强风化混合花岗岩地层中盾构泥饼堵塞情况下渣土改良剂效果分析

周凯歌; 方勇; 廖杭; 王凯; 宋天田

doi:10.3973/j.issn.2096-4498.2022.02.014

隧道建设 >

2022 , Vol. 42 >Issue 2: 283 - 290

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.02.014

研究与探索

强风化混合花岗岩地层中盾构泥饼堵塞情况下渣土改良剂效果分析

周凯歌 ,
方勇 ,
廖杭 ,
王凯 ,
宋天田

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(1. 西南交通大学交通隧道工程教育部重点实验室，四川成都 610031； 2. 深圳市地铁集团有限公司，广东深圳 518000)

周凯歌(1996—)，男，河北唐山人，〖ＪＰ＋１〗西南交通大学桥梁与隧道工程专业在读硕士，研究方向为盾构隧道渣土改良。E-mail： 457153183@qq.com。*通信作者：方勇， E-mail: fy980220@swjtu.cn。

网络出版日期: 2022-03-03

基金资助

国家自然科学基金（52078428）；四川省杰出青年基金项目（2020JDJQ0032）

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Effect of Soil Conditioner under Conditions of Shield Mud Cake Blockage in Strongly Weathered Mixed Granite Strata

ZHOU Kaige ,
FANG Yong ,
LIAO Hang ,
WANG Kai ,
SONG Tiantian

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(1. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. Shenzhen Metro Group Co., Ltd., Shenzhen 518000, Guangdong, China)

Online published: 2022-03-03

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摘要

在强风化混合花岗岩地层中掘进时，盾构会遇到刀盘结泥饼、喷涌、掌子面失稳等问题。为解决该问题,需要对地层进行渣土改良。依托深圳地铁13号线留仙洞站—白芒站盾构区间项目，针对强风化混合花岗岩地层，通过自主研发的土壤-界面黏附力测试仪，研究含水率优化、注入分散剂、注入泡沫剂3种改良方法对强风化混合花岗岩地层的改良效果。研究结果表明： 1）含水率优化能有效降低渣土的法向、切向黏附力，而分散剂和泡沫剂只对渣土的切向黏附力有改良作用，对渣土的法向黏附力反而有增大作用，且分散剂的增大幅度较泡沫剂大。2）泡沫剂渣土改良方案对盾构的掘进速度、推力、转矩以及掘进比能都有较好的改善作用。3）泡沫剂渣土改良方案并不能完全防止刀盘结泥饼，建议在采取泡沫剂改良方案的同时适当进行含水率优化，以最大限度降低刀盘结泥饼的风险。

关键词： 盾构隧道; 花岗岩地层; 渣土改良; 界面黏附力; 含水率优化; 泡沫剂; 分散剂

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周凯歌 , 方勇 , 廖杭 , 王凯 , 宋天田 .

强风化混合花岗岩地层中盾构泥饼堵塞情况下渣土改良剂效果分析

[J]. 隧道建设, 2022 , 42(2) : 283 -290 . DOI: 10.3973/j.issn.2096-4498.2022.02.014

Abstract

Shield tunneling in strongly-e soil should be improved. The three soil conditioning methods, i.e., moisture content optimization, dispersing agent injection, and foaming agent injection, are adopted to improve the strongly-weathered granite in the Liuxiandong station-Baimang station of the Shenzhen metro line 13 using a self-developed soil-genus interface adhesion tester. The conclusions drawn are as follows: (1) The optimization of moisture content can effectively reduce the normal and the tangential adhesions of the soil; whereas, the dispersant and foaming agents can only improve the tangential adhesion while increasing normal adhesion and the dispersing agent can increase the normal adhesion with a larger amplitude. (2) The foaming agent has a better improvement effect on the tunneling speed, thrust, torque, and tunneling specific energy of the shield. When compared with the first chamber opening, the second chamber opening shows an improvement of up to 23% in all tunneling parameters. (3) The foaming agent cannot completely prevent the phenomenon of mud cake on the cutterhead. It is recommended to optimize the soil moisture content while adopting the foaming agent to minimize the risk of mud cake formation on the cutterhead.

Key words： shield tunnel; granite stratum; soil conditioning; interfacial adhesion; moisture content optimization; foaming agent; dispersing agent

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