Research on the optimization of proportions for synchronous grouting material in composite muck during shield tunneling

IF 9.7 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Jian Zhang, Cheng Zhu, Mengxiang Kuang, Tao Xu, Xiaohu Wang, Tugen Feng, Jingmin Xu
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Abstract

To tackle the challenge of onsite resource reuse of composite muck, which relies on a shield tunneling section in the case of Nanjing Metro Line 7, this paper examines the effects of component substitution and varying proportions of factors on slurry properties through laboratory tests and multiobjective modeling. From a practical application perspective, the potential of using composite muck as a synchronous grouting material for shield tunneling was explored. In reference to the common mixed strata encountered in shield tunneling construction in the Nanjing area, a general slurry mixing ratio suitable for various mixed strata conditions was derived. The research results indicate the following optimized mixing ratios for the composite muck slurry: a water-to-binder (cement + fly ash) ratio of 0.76, a cement-to-fly ash ratio of 0.53, a binder-to-soil (silty clay + silty fine sand + river sand) ratio of 0.67, a clay (i.e., silty clay)-to-sand (i.e., silty fine sand + river sand) ratio of 0.4, and a substitution ratio (i.e., silty fine sand/silty fine sand + river sand) of 0.2. This slurry is feasible for practical applications and can reduce construction costs by 38.13%. The obtained general mixing ratio for the composite muck slurry, suitable for various mixed stratigraphic conditions, essentially meets onsite construction requirements (the bleeding rate is controlled within a low range of 1.1 to 3.1%, and the maximum compressive strength reaches up to 6.76 MPa at 28 days), with reasonable costs. It streamlines construction by eliminating the need for onsite screening of muck, allowing for the direct onsite reuse of composite muck in shield tunneling.
盾构掘进过程中复合泥浆中同步注浆材料的配比优化研究
针对南京地铁七号线盾构掘进区间复合淤泥的现场资源再利用难题,本文通过实验室试验和多目标建模,研究了成分替代和不同比例因素对泥浆性能的影响。从实际应用角度出发,探讨了将复合泥浆作为盾构隧道同步注浆材料的潜力。参考南京地区盾构隧道施工中常见的混合地层,得出了适合各种混合地层条件的通用泥浆混合比。研究结果表明,复合泥浆的优化配比如下:水与粘结剂(水泥+粉煤灰)的比例为 0.76,水泥与粉煤灰的比例为 0.53,粘结剂与土壤(淤泥质粘土+淤泥质细砂+河砂)的比例为 0.67,粘土(即淤泥质粘土)与砂的比例为 0.67、粘土(即淤泥质粘土)与砂(即淤泥质细砂 + 河砂)的比率为 0.4,替代比率(即淤泥质细砂/淤泥质细砂 + 河砂)为 0.2。这种泥浆在实际应用中是可行的,可降低 38.13% 的建筑成本。所获得的复合淤泥浆的一般混合比适用于各种混合地层条件,基本满足现场施工要求(出血率控制在 1.1 至 3.1% 的较低范围内,28 天时的最大抗压强度可达 6.76 兆帕),且成本合理。它无需在现场筛选淤泥,从而简化了施工流程,使复合淤泥可直接在现场重新用于盾构隧道掘进。
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来源期刊
Journal of Cleaner Production
Journal of Cleaner Production 环境科学-工程:环境
CiteScore
20.40
自引率
9.00%
发文量
4720
审稿时长
111 days
期刊介绍: The Journal of Cleaner Production is an international, transdisciplinary journal that addresses and discusses theoretical and practical Cleaner Production, Environmental, and Sustainability issues. It aims to help societies become more sustainable by focusing on the concept of 'Cleaner Production', which aims at preventing waste production and increasing efficiencies in energy, water, resources, and human capital use. The journal serves as a platform for corporations, governments, education institutions, regions, and societies to engage in discussions and research related to Cleaner Production, environmental, and sustainability practices.
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