摘要
在顶管隧道施工中,同步注浆是控制地表变形和顶力控制的关键环节。目前对于传统的同步注浆研究主要局限于浆液材料,摩擦系数的研究,而对浆液本身流动及其填充机理的研究涉及很少。通过建立顶管-浆液-土体系统和模型试验装置,在考虑相似律的情况下,介绍了大断面矩形顶管同步注浆的室内缩尺模型试验研究结果,研究了传统触变浆液(由膨润土、羧甲基纤维素和纯碱组成)和HS-3复合浆液和聚丙烯酰胺复合浆液对泥浆套质量影响效果。试验中测量了土层的竖向位移变化、顶进力的大小,以观察同步注浆对地面位移和顶力的影响。探究了浅覆土大断面矩形顶管隧道同步注浆对地面位移和顶进力的大小影响规律。试验发现,在注浆情况下,顶进力可以减少40%左右。
During the construction of pipe jacking tunnels,the simultaneous injection is a key in controlling the surface deformation and jacking force.At present,the traditional researches on the simultaneous injection are mainly limited to those on the slurry materials and the friction coefficient,while the researches on the flow of the slurry itself and its filling mechanism are rarely involved.By establishing the pipe-slurry-soil system and the model test platform,the results of a laboratory reduced-scale model test on the simultaneous injection of slurry of super-large rectangular pipe jacking are introduced.It is shown that different slurries have different effects on the quality of the protective slurry screen,which contains the traditional thixotropic slurry(consisting of bentonite,CMC(carboxy methyl cellulose)and soda ash)and HS-3 compound slurry and polyacrylamide compound slurry.The settlements of different parts of soils and the pipe jacking forces are measured to observe the influences of the protective slurry screen on the ground settlements and the pipe jacking forces.The effects of the simultaneous injection on the ground displacements and the jacking forces of a large-section rectangular pipe-jacking tunnel with shallow overburden are explored.The test results show that the jacking forces can be reduced by about 40%under the simultaneous injection.
作者
潘羽擎
甄亮
蒋海里
李晓军
PAN Yu-qing;ZHEN Liang;JIANG Hai-li;LI Xiao-jun(College of Civil Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;Technical Center,Shanghai Road and Bridge(Group)Co.,Ltd.,Shanghai 200433,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2022年第S02期125-129,共5页
Chinese Journal of Geotechnical Engineering
基金
上海市青年科技启明星计划资助项目(19QB1401800)
