%0 Journal Article
%A QIAO Dong-lei
%A LI Wen-jie
%A AN Yan-jun
%A LIANG Bin
%T Safe Thickness of Water-proof Rock Mass between Side Karst Cave with Pressurized Water and Deep-buried Tunnel
%D 2024
%R 10.11988/ckyyb.20221651
%J Journal of Yangtze River Scientific Research Institute
%P 162-170
%V 41
%N 5
%X 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 (<i>H</i><sub>min</sub>) and the mechanical parameters of surrounding rock, including elastic modulus (<i>E</i>) and internal friction angle (<i>φ</i>), while a negative correlation with the water pressure within the karst cave (<i>q</i><sub>w</sub>), the span of the rock beam (<i>L</i>), and the burial depth of tunnel (<i>h</i>). The influence of each factor on <i>H</i><sub>min</sub> ranks in an order of <i>h, φ, E, L</i>, and <i>q</i><sub>w</sub> from greatest to least, with <i>h</i> and <i>φ</i> exhibiting similar degrees of influence. Moreover, when <i>E</i> exceeds 3 GPa, the change in <i>H</i><sub>min</sub> tends to be stable, akin to the influence of <i>L</i>. Finite element simulations and empirical examples align with theoretical calculations, confirming the accuracy and applicability of the derived <i>H</i><sub>min</sub> theoretical calculation formula and the water inrush criterion. This synthesis of theoretical and empirical evidence offers guidance for relevant engineering endeavors.
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20221651