Journal of Shanghai Jiaotong University ›› 2018, Vol. 52 ›› Issue (11): 1492-1500.doi: 10.16183/j.cnki.jsjtu.2018.11.011

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Experiments of Soil Conditioning for Shield Tunneling in Watery Quartz Sand-Gravel Ground

CHENG Chihao,LIAO Shaoming,CHEN Lisheng,FAN Mingxing,HUO Xiaobo   

  1. 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Shanghai Urban Construction Municipal Engineering (Group) Co., Ltd., Shanghai 200065, China; 3. Shanxi Electric Power Exploration Design Institute, Taiyuan 030001, China

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

CLC Number: