侧部承压溶洞与深埋隧道间隔水岩体安全厚度研究

乔栋磊; 李文杰; 安艳军; 梁斌

doi:10.11988/ckyyb.20221651

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raybet体育在线院报 ›› 2024, Vol. 41 ›› Issue (5) : 162-170. DOI: 10.11988/ckyyb.20221651

岩土工程

侧部承压溶洞与深埋隧道间隔水岩体安全厚度研究

乔栋磊¹, 李文杰¹, 安艳军², 梁斌¹

作者信息 +

Safe Thickness of Water-proof Rock Mass between Side Karst Cave with Pressurized Water and Deep-buried Tunnel

QIAO Dong-lei¹, LI Wen-jie¹, AN Yan-jun², LIANG Bin¹

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文章历史 +

摘要

为保证深埋隧道安全通过侧部高压富水溶洞区段,在隧道突水发生机制分析与隔水岩体最小安全厚度划分的基础上,结合突变理论、鲁宾涅特方程及相关工程经验对隧道边墙岩体安全厚度进行研究,导出最小安全厚度计算公式,建立突水判据,分析相关影响因素对隧道边墙隔水岩体最小安全厚度的影响规律。结果表明:隔水岩体最小安全厚度H_min与围岩力学参数弹性模量E、内摩擦角φ呈正相关,与溶洞水压力q_w、岩梁跨度L及隧道埋深h呈负相关;各因素对H_min影响程度由大到小依次为h、φ、E、L与q_w,其中h与φ影响程度相近,E在超过3 GPa的情况下H_min变化趋于平缓,E的影响程度与L相近;结合有限元模拟结果和工程实例分析,验证了H_min理论计算公式及突水判据的准确性与可行性,对相关工程建设具有指导意义。

Abstract

To ensure the safe passage of deep-buried tunnels through sections characterized by high-pressure water-rich karst caves, we investigated into the water inrush mechanism of the tunnel and determined the minimum safe thickness of waterproof rock mass. Based on the catastrophe theory, the Rubinett equation, and engineering experiences, we derived a calculation formula for the minimum safe thickness and established a water inrush criterion. We also scrutinized the influence of pertinent factors on the minimum safe thickness of the tunnel sidewall’s waterproof rock mass. Results indicate a positive correlation between the minimum safe thickness of the waterproof rock mass (H_min) and the mechanical parameters of surrounding rock, including elastic modulus (E) and internal friction angle (φ), while a negative correlation with the water pressure within the karst cave (q_w), the span of the rock beam (L), and the burial depth of tunnel (h). The influence of each factor on H_min ranks in an order of h, φ, E, L, and q_w from greatest to least, with h and φ exhibiting similar degrees of influence. Moreover, when E exceeds 3 GPa, the change in H_min tends to be stable, akin to the influence of L. Finite element simulations and empirical examples align with theoretical calculations, confirming the accuracy and applicability of the derived H_min theoretical calculation formula and the water inrush criterion. This synthesis of theoretical and empirical evidence offers guidance for relevant engineering endeavors.

导出引用

乔栋磊, 李文杰, 安艳军, 梁斌. 侧部承压溶洞与深埋隧道间隔水岩体安全厚度研究[J]. raybet体育在线院报. 2024, 41(5): 162-170 https://doi.org/10.11988/ckyyb.20221651

QIAO Dong-lei, LI Wen-jie, AN Yan-jun, LIANG Bin. Safe Thickness of Water-proof Rock Mass between Side Karst Cave with Pressurized Water and Deep-buried Tunnel[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(5): 162-170 https://doi.org/10.11988/ckyyb.20221651

中图分类号： U458

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