Study on the Interaction of Collinear Cracks and Wing Cracks and Cracking Behavior of Rock under Uniaxial Compression

Wang, Chaolin; Yu, Zhonghua; Zhao, Yanlin; Wan, Wen

doi:10.1155/2018/5459307

Cited by 15 publications

(11 citation statements)

References 27 publications

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“…In order to ensure the smooth excavation of the tunnel, the full-section curtain grouting method is used to block water and reinforce the tunnel. 4 Geofluids igneous orientation arrangement. According to the survey data, the rocks are divided into four weathering layers, namely, total weathering, strong weathering, moderate weathering, and breeze weathering, which are mainly composed of variable granitic structure, scaly crystalline structure, and block-shaped and gin-shaped structure.…”

Section: Engineering Backgroundmentioning

confidence: 99%

“…In the process of tunnel excavation, water and mud inrush often occurs [1][2][3]. Although people have made considerable progress in understanding the mechanical properties of rock mass [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] and theories and technologies of tunnel excavation and support have been greatly developed [21][22][23][24][25], it still cannot completely contain the occurrence of water and mud inrush. Every year, water and mud inrush still causes a large number of equipment losses and casualties [26].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Grouting Treatment of Water and Mud Inrush in Fully Weathered Granite Tunnel: A Case Study

et al. 2020

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When mountain tunnel passes through completely weathered granite strata, water and mud inrush is easy to occur, causing casualties and economic losses. Grouting is a common and effective treatment method for water and mud inrush disaster. The current existing researches focus on theoretical analysis, numerical simulation, and laboratory test, and the researches based on the field of engineering application are few. Based on the fully weathered granite tunnel of Junchang tunnel in Guangxi, this paper studies the grouting treatment of water and mud disaster in the fully weathered granite tunnel. This paper first introduces the geological and hydrological conditions of Junchang tunnel in order to understand the causes of water inrush and mud inrush. Then, the treatment method of full-section curtain grouting is introduced. During the grouting, the combination of exploration and injection is adopted. According to different hydrological conditions, different kinds of grouting materials are adopted. After grouting is completed, Transient Electromagnetic Methods, water inflow analysis, borehole investigation, and P-Q-T method are used to evaluate the grouting effect. According to the reaction of the detection results, the weak part of grouting can be supplemented to improve the grouting quality. The results show that the curtain grouting is effective for the treatment of water-mud inrush disaster in the fully weathered granite tunnel. This study provides a reference for the treatment of water and mud inrush in other similar tunnels.

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Section: Engineering Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Grouting Treatment of Water and Mud Inrush in Fully Weathered Granite Tunnel: A Case Study

et al. 2020

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“…Therefore, rock damage induced by blasting load can be divided into compression damage and tension damage. Meanwhile, rock is more sensitive to tensile stress because of the lower tensile strength of rock [31][32][33]. Thus, rock mainly showed as tension damage and many tension cracks will appear result in rock fragmentation under dynamic load [34][35][36][37].…”

Section: Materials Modelsmentioning

confidence: 99%

Investigation of Burn Cut Parameters and Model for One-Step Raise Excavation Based on Damage Evolution Mechanisms

Qiu

2020

Geofluids

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One-step raise excavation with burn cut is a kind of technology which use the drilling and blasting method to excavate the raise quickly. Due to the limitation of the free surface in burn cut, determination of cut parameters such as the length of burden and diameters of empty hole and charge hole is important to achieve a good effect of cut blasting. Meanwhile, the choice of the cut model is also crucial to form a proper opening. In this study, a modified Holmquist-Johnson-Cook (HJC) model, in which the tension-compression damage model and tension-compression strain rate effect model are considered, is embedded in the LS-DYNA software to investigate the damage evolution of rock in cut blasting. A simplified numerical model of burn cut is built in the LS-DYNA. The numerical results indicate that there is a threshold value of the burden length to maximize the opening. The empty hole has the effect of transferring blasting energy, and the effect becomes more obvious with the increase of the hole size. Moreover, the linear charge density of the prime cut hole can affect the compression and tension damage. Further, the comparison among four typical burn cut models are conducted based on numerical results. It demonstrates that triangular prism cut and doliform cut, which have more empty holes arrangement surrounding the prime cut hole, are better than spiral cut and diamond cut that with less empty holes locating one side of the prime cut hole in terms of energy efficiency and damage zone control.

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“…The results showed that the filling material can reduce the tip stress. Wang [26] studied the crack interaction, initiation and propagation of rock-like materials with two collinear fissures. The results showed that with the growth of wing cracks, the stress intensity factor of wing cracks first decreases and then tends to be stable.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Strength and Characteristics of Sandstone Samples with Combined Double Hole and Double Fissure Defects

Ning

Wang

et al. 2021

Sustainability

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To explore the failure mechanism of rock with holes and fissures, uniaxial compression tests of sandstone samples with combined double hole and double fissure defects were carried out using Particle Flow Code 2D (PFC2D) numerical simulation software. The failure behaviour and mechanical properties of the sandstone samples with combined double hole and double fissure defects at different angles were analysed, and the evolution results of the stress field and crack propagation were studied. The results show that with a decrease in fissure angle, the crack initiation stress, damage stress, elastic modulus and peak stress of the defective rock decrease, while the peak strain increases, and the brittleness of the rock is weakened. Rocks with combined double hole and double fissure defects at different angles lead to different failure modes, crack initiation positions and crack development directions. After uniaxial compression, both compressive stress and tensile stress concentration areas are produced in the defective rock, but the compressive stress concentration is of primary importance. The concentration area is mainly distributed around the holes and fissures and the defect connecting line, and the stress concentration area decreases with the decreasing fissure angle. This study can correctly predict the mechanical properties of rock with combined double hole and double fissure defects at different angles and provide a reference for actual rock engineering.

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Study on the Interaction of Collinear Cracks and Wing Cracks and Cracking Behavior of Rock under Uniaxial Compression

Cited by 15 publications

References 27 publications

Grouting Treatment of Water and Mud Inrush in Fully Weathered Granite Tunnel: A Case Study

Grouting Treatment of Water and Mud Inrush in Fully Weathered Granite Tunnel: A Case Study

Investigation of Burn Cut Parameters and Model for One-Step Raise Excavation Based on Damage Evolution Mechanisms

Numerical Study of the Strength and Characteristics of Sandstone Samples with Combined Double Hole and Double Fissure Defects

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