Applicability of recycling of shield waste sand as synchronous grouting during shield construction under the Nanjing Yangtze River

LIU Huigang; DING Jianwen; JI Feng; GAO Pengju; LIAO Zhaosheng

doi:10.11835/j.issn.2096-6717.2021.261

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Applicability of recycling of shield waste sand as synchronous grouting during shield construction under the Nanjing Yangtze River

Civil Engineering | 更新时间：2023-11-21

- Applicability of recycling of shield waste sand as synchronous grouting during shield construction under the Nanjing Yangtze River
- Journal of Civil and Environmental Engineering Vol. 45, Issue 6, Pages: 134-142(2023)
- 作者机构：
  
  1.东南大学交通学院，南京 210096
  2.南水北调东线江苏水源有限责任公司，南京 210029
- 作者简介：
  
  LIU Huigang (1996- ), main research interest: geotechnical engineering, E-mail: lhgseu@163.com.
  DING Jianwen （corresponding author）, PhD, professor, doctorial supervisor, E-mail: jwding@seu.edu.cn.
- 基金信息：
  
  National Natural Science Foundation of China(51978159);National Science and Technology Support Program(2015BAB07B06)
- DOI：10.11835/j.issn.2096-6717.2021.261
  CLC： TU744
- Received：29 September 2021，
  
  Published：25 December 2023
- 稿件说明：
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刘慧刚,丁建文,吉锋等.南京江底盾构施工废弃砂土在同步注浆中再利用的适用性[J].土木与环境工程学报,2023,45(06):134-142.

LIU Huigang,DING Jianwen,JI Feng,et al.Applicability of recycling of shield waste sand as synchronous grouting during shield construction under the Nanjing Yangtze River[J].Journal of Civil and Environmental Engineering,2023,45(06):134-142.
刘慧刚,丁建文,吉锋等.南京江底盾构施工废弃砂土在同步注浆中再利用的适用性[J].土木与环境工程学报,2023,45(06):134-142. DOI： 10.11835/j.issn.2096-6717.2021.261.

LIU Huigang,DING Jianwen,JI Feng,et al.Applicability of recycling of shield waste sand as synchronous grouting during shield construction under the Nanjing Yangtze River[J].Journal of Civil and Environmental Engineering,2023,45(06):134-142. DOI： 10.11835/j.issn.2096-6717.2021.261.

摘要

依托南京长江新济洲供水廊道项目泥水盾构工程，针对江底粉细砂地层和岩石地层中泥水盾构施工产生的废弃砂土，研究其在盾构同步注浆材料中再利用的适用性。通过改变砂土地层弃砂的粒径分布，研究其对砂浆性能的影响；针对岩石地层产生的废弃砂土，研究其颗粒形状对砂浆性能的影响，并对岩层弃砂制备同步砂浆进行配比优化。结果表明：该工程砂土层弃砂可直接代替原配比中的砂进行再利用，岩层弃砂通过调整配比亦能满足工程要求；增大砂层弃砂细度模数和砂粒含量可改善砂浆的流动性，但砂土黏粒含量过大会使砂浆流动性变差、凝结时间缩短、强度降低；岩层弃砂颗粒表面越粗糙，所制备砂浆流动性越差，凝结时间越短。合适配比下，盾构施工废弃砂土可应用于同步注浆，砂浆配比应随废弃砂土粒径分布和颗粒形状的变化做出适当调整。

Abstract

Based on the slurry shield engineering of Xinjizhou water supply corridor project in Nanjing Yangtze River

the applicability of reusing waste sand as shield synchronous grouting materials was studied

which was produced by slurry shield construction in silty fine sand layer and rock stratum. Through changing the particle size distribution of abandoned sand in sandy soil layer

its influence on the performance of mortar was examined; furthermore

the influence of the particle shape of rock stratum waste sand on the performance of mortar was investigated

and the proportioning optimizing of synchronous mortar prepared from rock stratum waste sand was discussed. The results indicated that the sand layer waste sand can be used to replace the original sand directly

and the rock stratum waste sand can also satisfy the engineering requirements by adjusting the proportion; the fluidity of mortar improves with the increase of fineness modulus and sand content of sand layer waste sand

but excessive clay content results in decreased fluidity

shorter setting time and lower strength of mortar; the rougher the surface of rock stratum waste sand particles

the worse the fluidity and shorter the setting time. The waste sand of shield construction can be used for synchronous grouting under the appropriate proportioning

but the mortar proportioning should be adjusted appropriately with the change of particle size distribution and particle surface shape of waste sand.

关键词

Keywords

references

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