Numerical Simulation and Analysis of Rock under Hydraulic Fracturing Based on Acoustic Emission Monitoring

2011 ◽  
Vol 382 ◽  
pp. 458-461
Author(s):  
Zhi Qiang Kang ◽  
Yun Fei Zhou ◽  
Run Sheng Wang
Keyword(s):  
Numerical Simulation ◽  
Hydraulic Fracturing ◽  
Mine Water ◽  
Water Pressure ◽  
Overburden Rock ◽  
Deep Mining ◽  
Water Seepage ◽  
Vertical Loading ◽  
Rock Structure ◽  
Fracturing Process

According to the problem of mine water bursting frequent accidents when Mine into the deep mining. Based on the theory of fluid-solid coupling, accounting for the effect on permeability by damage and stress. Analysis of influence factors what hydraulic fracturing process, fracture propagation pattern, and influencing factors including shape and magnitude of inlet hole, stress conditions, and specimen strength were investigated. Hydraulic fracturing is not only a natural action but also an artificial method to alter rock structure. Application of rock failure process analysis software coupled seepage-stress F-RFPA2D, numerical simulated rock water pressure to cause crack rupture instability process, research the fracture law of the rock on water pressure and vertical loading. Combine similar physical experiment model, contrast analysis of two broken results and stress-strain curve, reveals instability mechanical behavior of rock hydraulic fracture process. Obtain deep mining in the process of mine water seepage and water extrude, overburden rock crack up, expand, water seepage, water extrude, instability rupture process rules. numerical simulation results and experimental results has good uniformity, for disaster of the mine water extrude has immeasurable prediction practical.

The Study of Fractured Rock Mass Instability of the Law Based on the Hydraulic Fracturing

2012 ◽  
Vol 496 ◽  
pp. 538-541
Author(s):  
Zhi Qiang Kang ◽  
Wein Jie Li ◽  
Yu Bo Jia
Keyword(s):  
Rock Mass ◽  
Hydraulic Fracturing ◽  
Hydraulic Fracture ◽  
Fractured Rock ◽  
Water Pressure ◽  
Overburden Rock ◽  
Fractured Rock Mass ◽  
Water Seepage ◽  
Vertical Loading ◽  
The Law

Fractured rock mass, Hydraulic fracture, RFPA2D-Flow, Instability of the law. Abstract. Based on the theory of fluid-solid coupling, Studying on the effect of permeability about damage and stress, Analysis of influence factors what hydraulic fracturing process, fracture propagation pattern, and influencing factors including shape and magnitude of inlet hole, stress conditions, and specimen strength were investigated. Application of rock failure process analysis software coupled seepage-stress F-RFPA2D, numerical simulated rock water pressure to cause crack rupture instability process, research the fracture law of the rock on water pressure and vertical loading. Combine similar physical experiment model, contrast analysis of two broken results and stress-strain curve, reveals instability mechanical behavior of rock hydraulic fracture process. Obtain deep mining in the process of mine water seepage and water extrude, overburden rock crack up, expand, water seepage, water extrude, instability rupture process rules.

Study on Experimental Simulation of Rocks under Hydraulic Fracturing

2012 ◽  
Vol 459 ◽  
pp. 252-256
Author(s):  
Zhi Qiang Kang ◽  
Yu Bo Jia ◽  
Run Sheng Wang
Keyword(s):  
Hydraulic Fracturing ◽  
Mine Water ◽  
Water Pressure ◽  
Rock Fracture ◽  
Experimental Results ◽  
Experimental Simulation ◽  
Rock Fracturing ◽  
Deep Mining ◽  
Vertical Loading ◽  
Water Bursting

In order to further research the expansion of cracks in the rock during hydraulic fracturing, this paper theoretically analyzes the stress state of wall cracks. According to the effective stress criterion of Terzgahi, it gives the mechanical condition of the rock crack expansion. By Moore-coulomb's law, it analyzes the influence of the water pressure in the pores of space wall on the rock fracturing. On this basis, the hydraulic rock fracturing is applied to build physical experiment model of deep mining mine water bursting. By the methodology of combining the analysis of experimental results and theoretical analysis, it analyzes the change of water injection pressure in the hole with rock fracturing and the stress strain relations during rock’s uniform displacement change and loading. The experimental results show that in the process of the water pressure and vertical loading, the increasing fracture load on the rock, constantly produces, expands the cracks and fractures to instability; the mutual influence of water and pressure comes to be the major problem of deep mining rock fracture and mine water bursting.

scholarly journals Application of DICM on Similar Material Simulation Experiment for Rock-Like Materials

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Hailing Kong ◽  
Luzhen Wang ◽  
Guoqing Gu ◽  
Bing Xu
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Correlation Method ◽  
Image Correlation ◽  
Similar Material ◽  
Full Field ◽  
Rock Structure ◽  
Fracturing Process ◽  
Similar Material Simulation ◽  
Overlying Strata

The digital image correlation method (DICM) has been applied to similar material simulation experiments for rock-like materials, to overcome the weakness of traditional measurements, for example, data discontinuous. In this paper, the movement and fracturing process of the overlying strata during excavation are observed and studied, and the distributions of stress, strain, and deformation in the overlying strata are obtained based on similar material simulation. The DICM is applied to improve the testing method and to optimize the discontinuity of testing points; of course, the difference of rock deformation in the overlying strata during excavation is considered. Full-field deformation and strain are analyzed by the DICM. To verify the accuracy of the DICM, results obtained from the DICM, numerical simulation and similar material simulation, are compared. The DICM can reflect the characteristics of locality and randomness of rock-like materials more real than numerical simulation, and comparing with similar material simulation, it can directly reproduce the movement and fracturing process of the overlying strata during full-field excavation. It shows that, the DICM is entirely feasible to using in the large scale full-field deformation measurement on complex rock structure, and it is of theoretical importance for testing for rock-like materials.

scholarly journals Numerical Analysis of the Hydraulic Fracturing of Pressure Tunnel Lining Based on the 2P-IKSPH Method

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Shuyang Yu ◽  
Xuhua Ren ◽  
Haijun Wang ◽  
Jixun Zhang ◽  
Zhaohua Sun
Keyword(s):  
Hydraulic Fracturing ◽  
Water Pressure ◽  
Particle Interaction ◽  
Surrounding Rock ◽  
Tunnel Lining ◽  
Stress Wave Propagation ◽  
Fracture Mechanisms ◽  
Pressure Tunnel ◽  
Fracturing Process ◽  
Searching Method

In order to investigate the fracture mechanisms of the pressure tunnel lining under water-stress coupling, based on the traditional smoothed particle hydrodynamics (SPH) method, the solid-water particle interaction method, and the particle damage conversion algorithm are proposed to realize the hydraulic fracturing process, which is called the 2P-IKSPH method. The “particle domain searching method,” the “birth-and-death particle method,” and the “group discrimination searching method” have also been proposed to realize the simulations of complex processes of excavation, lining, and operation of the hydraulic tunnel. Taking the Guzeng hydraulic tunnel as an engineering example, the hydraulic fracturing of tunnel lining under different conditions is numerically simulated. Results show the following: (1) the 2P-IKSPH method can dynamically reflect the stress wave propagation processes of surrounding rock and the damage process of tunnel lining. (2) The lining damage mainly occurs on the vault and the arch foot. (3) The critical internal water pressure increases with the increase of the tunnel buried depth and the thickness of lining, but increases first and then decreases with the increase of the surrounding rock mass grade. The research results can provide some references for the optimization designs of tunnel lining and reinforcement of similar projects. Meanwhile, developing 3D parallelization program based on 2P-IKSPH will be the future research directions.

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