关于公路隧道健康状况均衡评估模型的探索

Exploration on the Equilibrium Evaluation Model for the Health Status of Road Tunnels

针对目前公路隧道健康状况评估方法存在的问题,文章提出了公路隧道健康状况均衡评估模型,即通过相关物理力学参数分布的均衡性来推断公路隧道的健康状况,其中均衡性的程度按变异系数和失衡系数的大小来界定。研究表明:在足够地层抗力均布的前提下,围岩压力分布不均衡对隧道结构安全性影响不大,而地层抗力分布的均衡性对隧道结构安全性的影响比较显著;为保障隧道结构的安全性,宜令拱腰以下范围的地层抗力变异系数不大于0.5、失衡系数不大于0.3,勿使变异系数大于0.7或失衡系数大于0.6。

Aiming at the problems existing in the current evaluation methods for the health status of road tunnels,a equilibrium evaluation model is proposed which evaluates the health status of the road tunnels based on the distribution equilibrium of relevant physical and mechanical parameters,and the degree of equilibrium is defined by the coefficients of variation and imbalance.The research shows the disequilibrium of pressure distribution of surrounding rocks has little effect on safety of tunnel structure while the equilibrium of ground resistance distribution has significant effect on safety of tunnel structure under condition of uniform distribution of adequate ground resistance;in order to ensure the safety of tunnel structure,the proper coefficients of ground resistance variation and disequilibrium should be no more than 0.5,0.3 respectively and the coefficients of variation and disequilibrium must be no more than 0.7 and 0.6 respectively within the scope under the tunnel haunch.