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Development and experimental study on environmental slurry for slurry shield tunneling

机译：泥水盾构隧道环境泥浆的研制与试验研究

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摘要

Slurry shield is widely used in undersea and cross-river tunnels. The wide use of slurry shield leads to a lot of wasted excavated slurries. At present, most of the slurries are consisted of clay, bentonite, water and carboxymethyl cellulose (CMC), which makes slurries difficult to degrade and pollutes the environment. Biodegradable pregelatinized starch (PGS), harmless to the environment, was found to utilize its network structure in solutions to effectively decrease API filtration and increase Russian funnel viscosity of slurries. The effects of different PGS content on the variations in the properties of slurry were studied by experiments on mixing proportions in slurries. The filtration test of PGS slurries with a specific mixing proportion in medium-coarse sand strata was performed. By measuring the filter loss and the variation in excess static pore water pressure during the test process, whether the slurry effectively filled the strata pores and provided support pressure could be evaluated. The experimental results showed that adding 0.3% PGS by total weight to a slurry with a 0.0833 mass mixing proportion of bentonite to tap water performed good fluidity and control of water loss, and formed filter cake with a thickness of 3 mm. Based on the results from airtightness tests, the airtight pressure of the above filter cake is 0.12 MPa, and, correspondingly, the airtight time is approximately 6000 s. Thus, it is conceivable to use PGS for slurry preparation during normal tunneling. (C) 2019 Elsevier Ltd. All rights reserved.
机译：泥浆护盾广泛用于海底和跨河隧道。泥浆防护罩的广泛使用导致大量浪费的挖掘泥浆。目前，大多数浆料由粘土，膨润土，水和羧甲基纤维素（CMC）组成，这使得浆料难以降解并污染环境。发现对环境无害的可生物降解的预糊化淀粉（PGS）利用其网络结构解决方案可有效减少API过滤并提高浆液的俄罗斯漏斗粘度。通过对浆料中混合比例的实验研究了不同PGS含量对浆料性能变化的影响。在中等粗砂层中，对具有特定混合比例的PGS泥浆进行了过滤测试。通过在测试过程中测量过滤器损耗和静态静水压力的变化，可以评估浆液是否有效填充了地层孔隙并提供了支撑压力。实验结果表明，将总重量为0.3％的PGS加入膨润土与自来水中的质量比为0.0833的浆料中，具有良好的流动性和失水控制，形成了3mm的滤饼。基于气密性测试的结果，上述滤饼的气密压力为0.12MPa，并且相应地，气密时间为大约6000s。因此，可以想到的是，在常规隧道掘进过程中将PGS用于泥浆制备。 （C）2019 Elsevier Ltd.保留所有权利。

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  • 来源
    《Construction and Building Materials》 |2019年第20期|416-423|共8页
  • 作者

    Cui Wei; Liu Dong; Song Hui-fang; Pu Guo-jiang;

  • 作者单位

    Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300354, Peoples R China|Tianjin Univ, Sch Civil Engn, Tianjin 300354, Peoples R China;

    Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300354, Peoples R China|Tianjin Univ, Sch Civil Engn, Tianjin 300354, Peoples R China;

    Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300354, Peoples R China|Tianjin Univ, Sch Civil Engn, Tianjin 300354, Peoples R China;

    Sinohydro Bur 14 Co Ltd, Kunming 650041, Yunnan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Slurry shield; PGS; Environmental slurry; Penetration test; Mixing proportion of slurry; Airtightness test;

    机译：泥浆防护罩;PGS;环境泥浆;渗透试验;泥浆混合比;气密性试验;

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