Experimental study on the prediction of rockburst hazards induced by dynamic structural plane shearing in deeply buried hard rock tunnels

Meng, Fanzhen; Zhou, Hui; Wang, Zaiquan; Zhang, Liming; Kong, Liang; Li, Shaojun; Zhang, Chuanqing

doi:10.1016/j.ijrmms.2016.04.013

Cited by 134 publications

(31 citation statements)

References 35 publications

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“…Scholars have reached a consensus that the layer-crack structure makes an essential contribution to rib spalling or rock burst in brittle coal or rock mass [13,[34][35][36][37][38][39]. Figure 9 illustrates the general occurrence mechanism of rock burst related to the layer-crack strucutre.…”

Section: Discussionmentioning

confidence: 99%

Influence of Fissure Number on the Mechanical Properties of Layer‐Crack Rock Models under Uniaxial Compression

Tan

Guo

Zhao

et al. 2018

Advances in Civil Engineering

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Many case studies have revealed that rock bursts generally occur in the high stress concentration area where layer-crack structures often exist, especially for brittle coal or rock masses. Understanding the mechanical properties of layer-crack rock models is beneficial for rational design and stability analysis of rock engineering project and rock burst prevention. This study experimentally investigated the influence of fissure number on the mechanical properties of layer-crack rock models through uniaxial compression tests. The digital speckle correlation method (DSCM) and acoustic emission (AE) techniques were applied to record and analyze the information of deformation and failure processes. Test results show the following: the bearing capacity of layer-crack specimen decreases compared with intact specimen, but their failure modes are similar, which are the splitting failure accompanied with local shear failure; the nonuniform deformation phenomenon begins to appear at the elastic deformation stage for layer-crack specimens; the AE behavior of intact specimens consists of three stages, that is, active stage, quiet stage, and major active stage, but for layer-crack specimens, it is characteristic by three peaks without quiet stage. In addition, as the fissure number of layer-crack specimens increases, the bearing capacity of specimens decreases, the appearing time of nonuniform deformation phenomenon in the specimen surface decreases, the AE events are denser and denser in each peak stage, and the risk of dynamic instability of layer-crack structure increases. At last, the failure mechanism of layer-crack structure and the related mitigation advices were discussed based on the test results. In general, the novelty is that this paper focuses on the failure mechanism of layer-crack structure directly.

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Section: Discussionmentioning

confidence: 99%

Influence of Fissure Number on the Mechanical Properties of Layer‐Crack Rock Models under Uniaxial Compression

Tan

Guo

Zhao

et al. 2018

Advances in Civil Engineering

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“…Caused by Roof Cutting. When a hard, thick, main roof occurs directly above a coal seam, it is easily suspended at a large scale owing to its high stiffness and strength, which results in highly concentrated stress in the surrounding rock of the roadway [31][32][33][34]. Hence, if the roof is presplit by blasting in a certain range outside the GSE, the length of the cantilever block can be reduced, and the caved rock block can be squeezed and bitten with the noncaved block to form a stable articulated structure, thus reducing the pressure and alleviating the deformation of the rock surrounding the GSE.…”

Section: Overburden Structure and Pressure-relief Principlementioning

confidence: 99%

Analysis of Overburden Structure and Pressure‐Relief Effect of Hard Roof Blasting and Cutting

Liu

Dai

Jiang

et al. 2019

Advances in Civil Engineering

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When studying the pressure-relief effect of hard roof blasting and cutting, the roof-cutting position and angle obviously affect the stability of the rock surrounding the gob-side entry (GSE). In this paper, control of the large deformation of rock surrounding the GSE is evaluated on the basis of the overlying structure and pressure-relief principle caused by roof cutting. Moreover, a mechanics model of a three-hinged arch structure (THAS) and a universal distinct element code (UDEC) numerical model with regard to the overlying rock movement were established to study the relationship among the rotation angle of key blocks in the THAS, the width of the roadway and the wall force beside it, and the optimal cutting position and cutting angle to reveal the pressure-relief effect of roof blasting and cutting and its influence on the support stability of the roadway. The results show that the overlying rock can form a stable THAS after roof blasting and cutting and that the wall stress and the coal-wall displacement are small, which indicates that roof blasting and cutting results in obvious pressure relief. The wall force increases with an increase in the rotation angle of the key block and decreases with an increase in the roadway width. Moreover, the optimal roof-cutting position (5 m) and angle (15°) are obtained with the specific mining conditions. Finally, on-site monitoring of the anchor-cable force and support force in panel 5312 of the Jining no. 3 coal mine is used to verify the pressure-relief effect after roof blasting and cutting. The study results can provide a theoretical basis for reasonable technical means and optimization of supporting parameters in field observation and have important application value for roof cutting and pressure relief for GSE retaining (GSER) technology.

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“…The total energy of the rock sample absorbed from external forces transforms to elastic strain energy and dissipated energy, and the distribution ratio of the two parts would affect rock deformation. For example, a sudden release of elastic strain energy would lead to instability and even failure of surrounding rock in some deep earth engineering [31][32][33][34]. Thus, in-depth analysis of the relationship between the ratio of elastic strain energy to total absorbed energy / e U U and the treated temperature under three different loading paths is required.…”

Section: Influence Of Temperature On Characteristic Energy Valuesmentioning

confidence: 99%

Experimental investigation of mechanical properties and energy features of granite after heat treatment under different loading paths

Zhang

Kang

2017

Teh. vjesn.

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EXPERIMENTAL INVESTIGATION OF MECHANICAL PROPERTIES AND ENERGY FEATURES OF GRANITE AFTER HEAT TREATMENT UNDER DIFFERENT LOADING PATHSJunwen Zhang, Xu Chen, Hengyi KangOriginal scientific paper Temperature and loading history are the two main factors that influence rock microstructure and physical and mechanical properties. To explore the influence of heat treatment and loading path on mechanical properties and energy features of granite, granite samples were first heat-treated at 25 °C, 300 °C, 600 °C, and 900 °C. Then, 12 groups of triaxial compression experiments were placed under three loading paths, as follows: uniaxial compression, conventional triaxial compression, and confining pressure unloading. Mechanical properties and energy features in the deformation and failure process based on these experimental results were systematically compared and analyzed. Results demonstrate that Young's modulus, uniaxial compressive strength, and triaxial compressive strength increased in the temperature range of 25 °C to 300 °C, but decreased in the temperature range of 300 °C to 900 °C. Under the same loading path, the gaps among total absorbed energy, dissipated energy, and elastic strain energy widened with increasing temperature from 25 °C to 900 °C. At the same temperature, the energy features' gap under confining pressure unloading is between uniaxial and triaxial compression. The conclusions drawn in this study provide a significant reference for the design and construction of rock engineering exposed to high temperature. Keywords: energy features; heat treatment; loading paths; triaxial compression Eksperimentalno ispitivanje mehaničkih svojstava i energetskih svojstava granita nakon toplinske obrade pri različitom načinu opterećenjaIzvorni znanstveni članak Povijest temperature i opterećenja dva su glavna čimbenika koji utječu na mikrostrukturu stijene i fizikalna i mehanička svojstva. Da bi se istražio utjecaj toplinske obrade i opterećenja na mehanička svojstva i energetske značajke granita, uzorci granita najprije su toplinski obrađeni na 25 °C, 300 °C, 600 °C i 900° C. Zatim je 12 skupina eksperimenata troosnog sabijanja podvrgnuto opterećenju na tri načina, kako slijedi: jednoosno sabijanje, konvencionalno troosno sabijanje i ograničeno tlačno rasterećenje. Sustavno se uspoređuju i analiziraju mehanička svojstva i značajke energije u procesu deformacije i oštećenja na temelju tih eksperimentalnih rezultata. Rezultati pokazuju da su Youngov modul, jednoosna tlačna čvrstoća i troosna tlačna čvrstoća porasli u temperaturnom području od 25 °C do 300 °C, ali su se smanjili u temperaturnom području od 300 °C do 900 °C. Pod istim načinima opterećenja, razlike između ukupne apsorbirane energije, raspršene energije i elastične energije naprezanja povećale su se s porastom temperature od 25 °C do 900 °C. Pri istoj temperaturi, razlika između energetskih značajki pod rasterećenjem ograničenim tlakom je između jednoosnog i troosnog sabijanja. Zaključci izneseni u ovoj studiji pružaju značajnu referencu za projektiranje...

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Experimental study on the prediction of rockburst hazards induced by dynamic structural plane shearing in deeply buried hard rock tunnels

Cited by 134 publications

References 35 publications

Influence of Fissure Number on the Mechanical Properties of Layer‐Crack Rock Models under Uniaxial Compression

Influence of Fissure Number on the Mechanical Properties of Layer‐Crack Rock Models under Uniaxial Compression

Analysis of Overburden Structure and Pressure‐Relief Effect of Hard Roof Blasting and Cutting

Experimental investigation of mechanical properties and energy features of granite after heat treatment under different loading paths

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