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隧道建设(中英文) ›› 2015, Vol. 35 ›› Issue (11): 1176-1181.DOI: 10.3973/j.issn.1672-741X.2015.11.010

• 研究与探索 • 上一篇    下一篇

南京纬三路过江通道弃砂在壁后注浆材料中的利用

陈喜坤1, 朱伟1,2, 王睿1, 闵凡路1,2, 魏代伟3   

  1. (1. 河海大学土木与交通学院, 江苏南京 210098; 2. 河海大学岩土力学与堤坝工程教育部重点实验室, 江苏南京 210098; 3. 南京河海科技有限公司, 江苏南京 210098)
  • 收稿日期:2015-06-12 修回日期:2015-07-27 出版日期:2015-11-20 发布日期:2015-11-25
  • 作者简介:陈喜坤(1989—),男,河南商丘人,河海大学岩土工程专业在读硕士,研究方向为岩土工程和盾构施工。
  • 基金资助:

    国家重点基础研究发展计划(973 计划)(2015CB057803); 国家自然科学基金项目(51408191); 江苏省疏浚与泥处理利用国家工程技术研究中心培育点(BM2013013)

Application of Waste Sand in Backfilling Grouting in Shielding Tunneling: Case Study on Weisanlu Rivercrossing Tunnel in Nanjing

CHEN Xikun1, ZHU Wei1, 2, WANG Rui1, MIN Fanlu1, 2, WEI Daiwei3   

  1. (1. Key Laboratory of Geomechanics and Embankment Engineering, Hohai University, Ministry of Education, Nanjing 210098, Jiangsu, China; 2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, Jiangsu, China; 3. Nanjing Hohai Technology Co., Ltd., Nanjing 210098, Jiangsu, China)
  • Received:2015-06-12 Revised:2015-07-27 Online:2015-11-20 Published:2015-11-25

摘要:

为了解决南京纬三路过江通道施工产生的弃砂在壁后注浆浆液中的再利用问题,通过将施工产生的弃砂筛分成细度模数分别为1.652、1.096、0.773的砂,并将其分别用于配置不同水胶比的壁后注浆浆液,探究了砂的细度模数对壁后注浆浆液基本性能的影响,进而提出了弃砂再利用的方法。结果表明: 浆液用砂的细度模数越高,浆液的流动度、稠度、泌水率、体积收缩率和凝结时间越长,强度越低;弃砂细度模数筛分为0.75~1.08,水胶比为0.9,可直接作为壁后注浆材料。南京纬三路过江通道弃砂再利用的方案为: 将弃砂过1.25 mm筛后75%替换原浆液用砂,调整水胶比为0.85; 或50%替换原浆液用砂,调整水胶比为0.9,2种方案都满足了工程要求,并具有一定的经济效益。

关键词: 南京纬三路过江通道, 弃砂, 泥水盾构, 壁后注浆, 细度模数

Abstract:

A large amount of waste sand is produced in shield tunneling and it is of great importance to study the recycling use of the waste sand in backfilling grouting. In the paper, the waste sand produced in the construction of Weisanlu Rivercrossing Tunnel in Nanjing is classified into three grades with 1.652, 1.096 and 0.773 fineness modulus respectively, backfilling grouts with different water/binder ratios are prepared by using the mentioned waste sand, the influence of the fineness modulus of the sand on the basic properties of the backfilling grout is studied, and suggestion is made on the application of the waste sand in the backfilling grout. Conclusions drawn are as follows: 1) The higher the fineness modulus of the sand, the larger the fluidity, consistency, bleeding rate, volume shrinkage rate and setting time of the grout, and the lower the strength of the grout; 2) Grout prepared with the waste sand of 0.75~1.08 fineness modulus and having 0.9 water/binder ratio can be directly used for backfilling; 3) The following two waste sand recycling use schemes can be adopted for Weisanlu Rivercrossing Tunnel in Nanjing: A) The sand in the original mixing proportion is replaced by the waste sand screened by 1.25 mm sieve, with 75% replacement ratio, and the water/binder ratio is adjusted as 0.85; B) The sand in the original mixing proportion is replaced by the waste sand screened by 1.25 mm sieve, with 50% replacement ratio, and the water/binder ratio is adjusted as 0.9. 

Key words: waste sand, slurry shield, backfilling grouting, fineness modulus, Weisanlu Rivercrossing Tunnel in Nanjing

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