莲盐NATM高速公路隧道围岩变形时空效应的统计分析

为对隧道不同级别围岩的稳定性进行评价及对二次衬砌的合理施作时机提供依据,基于深圳莲盐6座3车道NATM高速公路隧道的现场监测数据,采用概率论数理统计方法,绘出Ⅱ~Ⅴ级围岩收敛变形与拱顶下沉变形稳定时间、稳定距离的散点图和直方图,并拟合出其正态分布函数。经统计分析得出：隧道围岩从开挖到变形稳定时间、稳定距离与围岩级别有关,随着围岩级别的增大,其变形稳定距离与稳定时间大体呈相应增大的规律。

Statistic Analysis on Time-Space Effects of Deformation of Surrounding Rocks: Case Study on NATM Tunnels on Lianhua-Yanba Highway

The scatter diagram and histogram of the stabilization time and stabilization distance of the deformation under Grade Ⅱ to Grade Ⅴ surrounding rocks,as well as the crown settlement,are drawn and their fitted normal distribution function is provided,based on the site monitoring data of 6 three-lane NATM tunnels on Lianhua-Yanba Highway in Shenzhen,so as to estimate the stability of different grades of surround rocks and to provide reference for the timing of the secondary lining installation.Conclusions drawn are as follow： The stabilization time and stabilization distance of the deformation of the surrounding rocks of tunnels have some connection with the grades of the surrounding rocks and the stabilization time and stabilization distance grow as the grades of the surrounding rocks grow.