含裂隙围岩瓦斯突出判别方法  

Identification method of tunnel gas outburst considering fractured surrounding rock

作　　者：黄道秋 HUANG Daoqiu(China Communications Road and Bridge Construction Co.,Ltd.,Beijing 101121,China)

机构地区：[1]中交路桥建设有限公司,北京101121

出　　处：《水利水电技术（中英文）》2022年第S01期267-272,共6页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(51478073)

摘　　要：为了建立考虑爆破作用的隧道瓦斯突出判别方法,首先将隧道瓦斯突出分为了空腔型瓦斯突出和裂缝型瓦斯突出两种物理模型。考虑隧道施工爆破荷载的作用,分别基于结构力学和断裂力学构建了两种瓦斯突出物理模型的力学模型,并建立了两种力学模型瓦斯突出的判别方法和裂缝型瓦斯突出模型中裂缝失稳稳定系数和临界瓦斯压力的计算方法。然后揭示了不同裂缝长度、爆破距离、炸药量、入射角和瓦斯压力条件下的瓦斯突出规律,并通过分析发现裂缝的稳定系数随着爆破距离的增加而增大,随着炸药量、裂缝长度、入射角和瓦斯压力的增大而迅速减小。最后基于双变量改变下裂缝稳定系数的变化云图可知炸药量、裂缝长度和瓦斯压力对裂缝稳定系数的影响都较大,其中瓦斯压力对裂缝稳定系数的影响最为显著。研究成果可为确保含煤系地层山岭隧道开挖时的地质安全提供依据。In order to establish the identification method of tunnel gas outburst considering the blasting effect,this paper divides the tunnel gas outburst into two physical models:cavity type gas outburst and fracture type gas outburst.Considering the action of blasting load in tunnel construction,two physical models of gas outburst are constructed based on structural mechanics and fracture mechanics,and methods for identifying gas outburst in the two mechanical models and calculation methods of the stability coefficient of fracture instability and critical gas pressure in fracture type gas outburst models are established.And then it reveals the law of gas outburst under the condition of the different crack length,explosive distance,explosive charge,incident angle and gas pressure,then through the analysis we find that the stability coefficient of crack increases with the increasing of explosive distance and decreases rapidly with the increasing of explosive charge,crack length,incident angle and gas pressure.Finally,based on the cloud picture of the change of crack stability coefficient under the bivariate change,it can be seen that the explosive charge,crack length and gas pressure have great influences on the crack stability coefficient,among which the gas pressure has the most significant influence on the crack stability coefficient.The research results of this paper can provide a basis for ensuring the geological safety of mountain tunnel excavation in coal-bearing strata.

关 键 词：隧道工程 瓦斯突出 爆破 断裂力学 稳定性 

分 类 号：TD713[矿业工程—矿井通风与安全]