分形节理抗剪强度尺寸效应的数值试验  

Numerical Test for Size Effect of Shear Strength of Fractal Joints

作　　者：徐磊[1] 任青文[2] 

机构地区：[1]河海大学水利水电工程学院,江苏南京210098 [2]河海大学土木工程学院,江苏南京210098

出　　处：《采矿与安全工程学报》2007年第4期405-408,共4页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(50539030)

摘　　要：为了研究岩石节理抗剪强度参数取值中的尺寸效应问题,采用随机分形方法,重构了岩石节理剖面线,在此基础上,应用数值直剪试验方法,研究了不同分维值岩石分形节理抗剪强度参数随节理尺寸的变化规律.数值直剪试验结果表明:岩石分形节理存在消除抗剪强度参数尺寸效应的临界节理尺寸(CJS).以分维值为1.1,1.2,1.3的岩石分形节理为例,得出其抗剪强度参数CJS分别为60,70,80 cm.节理剖面线分维值越大,分形节理抗剪强度参数的尺寸效应就越显著,临界节理尺寸也越大.For the purpose of investigating the size effect of shear strength parameters of rock joints, the profile of rock joints were reconstructed based on the random fractal method. The variation regularity of joint size and the shear strength of fractal rock joints with different fractal dimensions were subsequently studied by using the numerical direct shear test method. The results show that there exists a critical joint size （CJS） by which the size effect of the shear strength parameters of fractal rock joints can be eliminated. Take the fractal rock joints with fractal dimensions 1.1, 1.2, and 1.3 for example, the value of the shear strength parameters were obtained as 60, 70, and 80 cm, respectively. Therefore, with the increase of fractal dimension of rock joint, the size effect becomes more obvious and the critical joint size develops larger.

关 键 词：分形节理 抗剪强度参数 临界节理尺寸 数值试验 

分 类 号：TD313[矿业工程—矿井建设]