China Railway First Survey and Design Institute Group Co,Ltd,Xi’an
确定围岩压力是隧道支护结构设计的前提，而围岩位移则是支护结构有效性的直接表征。基于统计的59座山岭隧道248个断面围岩压力和变形监测数据，全面分析了软弱隧道围岩压力和变形演化特征及其动态作用关系。研究结果表明：水平压力主要集中于中低值区间；垂直压力多集中于低值区间，分布离散性明显；两个方向上的压力在稳定时间的中低值区间内分布无显著差异。水平和竖向围岩变形均集中于中低值区；约80%的围岩压力和变形数据小于400 kPa和400 mm。归一化围岩压力与变形的时间发展特征表明，深浅埋隧道压力和变形均表现为“初始变化—急剧变化—变化减缓—变化稳定”的四阶段演化特征，垂直压力发展速率大于水平压力，拱顶初支受力快而边墙受力慢。深浅埋归一化垂直围岩压力随归一化变形均呈典型三阶段发展，但演化趋势存在差别。通过围岩受力和变形曲线的时间协同归一化分析，揭示了围岩压力和变形的动态演化与阶段性特征，可为软弱围岩隧道支护结构的设计提供参考。
The determination of rock pressure is a prerequisite for design of tunnel support structure, while rock displacement is a direct characterization of effectiveness of support structure. Based on the statistical monitoring data of 248 cross-sections in 59 mountain tunnels, a comprehensive analysis of the rock pressure and deformation evolution characteristics, as well as their dynamic relationships of soft rock tunnels was conducted. The results showed that horizontal rock pressure is mainly concentrated in low to middle value interval; vertical rock pressure is mostly concentrated in low value interval with an obvious distribution dispersion; there is no significant difference in distribution of rock pressure in both directions for the middle and low value interval of stability time. The horizontal and vertical rock deformation are concentrated in the low to medium value intervals; about 80% of the rock pressure and deformation data are less than 400 kPa and 400 mm. The time-dependent characteristics of normalized rock pressure and deformation demonstrated that the rock pressure and deformation in deep and shallow tunnels are characterized by four stages of the “initial change - rapid change - slow change - stable change. The vertical rock pressure growth rate is greater than the horizontal pressure, and primary support of the vault is faster while the side wall is slower. Normalized deep and shallow vertical rock pressure developed in typical three stages with the normalized deformation, but there are differences in evolutionary trends. The time-coordinated normalization analysis of the rock pressure and deformation reveals the dynamic evolution and stage characteristics of the rock pressure and deformation, which can provide reference for the design of the support structures of soft rock tunnels.
王修领. 软弱隧道围岩压力与变形规律及协调作用关系[J]. 科学技术与工程, , ():复制