基于等效周长法研究隧道衬砌水压力荷载及内力  

Study on water pressure load and internal force of tunnel lining based on the method of equivalent perimeter alternative

作　　者：王志杰[1] 何晟亚[1] 袁晔[1] 王宁[1] 何明磊[1] 

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031

出　　处：《铁道科学与工程学报》2015年第3期577-583,共7页Journal of Railway Science and Engineering

基　　金：中央高校基本科研业务费专题项目(SWJTU11ZT33);铁道部科技研究开发计划重大课题(2009.GD20-B)

摘　　要：为研究方形隧道断面衬砌水压力及内力,利用等效周长替代法,将方形隧道断面转变成圆形隧道断面,并运用轴对称解析法与有限差分FLAC3D分别计算在不同衬砌渗透系数、不同注浆半径和不同衬砌厚度情况下,隧道衬砌水压力、渗透量、内力、偏心距以及安全系数。结果表明:轴对称解析法的渗透量和水压力与有限差分数值计算法的很接近;在不透水情况下,水压力不进行折减;通过控制排水、减小衬砌渗透系数、适当增大围岩注浆或适当增大衬砌厚度可以调节衬砌水压力、偏心距与安全系数;衬砌厚度对边角处安全系数影响大;以设计水荷载为正算,施工监测水压力为反算,在施工过程中,检验并修正水荷载。In order to study the rectangular tunnel cross -section lining water pressure and internal force,using the method of equivalent perimeter alternative that converts a square tunnel section into a circular tunnel section, and using the axisymmetric analytic method and the finite difference FLAC3D which are adopted respectively in calculating the tunnel lining hole pressure,flow,internal force,eccentricity and safety coefficient under the con-dition of different permeability coefficient,grouting radius and lining radius .The result of flow and pore pressure by axisymmetric analytic method and finite difference numerical calculation method is very close;Under the wa-ter -proof situation there is no reduction of the pore pressure;The water pressure upon lining ,eccentricity,fac-tor of safety can be adjusted by controlling the drainage increasing the grout of surrounding rock and the lining of the radius or decreasing the coefficient of permeability of lining.The lining of the radius has a most effect on fac-tor of safety in the corner.The normal computation was used to design the water load while the construction mo-nitoring water pressure was back calculated,and the water load should be inspected and corrected in the process of construction.

关 键 词：隧道 水荷载 渗透系数 围岩注浆 衬砌厚度 

分 类 号：U45[建筑科学—桥梁与隧道工程]