%0 Journal Article
%A NIU Jiang rui
%A YAO Chi
%A YANG Jian hua
%A ZHOU Chuang bing
%T Numerical Study on Strength and Crack Coalescence Behavior ofSandstone Containing Two Pre-existing Non-coplanar FissuresBased on Improved Rigid Body Spring Method
%D 2017
%R 10.11988/ckyyb.20160591
%J Journal of Yangtze River Scientific Research Institute
%P 102-106
%V 34
%N 10
%X In order to study the strength and crack coalescence behavior of sandstone containing two pre-exisiting non-coplanar fissures, a modified Rigid Body Spring Method is proposed to simulate the process of uniaxial compression tests, and a set of micro-parameters calibrated by uniaxial compression laboratory test results was used to set up a model of  fissured rock samples containing  two pre-exisiting non-coplanar fissures. On the basis of the simulated results, the influence of rock bridge inclination on crack initiation stress, peak strength, failure mode and crack coalescence behavior was investigated. Results show that crack initiation stress and peak strength both decreased in the presence of a rock bridge inclination smaller than 60°, and vice versa. According to the differences of the rock bridge inclination, the failure mode of specimens could be divided into three types: the penetration  failure of single wing crack, the penetration  failure of the coalescence of wing crack and the penetration  failure of the coalescence between wing crack and prefabricated fissures. Rock bridge inclination has some impact on the failure degree of the rock bridge, and it is easy to coalesce for 60° rock bridge but hard for 0° and 120° rock bridge.
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20160591