Analysis of Loose Zone in Surrounding Rock of Deep Roadway Based on Mogi-Coulomb Criterion
The analysis of the surrounding rock loose zone is an important reference in the field of coal mine support.Studying the calculation method of the radius of the loose zone as well as the influences of stress field and the lithologic parameters on the radius of the loose zone are conducive to improving the safety factor of coal mine enterprises.Based on Mogi-Coulomb criterion,the calculation formula of the radius of the surrounding rock loose zone was derived.And then Mogi-Coulomb criterion was compared with the Mohr-Coulomb criterion,Hoek-Brown criterion and unified strength theory.The applicability and advantages and disadvantages of the four criteria were analyzed and discussed.The results show that the the radius of the loose zone calculated based on the Mogi-Coulomb criterion is the smallest,while that calculated based on the Hoek-Brown criterion is the largest.The combination of intermediate principal stress coefficient and cohesion has a significant impact on the radius of the loose zone.The influences of the combination of internal friction angle and cohesion,as well as the combination of internal friction angle and intermediate principal stress coefficient on the radius of the loose zone are limited.Increasing the intermediate principal stress coefficient within the range of 0.5-1,while increasing the cohesion can effectively suppress the expansion of the loose zone.
Loose zoneMogi-Coulomb criterionIntermediate principal stress coefficientCohesion
万方数据
维普
