【摘要】 为研究含不同倾角裂隙岩石的蠕变特性,利用相似理论配制含不同倾角单裂隙类岩石,对含不同倾角单裂隙类岩石试件进行三轴蠕变试验,得到不同角度单裂隙类岩石的稳态蠕变率与稳态蠕变量,利用ANSYS软件对含不同倾角裂隙类岩石进行数值模拟并分析,得到试件的应力与应变云图和裂隙特征点的稳态蠕变量、稳态蠕变率曲线。研究发现:三轴稳态蠕变率随裂隙倾角的增大表现出先增大后减小再增大的趋势,在倾角为30°时稳态蠕变率最大,最大为2.59×10-4h-1,在倾角为75°时最小,最小为1.47×10-4h-1;试件在蠕变过程中,裂隙尖端产生应力集中现象,远离裂隙尖端的部分应力变化较均匀;运用ANSYS软件对不同裂隙倾角试件进行蠕变模拟分析发现,在30°倾角时蠕变应变量最大,在75°倾角时蠕变应变量最小,90°倾角试件与无损伤试件蠕变应变量变化较均匀。更多还原

【Abstract】 In order to study the creep characteristics of rocks with different dip angles,the similarity theory is used to prepare single crack rocks with different dip angles,and tri-axial creep tests are carried out on specimens with different dip angles to obtain the steady-state creep rate and steady-state creep variables. The stress and strain nephogram of the specimen and the steady-state creep variable and steady-state creep rate curve of the characteristic point of the crack are obtained by means of ANSYS software. It is found that the triaxial steady creep rate increased first,then decreased,and then increased with the increase of crack dip angle.When the dip angle is 30°,the steady creep rate is the highest,with a maximum of 2.59×10-4 h-1,and when the dip angle is 75°,the lowest is 1.47×10-4 h-1. In the creep process of the specimen,stress concentration occurs at the crack tip,the change of partial stress far from the crack tip is more uniform. The creep simulation analysis of specimens with different crack dip angle is conducted with ANSYS software,and it is found that the creep strain variable is the largest at 30°,the smallest at 75°,and the creep strain variable of specimens with 90°and specimens without damage changed evenly.更多还原