EFFECT OF CRACK-STOPPING HOLE ON SHEAR FRACTURE OF ROCK
Effect of crack-stopping hole on shear (Mode II) fracture of rock is studied numerically and experimentally. Finite element method through the displacement approach is used to calculate the shear stress intensity factors of the specimens with and without symmetrical double holes, K11 and K110. Shear-box test and new electrometnc method with conductive glue are adopted to measure the maximum shear stress intensity factor (A110), stable shear crack propagation rate (V) and time (T) of these specimens in order to find out optimal double holes for shear crack-stopping. Results show that the effect of crack-stopping hole on shear fracture of rock specimen depends on its location and size, which can be denoted by a regression equation about the ratio of K11/K110 and the three parameters, radius (R), distance away from the notch tip (I) and distance between the two holes (5). The more the R and L, the larger the K11/K110 and the easier to fracture the rock specimen. However, the more the S, the smaller the K11/K110 and the more difficult to propagate the shear crack. When R and L are the smallest and S is the largest, the specimen with double holes has the largest values of A110 and T and the smallest value of V, which is most favourable to shear crack-prcvcnting. Adding optimal double holes symmetrical with respect to the original crack plane is an effective method for shear crack arresting of brittle rock.
QIUHUA RAO HAIFENG XIE QIANG XIE ZHI WANG
College of Civil Engineering and Architecture, Central South University Changsha, Hunan, 410083, P.R.China
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
1581-1586
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）