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<p>Tunnels in high geothermal and water-rich areas usually encounter thermal damage and water seepage problems during the tunnel construction period. Understanding the interaction between seepage and heat transfer in the surrounding rock of the tunnel is an important prerequisite for safe tunnel construction and environmental protection. This study established the tunnelling fractured rock models by using the discrete fracture network method and numerically explored the effects of geometric characteristics of fracture network and geological factors on the hydrothermal field of the rock. By designing orthogonal experiments and analyzing orthogonal cases, the changes of rock equivalent thermal conductivity (ETC) under the combined action of multiple factors were investigated. The priority of each influencing factor on ETC is in the following order: fracture inclination, fracture intensity, water temperature, water head, fracture roughness and fracture aperture. The weighted contribution rates of each factor to the ETC are 30.6%, 24%, 18.5%, 15.5%, 6% and 5.3%, respectively. Finally, a formula including all factors to determine the equivalent thermal conductivity was proposed. The results of this study can provide reference and guidance for quantifying surrounding rock heat transfer during the construction period of high geothermal tunnels.</p>

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Numerical Simulation Analysis of the Fracture Network Geometric Characteristics’ Influences on the Hydrothermal Coupling Field and the Equivalent Thermal Conductivity of Tunnelling Fractured Rock

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • Kaiming Zhao,
  • Yanping Yuan,
  • Fujian Jiang,
  • Xiaoling Cao,
  • Wenhui Ji,
  • Yi Peng

摘要

Tunnels in high geothermal and water-rich areas usually encounter thermal damage and water seepage problems during the tunnel construction period. Understanding the interaction between seepage and heat transfer in the surrounding rock of the tunnel is an important prerequisite for safe tunnel construction and environmental protection. This study established the tunnelling fractured rock models by using the discrete fracture network method and numerically explored the effects of geometric characteristics of fracture network and geological factors on the hydrothermal field of the rock. By designing orthogonal experiments and analyzing orthogonal cases, the changes of rock equivalent thermal conductivity (ETC) under the combined action of multiple factors were investigated. The priority of each influencing factor on ETC is in the following order: fracture inclination, fracture intensity, water temperature, water head, fracture roughness and fracture aperture. The weighted contribution rates of each factor to the ETC are 30.6%, 24%, 18.5%, 15.5%, 6% and 5.3%, respectively. Finally, a formula including all factors to determine the equivalent thermal conductivity was proposed. The results of this study can provide reference and guidance for quantifying surrounding rock heat transfer during the construction period of high geothermal tunnels.