大断面隧道穿越小夹角煤层施工中的瓦斯运移规律研究  

Study on gas migration law in construction of large section tunnel crossing small included angle coal seam

作　　者：李丹 黄飞 李树清[1,3] 曹安 朱云涛[4] 刘勇 王荣荣[1] Li Dan;Huang Fei;Li Shuqing;Cao An;Zhu Yuntao;Liu Yong;Wang Rongrong(School of Resource,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Henan Polytechnic University,Jiaozuo 454003,China;The SAWS Laboratory of Prevention and Controlling the Roof,Coal and Gas Outburst in Coal Mine of South China,Hunan University of Science and Technology,Xiangtan 411201,China;China Jiaotong Bridge South Engineering Co.,Ltd.,Beijing 101149,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [2]河南理工大学河南省瓦斯地质与瓦斯治理重点实验室——省部共建国家重点实验室培育基地,河南焦作454003 [3]湖南科技大学南方煤矿顶板及煤与瓦斯突出灾害预防控制应急管理部重点实验室,湖南湘潭411201 [4]中交路桥南方工程有限公司,北京101149

出　　处：《能源与环保》2022年第4期269-275,共7页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家自然科学基金青年项目(51804115);湖南省教育厅科学研究项目优秀青年项目(19B201)。

摘　　要：为探明大断面隧道在通过煤层夹角比较小施工过程中的瓦斯保护与运移扩散规律,以某在建瓦斯隧道为施工背景,构建了隧道通风的三维数值模拟,并借助流体计算软件Fluent进行模拟计算。深入研究了通风时间、瓦斯的涌出情况以及风速高低等多种因素,对瓦斯扩散的影响规律。研究结果表明,不同的通风时间,检查瓦斯在隧道内的总体分布规律,瓦斯呈现上部分瓦斯浓度大,下部分浓度较低,符合实际情况;瓦斯涌出位置不同,瓦斯在隧道内的分布不同,在持续通风的作用下,距释放源越远,瓦斯含量就越小,气体含量所达到的峰值也越慢;风速越高,瓦斯气体的排放隧道速度越快,气体含量峰值也越小。In order to ascertain the gas protection and migration and diffusion laws of large-section tunnels during the construction of relatively small angles through coal seams,this paper uses a gas tunnel under construction as a construction background to construct a three-dimensional numerical simulation of tunnel ventilation,and uses the fluid calculation software Fluent Perform simulation calculations.The influence of ventilation time,gas emission and wind speed on gas diffusion is deeply studied.The results show that the overall distribution law of gas in the tunnel is checked at different ventilation times.The gas concentration in the upper part is large and that in the lower part is low,which is in line with the actual situation.The location of gas emission is different,and the distribution of gas in the tunnel is different.Under the effect of continuous ventilation,the farther away from the release source,the smaller the gas content and the slower the peak gas content.The higher the wind speed,the faster the gas discharge tunnel speed,and the smaller the peak gas content.

关 键 词：大断面隧道 释放源 瓦斯排放 数值模拟 风速 

分 类 号：TD712.6[矿业工程—矿井通风与安全]