Numerical-Experimental Analysis of the Coal Fracture Formation Mechanism Induced by Liquid CO_(2) Explosion  

作　　者：Yun Lei 

机构地区：[1]Shenyang Research Institute,China Coal Technology&Engineering Group Corp.,Fushun,113122,China [2]State Key Laboratory of Coal Mine Safety Technology,Fushun,113122,China

出　　处：《Fluid Dynamics & Materials Processing》2023年第12期3021-3032,共12页流体力学与材料加工（英文）

基　　金：supported by the National Science and Technology Major Project(Grant No.2016ZX05067004-003).

摘　　要：The highly inefficient simultaneous extraction of coal and gas from low-permeability and high-gas coal seams in deep mines is a major problem often restricting the sustainable development of coal industry.A possible way to solve this problem under deep and complex geological conditions is represented by the technology based on the phase-change induced explosion of liquid carbon dioxide.In this work,the mechanism of formation of the coal mass fracture circle resulting from the gas cracking process is theoretically analyzed.Numerical simulations show that a blasting crushing zone with a radius of 1.0 m is formed around the blasting hole.The radius of the sec-ondary expansion zone caused by the exploding gas is 2.0 m,and the extension limit of the explosion fracture is 2.3 m.The gas phase change explosion is influenced by the coal roadway driving face,the gas content index and the analytical index of coal shavings.Experiments conducted for comparison also lead to the conclusion that the initial gas emission is increased by 3.7 times from the 100-meter borehole in the original coal mass after coalbed gas explosion anti-reflection.

关 键 词：Low-permeability gas-rich carbon dioxide ANTI-REFLECTION gas explosion 

分 类 号：P61[天文地球—矿床学]