富水砾砂-泥质粉砂岩复合地层渣土改良试验研究  

Experimental study on soil conditioning with water bearing gravelly sand-argillaceous siltstone composite stratum

作　　者：朱碧堂 余金 王凌 张跃明 蒋亚龙 杜林泉 黄展军 ZHU Bitang;YU Jin;WANG Ling;ZHANG Yueming;JIANG Yalong;DU Linquan;HUANG Zhanjun(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,P.R.China;Engineering R&D Centre for Underground Technology of Jiangxi Province,East China Jiaotong University,Nanchang 330013,P.R.China;Guangzhou Metro Design&Research Institute Co.,Ltd.,Guangzhou 510010,P.R.China;Nanchang Rail Transit Group Co.,Ltd.,Nanchang 330013,P.R.China)

机构地区：[1]华东交通大学土木建筑学院,南昌330013 [2]华东交通大学江西省地下空间技术开发工程研究中心,南昌330013 [3]广州地铁设计研究院股份有限公司,广州510010 [4]南昌轨道交通集团有限公司,南昌330013

出　　处：《土木与环境工程学报（中英文）》2022年第5期29-37,共9页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(41972291、52020105003);江西省交通运输厅重点工程科技项目(2019C0010);江西省交通运输厅科技项目(2021Z0004)。

摘　　要：盾构穿越复合地层时,富水砾砂层含量高易发生“喷涌”、掌子面失稳,泥岩地层含量高则易发生结泥饼、刀具抱死及偏磨、出渣困难等问题。针对这些施工难题,以南昌地铁4号线七里站—民园路西站(七民)盾构区间穿越富水砾砂-泥质粉砂岩复合地层为研究对象,基于5种不同复合程度掌子面地层渣土改良试验,研究土压平衡盾构在动态变化的复合地层中所需的合理渣土改良剂配比。结果表明:对于复合地层,随着泥岩占比从10%增加至90%,泡沫注入率从20%逐渐增大至50%,膨润土泥浆注入率从20%逐渐减小至0。现场应用结果表明,采用该改良方案可保证土仓内渣土流塑性较好、渗透性较低。When the shield passes through the composite stratum,the content of water rich gravelly sand layer is high,which is prone to"gushing",tunnel face instability,and the content of argillaceous siltstone stratum is high,which is more prone to mud cake,tool locking,eccentric wear and slag discharge.In view of these construction problems above,the shield section of Qili station-Minyuan Road West Station of Nanchang Metro Line 4 as an example,which passes through the water rich gravel sand-argillaceous siltstone composite stratum,this paper conducts the soil conditioning tests for five tunnel faces with different composite degrees and examines the reasonable proportion of soil conditioning mixture ratio in these varying composite of earth pressure balance shield.The results show that:with the ratio increase of argillaceous siltstone from 10%to 90%,the foam injection ratio increases from 20%to 50%,and the injection ratio of bentonite slurry decreases from 20%to 0.The field application results show that the soil conditioning scheme above can ensure the good fluidity and low permeability of the muck,and solve the problems of gushing and mud cake during shield tunneling in different degrees of composite stratum.

关 键 词：土压平衡盾构 富水砾砂 复合地层 渣土改良 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]