Creep behaviour of two-component grout and interaction with segmental lining in tunnelling

Oggeri, Claudio; Oreste, Pierpaolo; Spagnoli, Giovanni

doi:10.1016/j.tust.2021.104216

Cited by 19 publications

(3 citation statements)

References 33 publications

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“…The present research aims to explore the application potential of loess as a filling material in mining, analyze the properties and characteristics of loess material in depth, and forecast its future application in mining activities. By means of systematic research and discussion, we attempt to provide valuable reference and theoretical support for promoting the development and optimization of mine filling technology, and encouraging the mining industry toward a more sustainable and environmental protection direction [ 16 , 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Fluidity and Strength of Loess-Based Quick Consolidated Backfill Material with One High-Water Content

Cui

Cui³

et al. 2023

Materials

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To study the flow and strength characteristics of loess-based backfill materials, orthogonal tests were used to design a cemented backfill material combining loess, high-water content materials, cement, and fly ash. By using the range, analysis of variance, and multi-variate regression analysis, influences of four key factors on the initial setting time, diffusivity, compressive strength, and shear strength of the backfill material were investigated. These four factors included the mass concentration of loess water (A), the content of high-water content materials (B), cement content (C), and content of fly ash (D). The results showed that the initial setting time, diffusivity, compressive strength, and shear strength of the backfill material were 13~33 min, 400~580 mm, 0.917–3.605 MPa, and 0.360–0.722 MPa, respectively, all distributed in wide ranges. For the initial setting time, the four factors were listed in descending order as A > D > B > C according to their influences; for diffusivity, the four factors were listed as A > B > C > D; for the compressive strength, the four factors were ranked as A > C > D > B; for the shear strength, the four factors were ranked such that A > C > D > B. With regard to the comprehensive index, the four factors were such that A > B > D > C. That is, the factors were listed in descending order as the mass concentration of loess water, cement content, the content of fly ash, and content of high-water content materials according to their significance in influencing characteristics of the loess-based backfill material. Comprehensive analysis indicated that the fluidity of the material was mainly influenced by the mass concentration of loess water, and the two were negatively correlated. The hydro-consolidation effect of materials with high-water contents accelerated material solidification. The strength of the backfill material was mainly influenced by the cement content while only slightly affected by contents of other materials. In this way, a prediction model for characteristic parameters, namely, fluidity and strength, of the loess-based backfill material under the action of various factors was established.

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Section: Introductionmentioning

confidence: 99%

Fluidity and Strength of Loess-Based Quick Consolidated Backfill Material with One High-Water Content

Cui

Cui³

et al. 2023

Materials

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“…In addition to the high stress effect, the deep roadway surrounding rock stress field will be further redistributed under the action of geological structure and mining-induced stress, resulting in discrete stress degradation and stress concentration. Currently, scholars have studied the ultra-high strength bolt, the grouting modified material, and its mechanical performance applied to the control of surrounding rocks in deep roadways [13][14][15][16][17]. The support-modification-pressure relief collaborative control method of deep roadways and the modification technology of high-pressure splitting grouting of deep roadways were put forward from the technical point of view [18,19].…”

Section: Introductionmentioning

confidence: 99%

Integrated Collaborative Control of “Shielding-Filling-Grouting” of 1 km Deep Large-Section Roadways: A Case Study

Zhang

Zhu

et al. 2022

Minerals

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Effective control of deformation failure of surrounding rock in deep roadway has become an important prerequisite for the safe and efficient development of deep coal resources. In this study, the field measurement of the study area’s in-situ stress was carried out for the specific engineering geological conditions of the KCM −967 m level west-wing main track roadway. The west-wing main track roadway’s full-section deformation failure features were summarized and analyzed, and the main roadway’s surrounding rock nonlinear deformation failure mechanism was revealed from the perspective of elastoplastic mechanics. Based on that, a set of highly targeted integrated collaborative control technology of “shielding-filling-grouting” system was proposed. The industrial field test revealed that, after the above integrated collaborative control scheme was adopted, there was no strong deformation failure on the surface of the main roadway surrounding rock and deep rock mass, which played the role of active and passive support collaborative control, reduced the subsequent repeated repair and maintenance workload of the roadway, and satisfied the needs of long-term safe and efficient production of the mine. The results obtained provide a reference for the control of surrounding rock of deep and large-section roadways in other mining areas.

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“…The results show that the deformation process of shear joints includes four stages : gap closure, elastic expansion, shear strengthening and yield failure. Through the detailed experimental study of the two-component material in the creep stage, Oggeri et al 16 think that the creep phenomenon of the two-component material can lead to the reduction of the load applied to the support system and the increase of the deformation of the tunnel wall. Ding et al 17 developed a waterproof performance test device for gaskets that can accurately simulate the amount of dislocation and opening and studied the compressive load and contact surface contact stress of several different cross-section…”

mentioning

confidence: 99%

Mechanical Behavior and Waterproof Performance of Longitudinal Section of Tunnel Segment Joint Gasket

Zhang,

Xie,

Zhao

et al. 2024

Preprint

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In the construction stage, due to construction errors and longitudinal differential settlement during tunnel operation, the amount of dislocation and opening at the segment joint increases, increasing the likelihood of water leakage. Therefore, it is necessary to conduct an in-depth study on the influence of the dislocation and opening amount at the segment joint on the contact stress of the section. Firstly, through theoretical analysis, this paper deduces that the waterproof performance of the gasket depends not only on its own contact area, linear compression stiffness, and Poisson’s ratio but also on the height of the segment joint specimen and the amount of joint opening caused by the sinking offset angle. Then, the effects of different openings and dislocations at the segment joints on the contact stress of the segment gasket section were compared using numerical simulation and model experiments. The results show that the influence of the opening amount on the waterproof performance of the tunnel segment joint’s sealing gasket is greater than that of the dislocation, and the waterproof rate of the joint of the segment sealing gasket section is greater than 40% under the modified condition.

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Creep behaviour of two-component grout and interaction with segmental lining in tunnelling

Cited by 19 publications

References 33 publications

Fluidity and Strength of Loess-Based Quick Consolidated Backfill Material with One High-Water Content

Fluidity and Strength of Loess-Based Quick Consolidated Backfill Material with One High-Water Content

Integrated Collaborative Control of “Shielding-Filling-Grouting” of 1 km Deep Large-Section Roadways: A Case Study

Mechanical Behavior and Waterproof Performance of Longitudinal Section of Tunnel Segment Joint Gasket

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