富水石英砂砾层盾构施工的土体改良试验

doi:10.16183/j.cnki.jsjtu.2018.11.011

摘要/Abstract

摘要： 针对某石英含量较高的富水砂砾地层地铁工程进行了系统的土体改良试验，并以室内试验的添加剂配比方案为基础进行了现场掘进应用及施工试验.结果表明：通过土体改良试验得到了最优的室内试验添加剂配比，即在天然含水率条件下泡沫注入比为10%，泥浆注入比为23%～25%；现场施工应密切关注土仓与螺旋输送机的压力平衡关系，并调整添加剂注入量，以达到防止盾构喷涌和控制刀盘载荷的目的，并使得渣土的坍落度和稠度分别保持在20cm和8cm左右.

关键词: 土压盾构, 富水石英砂砾层, 土体改良, 适应性

Abstract: Through a shield project in watery quartz sand-gravel ground, a series of soil conditioning tests are conducted. Then optimal parameters are obtained under natural water content, namely injection ratio of foam 10% and slurry 23%～25%. Based on formulas of laboratory tests and construction feedback, pressure balancing of soil chamber and screw conveyer should be closely focused. Cutter torque should be controlled in the normal range, while at the same time slumps and consistency of mucks should be about 20cm and 8cm, respectively. The relevant results can be used to provide references for soil conditioning by use of EPB machine in similar ground conditions.

Key words: earth pressure balance shield, flowing quartz gravel, soil conditioning, ground suitability

中图分类号:

TU 455.43

程池浩1,廖少明1,陈立生2,范明星2,霍晓波3. 富水石英砂砾层盾构施工的土体改良试验[J]. 上海交通大学学报（自然版）, 2018, 52(11): 1492-1500.

CHENG Chihao,LIAO Shaoming,CHEN Lisheng,FAN Mingxing,HUO Xiaobo. Experiments of Soil Conditioning for Shield Tunneling in Watery Quartz Sand-Gravel Ground[J]. Journal of Shanghai Jiaotong University, 2018, 52(11): 1492-1500.

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