李馨芳, 张晓平, 唐少辉, 等. 2022. 富含生物成因气体地层盾构掘进克泥效的密封阻隔效应研究[J]. 工程地质学报, 30(5): 1721-1730. doi: 10.13544/j.cnki.jeg.2022-0295.
    引用本文: 李馨芳, 张晓平, 唐少辉, 等. 2022. 富含生物成因气体地层盾构掘进克泥效的密封阻隔效应研究[J]. 工程地质学报, 30(5): 1721-1730. doi: 10.13544/j.cnki.jeg.2022-0295.
    Li Xinfang, Zhang Xiaoping, Tang Shaohui, et al. 2022. Research on the sealing and blocking effect of clay shock during biogenic gas-rich ground tunneling using shield TBM [J]. Journal of Engineering Geology, 30(5): 1721-1730. doi: 10.13544/j.cnki.jeg.2022-0295.
    Citation: Li Xinfang, Zhang Xiaoping, Tang Shaohui, et al. 2022. Research on the sealing and blocking effect of clay shock during biogenic gas-rich ground tunneling using shield TBM [J]. Journal of Engineering Geology, 30(5): 1721-1730. doi: 10.13544/j.cnki.jeg.2022-0295.

    富含生物成因气体地层盾构掘进克泥效的密封阻隔效应研究

    RESEARCH ON THE SEALING AND BLOCKING EFFECT OF CLAY SHOCK DURING BIOGENIC GAS-RICH GROUND TUNNELING USING SHIELD TBM

    • 摘要: 富含生物成因气体地层盾构隧道施工风险高,气体极易通过开挖舱、泥浆管、盾尾间隙和管片节间渗入盾构和隧道内部,引发燃爆事故威胁施工安全。为了密封阻隔生物成因气体的泄漏通道,克泥效被用于填充中盾和洞壁之间的开挖间隙。本研究针对盾构掘进过程中生物成因气体的密封阻隔问题,提出了一种克泥效密封阻隔生物成因气体试验装置与方法,研究了克泥效注入厚度与气体击穿时间的相关关系,揭示了生物成因气体在克泥效中的渗透扩散机制,并依托苏通GIL综合管廊工程验证了克泥效密封阻隔生物成因气体的作用效果。研究结果表明:气体击穿时间随克泥效注入厚度的增加近似线性增长;当克泥效注入厚度为30 mm时,平均击穿时间为51.5 min,超过单环管片拼装所需最长时间50 min,满足苏通GIL综合管廊工程施工需求。现场气体监测结果表明,相较于注入克泥效填充开挖间隙之前,注入克泥效后CH4和CO浓度均在允许范围内,克泥效有效阻隔了生物成因气体进入盾构隧道内部。相关研究结果可为类似工程地质条件下生物成因气体防治提供理论依据和技术支撑。

       

      Abstract: Shield tunnel construction in the biogenic gas-rich ground is a dangerous procedure. Biogenic gas is prone to penetrate shield TBM and shield tunnel through excavation cabin, slurry pipeline, tail clearance and segment clearance. It will induce combustion and explosion accidents and threaten the construction safety of shield tunnels. To seal and block the leakage of biogenic gas, clay shock is utilized to fill the gap between the middle shield and tunnel wall. In this study, aiming at the sealing and blocking problem of biogenic gas in the process of shield tunneling, a test apparatus and test method for analyzing the sealing and blocking effect of clay shock on biogenic gas have been developed. The correlation between clay shock injection thickness and gas breakdown time has been studied. The permeation mechanism of biogenic gas has been revealed. The application effect of clay shock in Sutong GIL Yangtze River Crossing Cable Tunnel has been verified. The results indicate that the gas breakdown time increases linearly with the increase of clay shock thickness. When clay shock thickness is 30 mm, the average breakdown time is 51.5 min, which exceeds the longest time required for single-ring segment assembly by 50 min and meets the requirements of the Sutong GIL Yangtze River Crossing Cable Tunnel. Field gas monitoring results indicate that when the excavation gap is filled with clay shock during shield tunnel construction, the concentration of CH4 and CO are within the allowable range and clay shock achieves the sealing and blocking effect compared to the absence of biogenic gas prevention measures. The presented study provides a theoretical basis and technical support for the prevention and control of biogenic gas in similar engineering geological conditions.

       

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