基于盾构掘进效果的富水砾砂地层渣土改良试验研究

刘飞; 杨小龙; 冉江陵; 吴田涛; 杨鹏; 王树英

doi:10.3973/j.issn.2096-4498.2020.10.005

隧道建设 >

2020 , Vol. 40 >Issue 10: 1426 - 1432

DOI: https://doi.org/10.3973/j.issn.2096-4498.2020.10.005

研究与探索

基于盾构掘进效果的富水砾砂地层渣土改良试验研究

刘飞 ,
杨小龙 ,
冉江陵 ,
吴田涛 ,
杨鹏 ,
王树英

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（1. 中铁五局集团有限公司城市轨道交通工程分公司，湖南长沙 410205；2. 中铁开发投资集团有限公司，云南昆明 650100；3. 中南大学土木工程学院，湖南长沙 410075）

刘飞（1982—），男，四川德阳人，2007年毕业于西南科技大学，土木工程专业，本科，高级工程师，现从事隧道施工与管理方面的工作。 E-mail： 78835264@qq.com。

网络出版日期: 2020-11-01

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Research on Soil Conditioning of WaterRich Sandy Gravel Strata Based on Shield Tunneling Effect

LIU Fei ,
YANG Xiaolong ,
RAN Jiangling ,
WU Tiantao ,
YANG Peng ,
WANG Shuying

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(1. Urban Rail Transit Engineering Branch of China Railway No.5 Engineering Group Co., Ltd., Changsha 410205, Hunan, China; 2. China Railway Development Investment Group Co., Ltd., Kunming 650100, Yunnan, China; 3. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China)

Online published: 2020-11-01

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摘要

为解决土压平衡盾构在富水砾砂地层中掘进时螺旋输送机出口易发生喷涌的难题，依托昆明地铁4号线盾构隧道工程，开展富水砾砂地层渣土改良研究。首先通过大型渗透试验评价地层的渗透性，然后对试验段内每环的渣土进行坍落度试验，分析渣土改良对盾构掘进参数的影响，检验并评价渣土改良的实际效果，进而给出昆明地区富水砾砂地层的合理改良建议。研究结果表明： 1）昆明地区砾砂土的坍落度与含水率呈明显的正相关关系，而其渗透系数随测试时间的增加而降低，在2 h后减小为0； 2）塑流性较好的渣土对应着较低的刀盘转矩、推力和较高的掘进速度； 3）通过对掘进参数的分析可知，坍落度达到5~10 cm即可满足施工要求。

关键词： 地铁隧道; 富水砾砂地层; 土压平衡盾构; 渣土改良; 现场测试

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刘飞 , 杨小龙 , 冉江陵 , 吴田涛 , 杨鹏 , 王树英 . 基于盾构掘进效果的富水砾砂地层渣土改良试验研究[J]. 隧道建设, 2020 , 40(10) : 1426 -1432 . DOI: 10.3973/j.issn.2096-4498.2020.10.005

Abstract

In earth pressure balance (EPB) shield tunnels in waterrich sandy gravel strata, water is easily spewed from screw conveyors. Hence, a soil conditioning test is conducted on waterrich sandy gravel strata based on the shield tunnel project of Kunming Metro Line 4. First, the soil permeability is evaluated by conducting a laboratory test. Second, a slump test is conducted on the site, and the effect of slump values on the tunneling parameters is analyzed. Finally, the surface subsidence is monitored to evaluate the effect of soil conditioning. Accordingly, guidance on soil conditioning of waterrich sandy gravel strata in Kunming is presented. The following results are obtained. (1) There is a positive relationship between the slump value of sandy gravel strata in Kunming and its water content, and the permeability parameter decreases with time, attaining a value of zero after 2 h. (2) The cutterhead torque and thrust are small, and the tunneling speed is high in soils with a good plastic flow. (3) According to the analysis of the tunneling parameters, the slump of soil between 5 and 10 cm can satisfy the construction requirements for waterrich sandy gravel strata.

Key words： metro tunnel; waterrich sandy gravel strata; earth pressure balance (EPB) shield; soil conditioning; field test

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