Research on PlasticFluidity Indices and Conditioning
Method for&nbsp;Shield
Muck in WaterRich Gravel Stratum in Kunming, China

NING Rui, LIU Fei, CHEN Xianzhi, LI Zhiming, WEI Lian, HUANG Shuo

doi:10.3973/j.issn.2096-4498.2021.S1.005

2021 , Vol. 41 >Issue S1: 36

DOI: https://doi.org/10.3973/j.issn.2096-4498.2021.S1.005

Research on PlasticFluidity Indices and Conditioning Method for Shield Muck in WaterRich Gravel Stratum in Kunming, China

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(1. China Railway Development Investment Group Co., Ltd., Kunming 650217, Yunnan, China;2. Urban Rail Transit Engineering Branch of China Railway Fifth Bureau Group Co., Ltd., Changsha 410205,Hunan, China; 3. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China)

Online published: 2021-08-27

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Abstract

To avoid the risk of unstable tunneling parameters, poor muck state, and spewing of screw conveyor during shield tunneling in waterrich gravel stratum in Kunming, China, a series of tests and analysis are conducted on plasticfluidity of muck and shield tunnel parameters of Kumming metro line 4, and reasonable ranges for shield thrust, cutterhead torque, tunneling speed, and soil chamber pressure and solution for plasticfluidity index slump of muck are proposed. Further, the soil conditioning scheme of waterrick gravel stratum is improved using planning and solution method, and the rational water content and foam injection ratio for muck with different gradations are determined. The field application results indicate the good feasibility of improved soil conditioning scheme, providing guarantee for safe and efficient shield tunneling and followup shield crossing underneath Kunming metro line 2 with a short distance.

Key words： earth pressure balance shield; waterrich gravel stratum; tunneling parameters; soil conditioning

Cite this article

NING Rui, LIU Fei, CHEN Xianzhi, LI Zhiming, WEI Lian, HUANG Shuo .

Research on PlasticFluidity Indices and Conditioning Method for Shield Muck in WaterRich Gravel Stratum in Kunming, China

[J]. Tunnel Construction, 2021 , 41(S1) : 36 . DOI: 10.3973/j.issn.2096-4498.2021.S1.005

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