钻探工程2024，Vol.51Issue(1)：154-160,7.DOI:10.12143/j.ztgc.2024.01.021
临海富水砂层盾尾刷更换聚氨酯环试验研究
Experimental study on polyurethane ring in the replacement of shield tail brush in water-rich sand strata at the coast
罗利平 1赵健 2孙恒 3黄新淼3
作者信息
- 1. 中交二航局成都建设工程有限公司,四川 成都 610218
- 2. 中交(南京)建设有限公司,江苏 南京 211899
- 3. 中交第二航务工程局有限公司,湖北 武汉 430040
- 折叠
摘要
Abstract
In shield tunneling,the method of replacing the shield tail brushes with grouting needs to forma closed and stable water stop ring,including a polyurethane ring and a slurry ring.This paper combines the example of shield tunneling construction in a water-rich sand strata at the coast,collects the in-situ groundwater to conduct indoor test about the polyurethane including the initial setting time,foaming rate,solid strength,etc.The results show that hydrophilic polyurethane reacts rapidly with groundwater,forming a compact and uniform consolidated body with low foaming rate and low strength,while the hydrophobic polyurethane is in the opposite state.Both can be considered to use on site actual injection at the same time,first injecting hydrophilic polyurethane,then injecting hydrophobic polyurethane with the dosage of 5∶1.The on-site application proves that the formed inclusions are stable and of good quality.关键词
盾尾刷更换/富水砂层/聚氨酯环/亲水型聚氨酯/疏水型聚氨酯Key words
replacement of shield tail brush/water-rich sand strata/polyurethane ring/hydrophilic polyurethane/hydrophobic polyurethane分类
交通工程引用本文复制引用
罗利平,赵健,孙恒,黄新淼..临海富水砂层盾尾刷更换聚氨酯环试验研究[J].钻探工程,2024,51(1):154-160,7.
