Abstract:The piecewise seepage characteristics of closed tensile fracture and loading history effect were investigated at room temperature using cylindrical rock samples of coarse-grained marble,sandstone,limestone and fine-grained marble with self-developed radial flow system. The results show that fracture seepage can be divided into three phases of islands flow,transitional flow,and groove flow according to different contact states and watershed distributions. Flowrate per head follows an exponential function with the normal stress,and it will be significantly lower in the subsequent loading process at the same normal stress. The relationship between flowrate per head and mechanical aperture was well simulated by the power function,in which the range of index is 1.93–2.60,so that sub-cubic law could be used to describe seepage in contacted rough rock fracture;flowrate per head is significantly lower at same mechanical aperture in subsequent loading process. Moreover,there is a piecewise linear relationship between equivalent hydraulic aperture and mechanical aperture,therefore,the modified cubic law can be established in each appropriate phase. The results have some theoretical significance for calculation of rock fracture seepage.
郭保华,苏承东. 多级加载下岩石裂隙渗流分段特性试验研究[J]. 岩石力学与工程学报, 2012, 31(s2): 3787-3794.
GUO Baohua,SU Chengdong. TEST RESEARCH ON PIECEWISE SEEPAGE CHARACTERISTICS OF ROCK FRACTURE UNDER MULTISTAGE LOADINGS. , 2012, 31(s2): 3787-3794.
王 媛,速宝玉. 单裂隙面渗流特性及等效水力隙宽[J]. 水科学进展,2002,13(1):61-68.(WANG Yuan,SU Baoyu. Research on the behavior of fluid flow in a single fracture and its equivalent hydraulic aperture[J]. Advances in Water Science,2002,13(1):61-68.(in Chinese))
[3]
周创兵,叶自桐,韩 冰. 岩石节理面形态与水力特性研究[J]. 水科学进展,1997,8(3):233-239.(ZHOU Chuangbing,YE Zitong,HAN Bing. A study on configurations and hydraulic conductivity of rock joints[J]. Advances in Water Science,1997,8(3):233-239.(in Chinese))
[5]
贺玉龙,陶玉敬,杨立中. 不同节理粗糙度系数单裂隙渗流特性试验研究[J]. 岩石力学与工程学报,2010,29(增1):3 235-3 241.(HE Yulong,TAO Yujing,YANG Lizhong. Experimental research on hydraulic behaviors in a single joint with various values of JRC[J]. Chinese Journal of Rock Mechanics and Engineering,2010,29(Supp.1):3 235-3 241.(in Chinese))
Your browse does not support frame!