The damage constitutive relation of entire rock failure process was established using the theory of representative volume element obeying the Iognormal distribution law, and the integrated damages constitutive model o...
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The damage constitutive relation of entire rock failure process was established using the theory of representative volume element obeying the Iognormal distribution law, and the integrated damages constitutive model of rock under triaxial compression was established. Comparing with triaxial compression test result, it shows that this model correctly reflects the relationship of stress-strain. At the same time, according to the principle of the rock fatigue failure that conforms to completely the static entire process curve, a new method of establishing cyclic fatigue damage evolution equation was discussed, this method form is simple and the physics significance is clear, it may join preferably the damage relations of the rock static entire process curve.
In order to predict the absolute gas emission quantity of mining coal face, the improved grey model GM (1,1) was built based on dealing with the initial data of the gas emission quantity of mining coal face by natural...
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In order to predict the absolute gas emission quantity of mining coal face, the improved grey model GM (1,1) was built based on dealing with the initial data of the gas emission quantity of mining coal face by natural logarithm. The improved grey Markov prediction mode was built through uniting the improved grey model (1,1) and the Markov model. Use this model to analyze and predict the the gas emission quantity of the first mining coal face in Zhongling Mine. It shows that the forecast result of grey Markov prediction model has better fitting precision and correct dependability. It has certain general employing.
The effects of strain field, coalification degree and externally applied electronic field on the seepage performance of methane gas in coal are studied. It is shown that, the greater the stress (strain) in coal, the l...
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The effects of strain field, coalification degree and externally applied electronic field on the seepage performance of methane gas in coal are studied. It is shown that, the greater the stress (strain) in coal, the less the permeability coefficient of methane gas in the coal;when the stress (strain) is the same, the higher the coalificaton degree, the less the permeability coefficient;the stronger the externally applied electric field, the greater the permeability coefficient. The modified Darcy's law under the effects of stress field and electronic field are presented.
Probed into a new method to measure in-situ stress - core deformation method, which depends on measuring the variation of core diameter. Assured its serviceability through the preparatory experiment and the actual mea...
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Probed into a new method to measure in-situ stress - core deformation method, which depends on measuring the variation of core diameter. Assured its serviceability through the preparatory experiment and the actual measurement. The results show that the principal stress value and the principal stress direction in plane correspond with the loading. Moreover, investigated the relation among the P wave velocity, the micro-crack in rock with the variation of core diameter. The core deformation method supplies the in-situ stress measurement with a new method, Because it doesn't need to arrange the core and it can apply to a variety of stones under un-failure.
An activated sludge process model was established using 1-D flux model of the secondary settling tank coupled with ASM2, and was applied to certain wastewater treatment plant (WWTP) in Chongqing. This model could simu...
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An activated sludge process model was established using 1-D flux model of the secondary settling tank coupled with ASM2, and was applied to certain wastewater treatment plant (WWTP) in Chongqing. This model could simulate relatively well the COD, SS, TN and TP in the effluent. Based on the present operation conditions of the plant the factors influencing the activated sludge system were analyzed with suggesting the optimized operation parameters: the sludge recycle ratio of the secondary settling tank was decreased from original 0.75 to 0.20~0.25. The residual sludge discharge amount was decreased from original 591 m3/d to 204~249 m3/d, the reactor sludge concentration increased from original 1.2 g/L to 2.8 g/L. Therefore, the abilities of the system for resisting the loading impact and low temperature was enhanced and the effluent quality was improved.
On the basis of Biot theory, the basic equations on the hot fluid-solid coupling seepage are derived, and the mathematical model describing the thermal seepage is established. The dynamic dispersion distributing proba...
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On the basis of Biot theory, the basic equations on the hot fluid-solid coupling seepage are derived, and the mathematical model describing the thermal seepage is established. The dynamic dispersion distributing probability formula of the hot fluid and its coefficient expressions are presented. The displacement field of micro-pressure hot fluid is established, and the effect of the dynamic dispersion of the hot fluid on the boundary of porous media is discussed, and the equations for describing the dynamic boundary of porous media are established. In accordance with different outer factors, four boundary models and their dynamic simulations are presented.
Based on the microstructure-mechanisms of rock materials and a simple mechanical model, a rheology damage constitutive equation is proposed by introducing generalized time defined in the space of irreversible strain a...
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Based on the microstructure-mechanisms of rock materials and a simple mechanical model, a rheology damage constitutive equation is proposed by introducing generalized time defined in the space of irreversible strain and Newtonian time, and an anisotropic damage tensor of rank four. The anisotropic evolution and unilateral effect of damage as well as the effect of hydrostatic pressure' can be taken into account in the proposed model. The corresponding numerical analysis is developed;and the creep, inelastic and damage behaviors of claystone are analyzed. It shows that the calculated results agree well with the experimental observation. The influence of stress level on the creep can be well described with the model.
Based on the fundamental principle of rock mechanics, the stresses of single joint rock mass under three-dimensional compression were analyzed. The effect of the in-termediate principle stress on the strength of singl...
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Based on the fundamental principle of rock mechanics, the stresses of single joint rock mass under three-dimensional compression were analyzed. The effect of the in-termediate principle stress on the strength of single joint rock mass were discussed in par-ticular. It is found that the strength of single joint rock are affected by the intermediate principal stress, which may be the main factor in some conditions.
Based on the mechanical experiment of brittle coal-rock and the damage mechanical theory, a damage model was established. Coal-Rock damage mechanical characteristic was researched. Furthermore, interior energy transfo...
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Based on the mechanical experiment of brittle coal-rock and the damage mechanical theory, a damage model was established. Coal-Rock damage mechanical characteristic was researched. Furthermore, interior energy transformation mechanism of rock was analyzed from the point of view of damage mechanics and damage energy release rate of brittle coal rock was derived. By analyzing the energy transformation of rock burst, a new conception, damage energy index of rock burst, was put forward. The condition of rock burst was also established.
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