Catastrophic mechanism of coal and gas outbursts and their prevention and control

作     者：LI, Shugang ZHANG, Tianjun 

作者机构：college of energyxi'an university of science and technologyxi'an 710054china college of sciencexi'an university of science and technologyxi'an 710054china 

出 版 物：《Mining Science and Technology》 (矿业科学技术（英文版）)

年 卷 期：2010年第20卷第2期

页      面：209-214页

核心收录：

学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学] 

基　　金：provided by the National Natural Science Foundation of China (Nos.50574072, 50874089 and 50534049) the Special Scientific Foundation of the Shaanxi Department of Education (No.08JK366) is gratefully acknowledged 

主　　题：coal and gas outbursts catastrophe theory instability 

摘      要：Based on the engineering observations of coal and gas outbursts during mining processes and the experimental results,we built a thin plate mechanical model for layered and spalled coal *** studied the mechanical mechanism of outbursts,due to instability,of thin plates of coal rocks under the action of in-plane load and normal load,by using the catastrophe *** total potential function is derived for the layered rock system,the cusp catastrophe model for the system is established,the bifurcation set that makes the system unstable is given,the process in which gradual change of action forces leads to catastrophic change of state is analyzed,and the effect of movement path of point(P,q) in the control space on the stability of rock plate is *** study results show that during the process of coal mining,the stability of the layered coal bodies depends not only on its physical properties and dimensions but also on the magnitudes and changing paths of the in-plane load and the normal *** the gas in the coal bodies ahead of the mining face is pre-drained,the gas pressure can be reduced and the normal load q can be ***,disasters such as coal and gas outbursts can be effectively prevented.