟分析试样裂隙面渗透率及渗流速度的变化规律。
The fractures existed in the rock mass influence the rock permeability significantly. In order to study the impact of different loadings on the permeability of fractured rock, a series of loading and unloading seepage tests were carried out on fractured sandstone and siltstone samples using the high-precision hydro-mechanical coupling test system. The test results show that： （1） Permeability decreased as well as the aperture of the fracture as the inflow pressure increased during the loading tests. （2） The permeability recovered gradually as the hydrostatic pressure decreased during the unloading procedures, but the recover path is lower than the original path. It shows that plastic deformation has occurred for the fractures. Based on the test results, the relationship between permeability and effective confining pressure was established. Moreover, based on the experiments and theory, the
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2012年第A01期2788-2795,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金重大国际合作项目(50720135906)
国家自然科学基金资助项目(51109207)
交通运输部行业科技攻关项目
关键词
岩石力学
含裂隙岩石
渗透率
渗流试验
数值模拟
rock mechanics
fractured rock
permeability
seepage tests
numerical simulation
