考虑岩墙厚度的大断面隧道掌子面稳定性分析

Stability Analysis of Large Section Tunnel Face Considering The thickness of Rock Wall

基于道吾山隧道施工过程中发生的突水灾害,建立了三维情况下掌子面前方岩墙的力学计算模型,推导了突泥突水下隧道掌子面岩墙厚度的计算公式,与极限分析上限法进行了对比分析,并对各计算参数的影响进行了分析;根据隧道已有的力学参数,计算了不同溶腔压力作用下,隧道掌子面前方岩墙的最小安全厚度;运用数值分析了不同岩墙厚度下隧道掌子面前方溶腔的临界压力值,通过对比分析了数值模拟结果与理论计算结果,验证了这一方法对于研究隧道前方存在有压溶腔的掌子面稳定性具有一定意义。

Based on the water inrush disaster that occurred during the construction of the DaoWuShan Tunnel,A three-dimensional mechanical calculation model of the rock wall in front of the palm face was established,and the formula for calculating the thickness of the rock wall on the palm face of the underwater mud and water tunnel was derived,Compared with the limit analysis upper limit method,and analyzed the influence of each calculation parameter;According to the existing mechanical parameters of the tunnel,the minimum safe thickness of the rock wall in front of the tunnel palm face under different pressures of the cavity is calculated;the critical pressure value of the cavity in front of the tunnel palm face under different rock wall thicknesses is analyzed numerically.By comparing and analyzing the numerical simulation results and theoretical calculation results,it is verified that this method has certain significance for studying the stability of the palm surface with a pressure-dissolving cavity in front of the tunnel.