Investigation on crack propagation perpendicular to mortar–rock interface: experimental and numerical

Wang, Hongwei; Wu, Zhenlin; Wang, Yan-Jie; Yu, Rena C.

doi:10.1007/s10704-020-00477-9

Cited by 10 publications

(5 citation statements)

References 41 publications

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“…The grouted arrest measure, y = 349.5x + 1713.67 (R 2 = 0.95) (7) The anchored crack arrest measure,…”

Section: Fracture Propagationmentioning

confidence: 99%

“…The holes and cracks in a rock seriously affect the mechanical properties of the rock [1][2][3][4]. The expansion of cracks leads to rock instability and damage, which ultimately affects the safe and efficient operation of coal mines [5][6][7][8][9]. Many scholars have done a lot of research on the crack arrest measures of fractured rock [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Impact Tendency and Sensitivity of Fractured Rock with Different Crack Arrest Measures

Liu

Xiao

et al. 2022

Sustainability

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Crack propagation leads to rock instability and failure, which seriously influence the safe and efficient operation of coal mines. According to the characteristics of fracture development and expansion, this paper takes a fractured rock with different crack numbers as the research background and studies the effects of the grouted arrest measure, anchored crack arrest measure, and grouted anchored arrest measure on the mechanical properties, energy evolution, crack expansion, and progressive instability of the fractured rock. The sensitivity of different crack arrest measures to the peak strength, elastic modulus, total crack number, and impact tendency of the fractured rock are analyzed based on the sensitive percentage. The experimental results show that the more cracks in the rock, the greater the increase of peak stress of grouted rock and grouted anchored rock, and the smaller the increase of peak stress of anchored fractured rock. With the increase of the crack number, the total crack number in anchored fractured rock specimens gradually decrease, the total crack number in grouted rocks, and grouted anchored rock specimens gradually increase. The anchored fractured rock with more cracks produces a lower total crack number when it is destroyed. The grouted rock and grouted anchored rock with more cracks produce a higher total crack number when it is destroyed. The pre-peak energy of anchored single-fractured rock is larger, the pre-peak energy of grouting multi-fractured rock is larger, and the grouted rock has a strong impact tendency. The grouted arrest measure is an important sensitive parameter to the impact energy index; the anchored crack arrest measure is the primary sensitive parameter to the peak stress, elastic modulus, and total crack number; and the grouted anchored arrest measure is an important sensitive parameter to the elastic modulus. The research results of this paper provide some guidance on the selection of crack arrest parameters and scheme design in practical rock engineering.

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“…The grouted arrest measure, y = 349.5x + 1713.67 (R 2 = 0.95) (7) The anchored crack arrest measure,…”

Section: Fracture Propagationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Impact Tendency and Sensitivity of Fractured Rock with Different Crack Arrest Measures

Liu

Xiao

et al. 2022

Sustainability

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“…Yan, Long [16] found that the shear stress at the mortar-rock interface was much smaller than that at the bolt-mortar interface for bolted rock slopes containing weak interlayers, and the shear stress distribution and the debonding damage process at the bolted interface of slopes under seismic action were obtained. Wang, Wu [17] proposed a criterion for crack extension of layered mortarrock beams based on the stress-intensity factor and, on this basis, presented a numerical method to predict the crack extension process of laminated mortar-rock beams under type I fracture. Qiu, Zhu [18] examined the dynamic behavior of flow cracks crossing the mortar-rock interface under impact loading and found that the crack expansion rate of the mortar-granite specimen was about twice as fast as that of the granite specimen, whereas the difference in the rate of the sandstone-mortar specimen was smaller.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis for Shear Behavior of Binary Interfaces under Different Bonded Conditions

Lv,

Han,

Zhang

et al. 2024

Applied Sciences

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The shear performance of the binary interface formed by mortar and rock cementation is a key factor influencing the stability and safety of basic engineering projects related to livelihood and economy since concrete has become one of the most widely used materials in engineering. Therefore, it is an urgent practical problem to further explore and clarify the shear failure mechanism of the mortar–rock binary interface. In response to the current research objective focused on fully bonded interfaces, this paper constructed binary interface models with different bonded conditions to perform direct shear experiments using numerical simulation methods, and the effect of bonded conditions on the shear behavior of the mortar–rock binary interface was analyzed. The results indicate that the bonded conditions have a significant influence on the shear mechanical behavior of the mortar–rock binary interface, which is mainly reflected in the stress-displacement curve characteristics, the shear strength, the fracture development and the stress distribution state. The research findings are of great theoretical significance for the further study of shear mechanics at the mortar–rock binary interface and of great practical significance for safe construction, resource conservation and disaster warning.

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“…It was found that the crack network extended and penetrated at the roof separation, and the dangerous region was penetrated by cracks formed inside the roof. Wang et al [13] proposed a crack propagation criterion to predict the crack propagation process for mode I fracture based on the stress intensity factor. The proposed numerical method can effectively predict the crack propagation process of layered composite beams.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Seepage and Fracture Characteristics of Cemented Rock Samples under Triaxial Stress

2021

Lithosphere

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To study the seepage and fracture characteristics of cemented rock strata, a series of triaxial seepage tests on cemented rock samples under different confining pressures and water pressures were carried out in this study. The triaxial strength, elastic modulus, volume strain, and the permeability of the cemented rock samples were analyzed by the seepage unit connection probability model and Kozeny-Carman model. Based on test results, the stress state of cemented rock samples was divided into four stages: nonlinear compaction stage, linear elastic stage, stress yield stage, and failure and postfailure stage. The triaxial strength of the cemented rock samples gradually increased with the increase of confining pressure but decreased with the increase of water pressure. The elastic modulus of the cemented rock sample increased with the increase of confining pressure but decreased with the increase of water pressure. Besides, the volume strain of the cemented rock sample was analyzed, and the volume strain change of the cemented rock sample was also classified into three stages: the increasing stage of crack volume strain, the stable stage of crack volume strain, and the decreasing stage of crack volume strain. Based on the results of triaxial seepage tests, the evolution of permeability was divided into the declining stage, increasing stage, and redescend stage. Through the seepage unit connection probability model and Kozeny-Carman model, the evolution of crack volume was obtained, and the evolution of crack volume with axial strain was also classified into three stages: the original pore closure stage, crack network expansion stage, and crack network closure stage. The permeability evolution and the crack volume evolution were also compared. The comparison results suggest that three stages of crack volume evolution are all ahead of three stages of permeability evolution, verifying that the crack propagation induces the formation of seepage channels in cemented rock samples. This research will provide a valuable reference for the study of instability and water inrush mechanism in cemented rock strata.

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Investigation on crack propagation perpendicular to mortar–rock interface: experimental and numerical

Cited by 10 publications

References 41 publications

Analysis of Impact Tendency and Sensitivity of Fractured Rock with Different Crack Arrest Measures

Analysis of Impact Tendency and Sensitivity of Fractured Rock with Different Crack Arrest Measures

Numerical Analysis for Shear Behavior of Binary Interfaces under Different Bonded Conditions

Experimental Study on Seepage and Fracture Characteristics of Cemented Rock Samples under Triaxial Stress

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