湖南雪峰山地区隧道页岩气测试与评价
发布时间：2018-11-15 14:38
【摘要】：怀邵衡铁路是国家快速客运通道之一,线路在湖南雪峰山地区主要以隧道方式穿越。由于隧道穿越区属构造侵蚀中低山区,地形起伏多变,山体高程相对高差大。根据前期勘察资料和该地区在建隧道施工中出现的局部作业面燃烧现象,判断瓦斯来源于页岩气。页岩气的存在不仅影响怀邵衡铁路隧道工程设计的标准,而且对其后期工程建设与运营的安全、顺利进行会产生较大的影响。本文选取穿越雪峰山地区的五座页岩气隧道为研究对象,通过对研究区域底层特征和构造特征特征的分析,确定以往工程中出现的有害气体(瓦斯)主要来源于页岩气;基于现场勘测及监测数据分析结果,并结合前人研究成果确定了测试页岩气的工作手段和方法,采用野外地质调查、岩层样品分析、钻探、钻孔瓦斯测试、测井、录井及现场解吸的方式,对怀邵衡铁路雪峰山地区钻孔进行页岩气测试与分析;在此基础上结合以往类似工程案例的对比分析,对怀邵衡铁路穿越该地区的5座隧道的设计标准与后期施工中应采取的工程防范措施的制定提供了参考意见。监测分析结果表明:怀邵衡铁路隧道通过湘西雪峰山地区的寒武系牛蹄塘组、奥陶系地层存在有害气体,其页岩气浓度、有机碳含量、成熟度、干酪根类型、渗透率等指标达到页岩气相关形成、储集、释放、运移条件。怀邵衡铁路雪峰山地区的凉山隧道西线方案、南雪峰山隧道等2座隧道页岩气含量较小,隧道施工和运营安全基本不会受到影响,但在在隧道施工需中加强超前预测预报、瓦斯检测和施工通风;凉山隧道东线方案、仓钳岭隧道和腊树角隧道等3座隧道页岩气含量较大,应参照现行瓦斯规范按低瓦斯隧道进行设计,在隧道施工过程中要加强超前地质预报、加强瓦斯检测,有效预防工程风险,并加强施工通风,以稀释瓦斯浓度、减少瓦斯积聚,有效消除其对工程危害,防止重大灾害发生,确保隧道施工和运营安全。
[Abstract]:Huai Shao Heng Railway is one of the national express passenger channels, which is mainly passed through by tunnel in Xuefeng Mountain area of Hunan Province. Because the tunnel crossing area belongs to the middle and low mountain area of structural erosion, the topography is fluctuant, and the elevation difference of the mountain body is large. According to the Prophase investigation data and the burning phenomenon of local work surface in the construction of the tunnel under construction in this area, it is judged that the gas originates from shale gas. The existence of shale gas not only affects the design standard of railway tunnel, but also has a great influence on the safety of construction and operation in the later stage. In this paper, five shale gas tunnels passing through Xuefeng Mountain area are selected as the research objects. Through the analysis of the bottom layer characteristics and structural characteristics of the study area, it is determined that the harmful gases (gas) in the previous projects are mainly derived from shale gas. Based on the results of field survey and monitoring data, and combining with the previous research results, the working methods and methods of shale gas testing are determined. Field geological survey, rock sample analysis, drilling, borehole gas testing and logging are adopted. The mud logging and desorption methods were used to test and analyze the shale gas in Xuefeng Mountain area of Huai Shaoheng Railway. On the basis of the comparison and analysis of similar engineering cases in the past, the paper provides a reference for the design standard of 5 tunnels crossing this area by Huaishaoheng railway and the formulation of the engineering preventive measures to be taken in the later period of construction. The results of monitoring and analysis show that there are harmful gases in Ordovician strata through the Huai Shaoheng Railway Tunnel in the Xuefeng Mountain area of western Hunan, and the shale gas concentration, organic carbon content, maturity, and kerogen type exist in the Ordovician strata. Permeability and other indicators reach shale gas related formation, reservoir, release, migration conditions. The west route scheme of Liangshan Tunnel in Xuefengshan area of Huaishao-Shaoheng Railway, the shale gas content of two tunnels such as the South Xuefeng Mountain Tunnel is small, the tunnel construction and operation safety will not be affected basically, but in the tunnel construction need to strengthen the advance forecast, Gas detection and construction ventilation; The three tunnels of Liangshan Tunnel, Cangtangling Tunnel and Lashujiao Tunnel, which have a large shale gas content, should be designed according to the current gas code according to the low gas tunnel, and the geological forecast should be strengthened in the course of tunnel construction. Strengthen gas detection, effectively prevent engineering risk, and strengthen construction ventilation to dilute gas concentration, reduce gas accumulation, effectively eliminate its harm to engineering, prevent the occurrence of major disasters, and ensure the safety of tunnel construction and operation.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U456.3
本文编号：2333584
[Abstract]:Huai Shao Heng Railway is one of the national express passenger channels, which is mainly passed through by tunnel in Xuefeng Mountain area of Hunan Province. Because the tunnel crossing area belongs to the middle and low mountain area of structural erosion, the topography is fluctuant, and the elevation difference of the mountain body is large. According to the Prophase investigation data and the burning phenomenon of local work surface in the construction of the tunnel under construction in this area, it is judged that the gas originates from shale gas. The existence of shale gas not only affects the design standard of railway tunnel, but also has a great influence on the safety of construction and operation in the later stage. In this paper, five shale gas tunnels passing through Xuefeng Mountain area are selected as the research objects. Through the analysis of the bottom layer characteristics and structural characteristics of the study area, it is determined that the harmful gases (gas) in the previous projects are mainly derived from shale gas. Based on the results of field survey and monitoring data, and combining with the previous research results, the working methods and methods of shale gas testing are determined. Field geological survey, rock sample analysis, drilling, borehole gas testing and logging are adopted. The mud logging and desorption methods were used to test and analyze the shale gas in Xuefeng Mountain area of Huai Shaoheng Railway. On the basis of the comparison and analysis of similar engineering cases in the past, the paper provides a reference for the design standard of 5 tunnels crossing this area by Huaishaoheng railway and the formulation of the engineering preventive measures to be taken in the later period of construction. The results of monitoring and analysis show that there are harmful gases in Ordovician strata through the Huai Shaoheng Railway Tunnel in the Xuefeng Mountain area of western Hunan, and the shale gas concentration, organic carbon content, maturity, and kerogen type exist in the Ordovician strata. Permeability and other indicators reach shale gas related formation, reservoir, release, migration conditions. The west route scheme of Liangshan Tunnel in Xuefengshan area of Huaishao-Shaoheng Railway, the shale gas content of two tunnels such as the South Xuefeng Mountain Tunnel is small, the tunnel construction and operation safety will not be affected basically, but in the tunnel construction need to strengthen the advance forecast, Gas detection and construction ventilation; The three tunnels of Liangshan Tunnel, Cangtangling Tunnel and Lashujiao Tunnel, which have a large shale gas content, should be designed according to the current gas code according to the low gas tunnel, and the geological forecast should be strengthened in the course of tunnel construction. Strengthen gas detection, effectively prevent engineering risk, and strengthen construction ventilation to dilute gas concentration, reduce gas accumulation, effectively eliminate its harm to engineering, prevent the occurrence of major disasters, and ensure the safety of tunnel construction and operation.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U456.3
【参考文献】
相关期刊论文 前1条
1 侯读杰;包书景;毛小平;陈新军;马宁;张小涛;杨光庆;孙超;;页岩气资源潜力评价的几个关键问题讨论[J];地球科学与环境学报;2012年03期
，本文编号：2333584
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2333584.html
