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Mu C.-M.,Anhui University of Science and Technology | Mu C.-M.,Key Laboratory of Mining Coal Safety and Efficiently Constructed by Anhui Province and Ministry of Educ | Pan F.,Anhui University of Science and Technology | Pan F.,Key Laboratory of Mining Coal Safety and Efficiently Constructed by Anhui Province and Ministry of Educ
Gaoya Wuli Xuebao/Chinese Journal of High Pressure Physics | Year: 2013

In order to investigate on cracks propagation of the coal under column charge blasting subjected to geostatic stress, the damage constitutive model was established by considering tension and compression. The improved damage constitutive model was embedded in the FEM software to study the mechanics of cracks propagation coupled by blasting loads and geostatic stress. The precision of simulation is proved because the numerical results are in good with model experiments. The results show that the interaction of the compression wave and unloading wave yield cracks in the coal. The cracks are somewhat inhibited by geostatic stress. The direction of cracks is in accordance with the major principal stress.


Mu C.-M.,Anhui University of Science and Technology | Mu C.-M.,Key Laboratory of Mining Coal Safety and Efficiently Constructed by Anhui Province and Ministry of Educ | Wang H.-L.,Anhui University of Science and Technology | Wang H.-L.,Key Laboratory of Mining Coal Safety and Efficiently Constructed by Anhui Province and Ministry of Educ
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

In order to study the mechanism of high pressure water jetting on the coal, the damage mechanism of high pressure water jetting on the coal is investigated by using numerical simulation, which is based on coal using J-H-C damage constitutive model and water jet using Bridgman equation. Based on fluid-solid coupling penalty function, a mode of numerical algorithm, the various damage forms of the coal are gained under different jetting pressures of water. The numerical calculated values are in good agreement with experimental results. The numerical simulation results show that, different water pressures of jet flow cause different damage patterns in coal. The shape of damage caused by jetting in the coal is staged and the recombination action of compression stress wave and tensile stress wave is the main factor that results in coal damage. With penetration evolving, compression zone and tensile zone reduce that are formed by high water. There is the critical breakdown pressure of water on the coal that has different fracture strength.

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