岩土力学2017，Vol.38Issue(12)：3573-3580,3589,9.DOI:10.16285/j.rsm.2017.12.023
冻结条件下平行双裂隙岩体力学特性试验研究
Experimental study on mechanical characteristics of two parallel fractured rock under frozen condition
摘要
Abstract
Cracks significantly influence the stability of rock engineering,and two parallel cracks are the severe distribution forms of cracks.A series of triaxial compression tests were conducted on sandstone specimens with two parallel cracks to investigate the effect of fracture morphology on its mechanical properties and failure modes.The results showed that strength,elastic modulus and Poisson's ratio of fractured rock were influenced by both the trace length and the trace length ratio.It was also found that these parameters decreased first,then increased immediately with dip increments,and less varied with spacing between cracks.When the dip angle was less than 30°,the failure plane initiated from crack tips and propagated through the rock bridge along the direction of principal stress.Shear failures localised within one crack,when the angle was between 30° and 60°.For the rock specimen with small trace length and trace length ratio (continuity ＜25％,trace length ratio ＜2.5),failure modes were not influenced by cracks.Failure modes depended on the crack with a longer trace length,when the trace length became significant (continuity degree ＞75％),but the trace length ratio remained relatively small (trace length ratio ＜1).For the rock with moderate cracks (continuity falls between 25％～75％) and the trace length ratio of approximately 1,failure modes were controlled by two cracks.关键词
平行双裂隙岩体/裂隙倾角/裂隙间距/迹长/力学性质Key words
two parallel fractured rock/fracture dip/fracture spacing/trace length/mechanical properties分类
建筑与水利引用本文复制引用
张晋勋,杨昊,单仁亮,武福美,郭志明..冻结条件下平行双裂隙岩体力学特性试验研究[J].岩土力学,2017,38(12):3573-3580,3589,9.基金项目
国家自然科学基金资助项目(No.41572270).This work was supported by the National Natural Science Foundation of China (NSFC) (41572270). （No.41572270）
