摘要
断层是影响隧道掘进过程安全性的重要因素,其煤岩完整性的破坏致使瓦斯运移条件发生了变化。为研究逆断层隧道掘进过程中岩石的动态破坏过程和煤岩瓦斯的渗流-应力-损伤耦合作用,结合兴隆坪隧道的实际地质资料,建立了数值计算模型。利用RFPA2D-GasFlow软件,模拟了瓦斯压力为2.0 MPa工况下隧道掘进过程中断层破碎带附近岩体的应力分布特征。其模拟结果将瓦斯突出破坏过程分应力增加阶段、断层破裂阶段和应力致使瓦斯突出阶段,得到了瓦斯流量等值线分布的变化规律。指出了逆断层下盘隧道掘进临近断层过程中,断层活化及裂隙贯通区是瓦斯突出危险时刻,并对隧道掘进过程致使煤岩体损伤-破坏-裂隙贯通-瓦斯突出全过程进行了分析。
The fault is an important factor that affects the safety of tunnel excavation, the destruction of coal and rock integrity leads to the change of gas migration conditions. On the basis of considering the dynamic failure process of rock and the seepage- stress-damage coupling of gas coal and rock, combining with the actual geological conditions of the Xinglongping Tunnel, the numerical model is established. RFPA2D-GasFlow software is used to simulate the stress distribution characteristics of the rock mass near the fracture zone of the tunnel under the condition of 2.0 MPa gas pressure. The simulation results show that the failure process of gas outburst can be divided into stages of stress increase, fault rupture and gas outburst induced by stress, the variation law of gas flow isoline distribution is obtained. In the process of the fault footwall tunnel approaching the inverse fault, the activation and fissure zone is dangerous moment for gas outburst, and the tunnel excavation process in coal rock damage and fracture through the whole process of gas outburst are analyzed.
作者
杨雪飞
Yang Xuefei(China Railway 19th Bureau Group 5th Engineering Co. Ltd. , Dalian Liaoning 116000, China)
出处
《铁道建筑技术》
2017年第11期88-91,111,共5页
Railway Construction Technology
基金
中铁十九局集团有限公司科技研发项目(17-4A)
