Back-fill grout experimental test for discharged soils reuse of the large-diameter size slurry shield tunnel

Zhou, Shunhua; Li, Xue; Chang, Jiang; Xiao, Junhua

doi:10.1007/s12205-016-0856-z

Cited by 54 publications

(18 citation statements)

References 15 publications

(13 reference statements)

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“…Shinde et al [29] reused marble dust and granite dust in injection grouts, which reduced the cost of grout by 70% to 75% less than market cost. Zhou et al [30] confirmed the feasibility of discharged sandy soil from a slurry shield tunnel as a material of back-fill grout. Çınar et al [31] investigated the effect of waste marble powder on the fluidity of cement based grout mixtures and found 15% was the upper limit of reutilization.…”

Section: Introductionmentioning

confidence: 93%

Reuse of Excavated Clayey Silt in Cement–Fly Ash–Bentonite Hybrid Back-fill Grouting during Shield Tunneling

Xiao

et al. 2020

Sustainability

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Excavated soils from tunnel construction need high treatment cost and pollute the environment. To investigate the feasibility of excavated clayey silt reused in back-fill grout, the flowability, stability and strength were taken as measurement indexes of grouting performance. The clayey silt was tested to be reused as substitutes for fly ash, bentonite and sand, respectively. The experimental results indicated that the clayey silt reused as a substitute for fly ash decreased the flowability and strength of grout mixes, and the clayey silt reused as a substitute for bentonite decreased the stability of grout mixes, and neither of them was feasible. The clayey silt reused as a substitute for sand decreased the flowability, but the grouting performance could be improved by adjusting the mix proportion to meet all grouting requirements. After adding the proportion of water to improve the flowability and increasing the cement:fly ash ratio to improve the strength, a scheme of clayey silt reutilization was suggested, which was cement:fly ash:bentonite:clayey silt:water = 280:230:100:680:660. At the end of this paper, the pore structure feature tests, X-ray diffraction (XRD) tests and scanning electron microscope (SEM) tests were performed to analyze the different morphology, microstructure and mineralogy characteristics before and after the clayey silt was reused as a total substitute for sand in grout mixes.

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Section: Introductionmentioning

confidence: 93%

Reuse of Excavated Clayey Silt in Cement–Fly Ash–Bentonite Hybrid Back-fill Grouting during Shield Tunneling

Xiao

et al. 2020

Sustainability

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“…e measured earth pressure fluctuated a week after tail passing. e measured total earth pressure acting on the crown level and [6]. w � water content, c � natural unit weight of the soil, e � void ratio, E s � compression modulus of the soil, C � cohesion, φ � angle of internal friction, f � bearing capacity of the ground, C u � the uniformity coefficient, and C c � the curvature coefficient.…”

Section: 1mentioning

confidence: 99%

“…Multiple factors influencing the earth pressure around the tunnel lining, including the engineering geology, the depth of the overburden, the ground water level, the excavation method, interactions between the lining and soil and the construction behaviour, operational parameters, and grouting parameters, have been indicated by many scholars [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Observed Ground Pressure Acting on the Lining of a Large‐Diameter Shield Tunnel in Sandy Stratum under High Water Pressure

Zhou

2020

Advances in Civil Engineering

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Accurately evaluating the ground pressure on the tunnel lining greatly helps the structure design of a tunnel. In this study, the earth pressure and water pressure on the tunnel lining of four cross sections of a metro tunnel were measured and analyzed and then compared with the theoretical values. Results show that the values and distribution of observed ground pressure acting on the lining are different for different overburden depths. The water pressure measured on-site is approximately equal to the theoretical hydrostatic pressure. The water pressure acting on the shield tunnel lining does not fluctuate with the shield tunnel excavation. The maximum ground pressure was measured in the process of backfill grouting, and the maximum values are approximately larger than 30% of the stable value of the measured pressure. For a shield tunnel under a river with deep water, the water pressure on the lining is dominant and the observed total ground pressure is nearly equal to the water pressure. The findings presented in this paper can provide a reference for the structure design of similar tunnel projects.

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“…Zhong et al [ 19 ] studied the reuse of fine sand discharged from shield excavation for grouting behind the lining. Zhou et al [ 20 ] explored in-situ recycle of excavated sandy soil in the Nanjing Yangtze River tunnel project as the back-fill grout instead of purchased sand. Zhang et al [ 21 ] used waste mud of slurry shield and fine sand as synchronous grouting materials.…”

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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Back-fill grout experimental test for discharged soils reuse of the large-diameter size slurry shield tunnel

Cited by 54 publications

References 15 publications

Reuse of Excavated Clayey Silt in Cement–Fly Ash–Bentonite Hybrid Back-fill Grouting during Shield Tunneling

Reuse of Excavated Clayey Silt in Cement–Fly Ash–Bentonite Hybrid Back-fill Grouting during Shield Tunneling

Observed Ground Pressure Acting on the Lining of a Large‐Diameter Shield Tunnel in Sandy Stratum under High Water Pressure

Experimental Study of High Performance Synchronous Grouting Materials Prepared with Clay

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