Evolution of the broken rock zone in the mixed ground tunnel based on the DSCM

Li, Yuanhai; Tang, Xiaolin; Yang, Shuo; Chen, Jiawei

doi:10.1016/j.tust.2018.11.017

Cited by 39 publications

(7 citation statements)

References 21 publications

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“…It can be understood that the physical and mechanical parameters and structural plane characteristics of the rock mass can be measured through studying the propagation characteristics of the acoustic wave in rock mass by considering acoustic waves as an information carrier. e results provided by acoustic wave testing are significant to guide ground support design [23,24]. In this study, RSM-SY5 intelligent acoustic instrument developed by Wuhan Institute of Geotechnical Mechanics of the Chinese Academy of Sciences has been adopted to detect and analyze the scope of surrounding rock loosening.…”

Section: Investigation Of Fractured Rock Massmentioning

confidence: 99%

Deformation Mechanism and Support Technology of Deep and High-Stress Soft Rock Roadway

Zheng

Zuo

et al. 2021

Advances in Civil Engineering

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In this study, the analysis and control of stability of surrounding rock in deep fractured soft rock roadway located in the underground mine of Jinfeng gold mine in Guizhou Province, China, has been investigated. The surrounding rock of roadway has been analyzed to characterize its deformation and failure mechanism through field survey, testing of rock physical and mechanical properties, in situ stress measure, analysis of mineral components of rock, and investigation of rock fragmentation degree. Based on the numerical simulation technology, the influence of different factors on the stability of roadway is studied. The physical and mechanical properties of surrounding rock and the bearing capacity of surrounding rock layer are to be improved to maintain the stability of broken soft rock roadway as high ground stress, rock fragmentation, and poor lithology leading to tunnel instability. Hence, a high-strength “cable bolt + fiber-reinforced shotcrete + steel mesh + split sets + resin bolt + cement grouting” combined support system has been proposed to improve the effective bearing structure significantly with high integrity and bearing capacity.

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Section: Investigation Of Fractured Rock Massmentioning

confidence: 99%

Deformation Mechanism and Support Technology of Deep and High-Stress Soft Rock Roadway

Zheng

Zuo

et al. 2021

Advances in Civil Engineering

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“…Furthermore, the fracture process of the front surface of the specimen was captured using a digital video camera (HDR-XR550E). The strain field was processed using PhotoInfor and PostViewer software, which were developed by Li et al 46 3 | EXPERIMENTAL RESULTS Figure 4 shows the testing results of the preflawed sandstone specimens with the same flaw angle of 45 after different high-temperature treatments. It is clear that the stress-strain curves of the sandstone specimens differed significantly when they were subjected to various high temperatures.…”

Section: Heating Loading and Monitoring Proceduresmentioning

confidence: 99%

Experimental study on fracture behaviour of three‐flawed sandstone specimens after high‐temperature treatments

Huang

Yang

Dong

2020

Fatigue Fract Eng Mat Struct

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The crack coalescence of rocks significantly affects the stability of rock engineering, and extensive studies have been performed on preflawed rock specimens without thermal treatment. However, the fracturing behaviour of preflawed specimens after thermal treatment has not been investigated comprehensively. In this study, three‐flawed sandstone specimens with different flaw inclinations after high‐temperature treatments were tested under uniaxial compression. Photographic, acoustic emission and digital image correlation techniques were used to investigate the crack initiation, propagation and coalescence behaviour. Experimental results show that the peak strength, elastic modulus and peak strain of the three‐flawed specimens were lower than those of intact specimens and that they gradually recovered with increasing flaw angle. The peak strength and elastic modulus first increased and then decreased, whereas the peak strain increased with temperature. Noncoalescence, indirect coalescence and direct coalescence were three patterns observed between the two adjacent pre‐existing flaws. Finally, the mechanism of high temperature in alteration of the mechanical properties of sandstone was revealed through microobservations.

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“…In addition, research on related issues of lining during tunnel excavation. Based on the simulation experiment, Li Y. et al (2019) used the digital speckle method to measure the surrounding rock fracture zone of the mixed foundation tunnel, and provided suggestions for different support of different regional design for the whole tunnel support. Particle Image Velocimetry (PIV), one of the digital image measurement techniques, can be used to measure the flow field in fluid mechanics (Adrian, 1991).…”

Section: Application Of Transparent Soil In Modeling Of Soil-structurmentioning

confidence: 99%

Transparent Synthetic Soil and Its Application in Modeling of Soil-Structure Interaction Using Optical System

et al. 2019

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This article introduces the uses of transparent synthetic soil for geotechnical problems using optical system, including transparent materials, sample preparation, geotechnical properties, experimental methods, and applications in physical modeling. Four typical kinds of transparent synthetic soil are shown and compared. For amorphous silica powder, normally the consolidated amorphous silica has a higher normalized strength but a lower modulus than the natural clays. For amorphous silica gels, the stressstrain behaviors are consistent with the typical stress-strain behaviors of sand for both dense and loose conditions. For fused silica, it has a higher shearing strength and higher modulus than the natural sand does; the deviatoric stress increases with the confining pressure, but the stress-strain curves of fused silica and the natural sand are particularly similar. For glass sand, with increasing of the relative density, the strainstress relationship varies from strain hardening to stress softening, while its failure form is essentially the same as that of standard sand. According to the geotechnical properties of four typical materials of transparent synthetic soil grain, they are used to simulate different conditions and analyze practical engineering problems in different physical model tests. The process included the generation of a speckle pattern created by the interaction of laser light with transparent particles. Using digital image processing technology, speckle patterns can be obtained and used to calculate the displacement field. By utilizing this optical system, transparent synthetic soil can be used to nonintrusively investigate internal soil deformation, flow problems, and ground movement in physical model tests. Finally, both the advantages and disadvantages of the transparent soil experimental technique are analyzed.

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Evolution of the broken rock zone in the mixed ground tunnel based on the DSCM

Cited by 39 publications

References 21 publications

Deformation Mechanism and Support Technology of Deep and High-Stress Soft Rock Roadway

Deformation Mechanism and Support Technology of Deep and High-Stress Soft Rock Roadway

Experimental study on fracture behaviour of three‐flawed sandstone specimens after high‐temperature treatments

Transparent Synthetic Soil and Its Application in Modeling of Soil-Structure Interaction Using Optical System

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