Recycling of discharged soil from EPB shield tunnels as a sustainable raw material for synchronous grouting

Zhang, Cong; Yang, Junsheng; Fu, Junwei; Wang, Shuying; Yin, Jian; Xie, Yipeng

doi:10.1016/j.jclepro.2020.121947

Cited by 39 publications

(12 citation statements)

References 19 publications

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“…e shield method is commonly applied in current subway construction. As an urban underground transportation project, shield subway tunnels should be durable and safe [1,2]. When the shield machine works, the surrounding soil is disturbed.…”

Section: Introductionmentioning

confidence: 99%

High-Volume Upcycling of Waste Sediment and Enhancement Mechanisms in Blended Grouting Material

Zhang

Jia

Yang

et al. 2022

Advances in Materials Science and Engineering

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Waste sediment (WS) is a solid waste produced from subway construction. In the present work, high-volume WS was upcycled to prepare grouting material.The results showed that the working performances (consistency, fluidity, setting time, bleeding ratio, and stone ratio)of WS-based grouting material were significantly affected by the mass concentration of solid components, binder to WS ratio, and steel slag addition. This material can meet the engineering requirement by adjusting these parameters. The WS-based grouting material exhibited superior performance compared to traditional grouting materials. It achieved self-leveling (160 mm fluidity) and wassuitable for grouting (consistency within 100-130 mm, 95.0% stone ratio). Amorphous phases were formed in the hardened sample. The addition of a suitable amount of steel slag (10%) can reduce the total porosity, and also promote the hydration degree and increase the mechanical properties of cement matrix.The strength development can be attributed to the formation of hydration products and the cementation between hydrates and sediment particles.

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Section: Introductionmentioning

confidence: 99%

High-Volume Upcycling of Waste Sediment and Enhancement Mechanisms in Blended Grouting Material

Zhang

Jia

Yang

et al. 2022

Advances in Materials Science and Engineering

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“…Given that earth pressure balance shield-tunnel construction will require additives, such as surfactants, polymers, bentonite slurry, anti-wear agents, and defoamers, the effective removal of such additives in the excavated tunnel slag is the key point of its resource-use [ 13 ]. Moreover, treated TS can be used for concrete aggregate, embankment material, land backfill material, and synchronous grouting material [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Properties of Slurry Shield Tunnel Sand and Its Application in Large Flow Concrete

et al. 2022

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The amount of Slurry shield tunnel slag (SSTS) from the Beijing East Sixth Ring Road renovation project is about 3 million m3, and it is mainly fine and silt sand. In order to realize its resource utilization, the properties of SSTS and the performance of concrete with strength grades from C30-C60, which used the mixed sand compound with SSTS and Coarse Manufactured Sand (CMS) as a fine aggregate, were investigated. The results showed that SSTS’ fineness modulus is 1.2, its clay content is 17.0% but its composition is mainly Inert Silt (IS), and SSTS replaced with 40% of the mass of CMS can obtain a mixed sand with a fineness modulus of 2.7 and a clay content of 7.0%. The morphological and filling effects of SSTS and IS will improve the workability and durability properties of concrete with no adverse effects on the compressive strength. On the other hand, clay lumps in SSTS adversely affect the workability, early cracking properties, and freeze resistance of concrete, which can be alleviated by dewatering and crushing the clay lumps in SSTS.

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“…Meanwhile, about 50,000 m 3 waste soil is produced during shield tunneling construction per km. A large amount of discharged soil and muck needs to be transported, accumulated, and absorbed, causing great environmental and economic problems [ 12 ]. Due to the different geology and complex composition of the discharged soil, systematic utilization is difficult.…”

Section: Introductionmentioning

confidence: 99%

“…Yang et al [ 23 ] used waste mud to prepare backfill grouting mortar. Zhang et al [ 12 ] prepared synchronous grouting material with discharged soil from the Zhengzhou metro line 3 project in China. The discharged soil could be used by mixing with clayey or sandy content in a proper mass ratio after treatment.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of High Performance Synchronous Grouting Materials Prepared with Clay

Cui

Tan

2021

Materials

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Shield construction discharges a large amount of soil and muck. The utilization of discharged soil of shield always has high energy consumption and a low utilization rate. Meanwhile, synchronous grouting is a key process for shield tunneling. The current studies show that the synchronous grouting materials applied now generally have the problem of mismatching among filling property, fluidity, and consolidation strength. In order to study the feasibility of using the excavated soil produced by shield construction in clay stratum as synchronous grouting material, high performance synchronous grouting material was studied by taking red clay as an example, modified by epoxy resin. The fluidity, stability, and strength were measured to evaluate performance of the grout. Material test results show that the addition of waterborne epoxy resin decreases density, improves the stability, the rate of stone, and the toughness of the grouting concretion. Finally, X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) were measured to analyze the cementitious mechanism of the grout, test results demonstrated that cement hydration and curing reaction of epoxy resin happened in the grout, the formed polymer film filled the voids in the mixture and effectively bound cement hydration gel and clay particles together.

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Recycling of discharged soil from EPB shield tunnels as a sustainable raw material for synchronous grouting

Cited by 39 publications

References 19 publications

High-Volume Upcycling of Waste Sediment and Enhancement Mechanisms in Blended Grouting Material

High-Volume Upcycling of Waste Sediment and Enhancement Mechanisms in Blended Grouting Material

Properties of Slurry Shield Tunnel Sand and Its Application in Large Flow Concrete

Experimental Study of High Performance Synchronous Grouting Materials Prepared with Clay

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