辽宁工程技术大学学报（自然科学版）2024，Vol.43Issue(2)：171-178,8.DOI:10.11956/j.issn.1008-0562.2024.02.007
跨海区域砾砂地层泥水盾构泥浆成膜效果试验研究
Experimental study on the film-forming effect of shield mud in gravel formation in cross-sea area
摘要
Abstract
In order to reveal the law of slurry film formation at the excavation face of slurry shield tunneling,based on the engineering background of Qingdao Metro Line 8 mud-water shield tunneling and cross-sea section,the dynamic process of slurry infiltration film-forming with different levels is elaborated,and the formation mechanism of three kinds of mud films under the action of high polymer and treatment agent is analyzed.The film-forming device is designed based on the specific gravel sand stratum.The laboratory test is carried out by using the control variable method,and two kinds of fine sand with particle size are selected to adjust the mud gradation.The mud properties of different NSHS-3 content were analyzed.The test results show that the permeability belt formed by fine sand with particle size less than 0.25 mm has better grasping effect and is more suitable for gravel sand formation than that formed by fine sand with particle size less than 0.01 mm.Under the formation condition of the same particle size distribution,the mud viscosity is higher,the stability is higher,the mud film is easy to form,the thickness is thinner,the quality is dense,and the filter water is low.However,excessive additives can cause some soil particles to gather.When not pressurized,it will adhere to the excavation face,and then block the shield pipeline transportation system.The stability of the mud film is poor and resources are wasted.The test results verify that the filtration water is clear and the filtration loss is small in the process of B6 mud pressurization,and the strength of the mud skin and permeable zone type mud film is high,which ensures the stability of the excavation face and less flocculation,and has better economy.The research conclusions provide a reference for the improvement of slurry shield construction in similar strata.关键词
泥水盾构/砾砂地层/泥浆成膜/渗透机理/泥浆黏度Key words
slurry shield/gravel formations/slurry film-forming/osmosis mechanism/mud viscosity分类
建筑与水利引用本文复制引用
李国敏,朱训国,夏洪春,李伟..跨海区域砾砂地层泥水盾构泥浆成膜效果试验研究[J].辽宁工程技术大学学报（自然科学版）,2024,43(2):171-178,8.基金项目
国家自然科学基金项目(52279116) （52279116）
辽宁省复杂结构灾害预测与防治重点实验室平台重点项目(202101ZD02) （202101ZD02）
