砂卵石地层中泥膜支护土压盾构施工试验  

Test of Construction Method of EPB Shield with Filter Membrane Supporting in Sand and Cobble Stratum

作　　者：钱勇进 朱伟[3] 闵凡路[1,2] 杜瑞 王超[1,2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学土木与交通学院,江苏南京210098 [3]河海大学环境学院,江苏南京210098

出　　处：《中国公路学报》2017年第8期210-215,共6页China Journal of Highway and Transport

基　　金：国家重点基础研究发展计划("九七三"计划)项目(2015CB057803);国家科技重大专项资助项目(2013ZX07113001);中央高校基本科研业务费专项资金项目(2016B42814)

摘　　要：为了给盾构机在砂卵石地层中安全顺利的掘进提供参考,针对砂卵石地层中土压盾构掘进时开挖面稳定性难以控制、泥水盾构渣土排出困难的情况,提出一种使用泥膜支护开挖面,并使用螺旋排土器进行排土的新型盾构施工方法。考虑泥浆掺加量对泥浆砂卵石混合土在地层中的渗透及支护应力传递模式的影响,进行了不同泥浆掺加量下泥浆砂卵石土的渗透试验研究。在自制的渗透试验装置中,对6组不同泥浆掺加量的泥浆砂卵石混合土进行渗透试验,通过测定压力作用下地层及混合土中超静孔隙水压力及滤水量变化,分析泥浆砂卵石混合土的支护应力传递模式,讨论泥膜支护土压盾构的泥浆掺加量范围。结果表明:随着泥浆掺加量的增加,地层中的超静孔隙水压力消散速率在增加;存在3种应力传递模式,分别是孔隙水压力型传递、泥皮加渗透带型泥膜传递以及泥皮型泥膜传递;泥浆掺加量为23%~25%时可以实现泥膜支护。In allusion to the phenomena that the excavation face was hard to control during the process of the shield excavation of the earth pressure balance（EPB）shield in the sand cobble stratum and muck of slurry shield was difficult to transport,a new type of shield tunneling method was proposed to provide a reference for the safe and smooth excavation of the shield machine in the sand cobble stratum.The filter cake was used to support the excavation surface,while the muck was transported by the screw conveyor.Considering the influence of the mixing amount of slurry on penetration of slurry cobble mixed soil in the stratum as well as the mode of supporting stress transmission,a series of penetration tests of slurry cobble mixed soil with six mixing amounts were carried out by dint of the testing apparatus of penetration.By measuring the change of the excess pore water pressure and water filtration in the stratum and mixed soilunder pressure effect,the mode of supporting the stress transmission of slurry cobble mixed soil was analyzed and the range of mixing amount of slurry in EPB shield tunneling with filter membrane supporting in sand and cobble stratum was discussed.The results indicate that with the increasing amounts of slurry,the dissipation rate of excess pore water pressure in the stratum increases.There are three kinds of stress transmission modes,namely,pore water pressure transmission,transmission of filter membrane with an infiltrated zone and filter membrane transmission.With the mixing amount of slurry from 23% to 25%,the method of filter membrane supporting can be achieved.

关 键 词：盾构隧道 复合盾构 渗透试验 泥浆掺加量 超静孔隙水压力 砂卵石地层 支护应力 

分 类 号：U455[建筑科学—桥梁与隧道工程]