【摘要】：懷邵衡鐵路是國(guó)家快速客運(yùn)通道之一,線路在湖南雪峰山地區(qū)主要以隧道方式穿越。由于隧道穿越區(qū)屬構(gòu)造侵蝕中低山區(qū),地形起伏多變,山體高程相對(duì)高差大。根據(jù)前期勘察資料和該地區(qū)在建隧道施工中出現(xiàn)的局部作業(yè)面燃燒現(xiàn)象,判斷瓦斯來源于頁(yè)巖氣。頁(yè)巖氣的存在不僅影響懷邵衡鐵路隧道工程設(shè)計(jì)的標(biāo)準(zhǔn),而且對(duì)其后期工程建設(shè)與運(yùn)營(yíng)的安全、順利進(jìn)行會(huì)產(chǎn)生較大的影響。本文選取穿越雪峰山地區(qū)的五座頁(yè)巖氣隧道為研究對(duì)象,通過對(duì)研究區(qū)域底層特征和構(gòu)造特征特征的分析,確定以往工程中出現(xiàn)的有害氣體(瓦斯)主要來源于頁(yè)巖氣;基于現(xiàn)場(chǎng)勘測(cè)及監(jiān)測(cè)數(shù)據(jù)分析結(jié)果,并結(jié)合前人研究成果確定了測(cè)試頁(yè)巖氣的工作手段和方法,采用野外地質(zhì)調(diào)查、巖層樣品分析、鉆探、鉆孔瓦斯測(cè)試、測(cè)井、錄井及現(xiàn)場(chǎng)解吸的方式,對(duì)懷邵衡鐵路雪峰山地區(qū)鉆孔進(jìn)行頁(yè)巖氣測(cè)試與分析;在此基礎(chǔ)上結(jié)合以往類似工程案例的對(duì)比分析,對(duì)懷邵衡鐵路穿越該地區(qū)的5座隧道的設(shè)計(jì)標(biāo)準(zhǔn)與后期施工中應(yīng)采取的工程防范措施的制定提供了參考意見。監(jiān)測(cè)分析結(jié)果表明:懷邵衡鐵路隧道通過湘西雪峰山地區(qū)的寒武系牛蹄塘組、奧陶系地層存在有害氣體,其頁(yè)巖氣濃度、有機(jī)碳含量、成熟度、干酪根類型、滲透率等指標(biāo)達(dá)到頁(yè)巖氣相關(guān)形成、儲(chǔ)集、釋放、運(yùn)移條件。懷邵衡鐵路雪峰山地區(qū)的涼山隧道西線方案、南雪峰山隧道等2座隧道頁(yè)巖氣含量較小,隧道施工和運(yùn)營(yíng)安全基本不會(huì)受到影響,但在在隧道施工需中加強(qiáng)超前預(yù)測(cè)預(yù)報(bào)、瓦斯檢測(cè)和施工通風(fēng);涼山隧道東線方案、倉(cāng)鉗嶺隧道和臘樹角隧道等3座隧道頁(yè)巖氣含量較大,應(yīng)參照現(xiàn)行瓦斯規(guī)范按低瓦斯隧道進(jìn)行設(shè)計(jì),在隧道施工過程中要加強(qiáng)超前地質(zhì)預(yù)報(bào)、加強(qiáng)瓦斯檢測(cè),有效預(yù)防工程風(fēng)險(xiǎn),并加強(qiáng)施工通風(fēng),以稀釋瓦斯?jié)舛�、減少瓦斯積聚,有效消除其對(duì)工程危害,防止重大災(zāi)害發(fā)生,確保隧道施工和運(yùn)營(yíng)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.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U456.3

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本文編號(hào)：2333584