State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam

Chongqing, China

State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam

Chongqing, China
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He B.,Chongqing University | He B.,State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam
Applied Mechanics and Materials | Year: 2014

Based on continuum damage mechanics, by defining the initial and critical damage value, because of the plastic volumetric strain of the specimen, we established the calculation methods of the rock specimen’s damage value. Through the conventional triaxial compression test of the shale, we find that damage value D changes as axial strain changes during compression, and summarizes its variation. © (2014) Trans Tech Publications, Switzerland.


Yin G.-Z.,Chongqing University | Yin G.-Z.,State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam | Li M.-H.,Chongqing University | Li W.-P.,Chongqing University | And 4 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

Based on domestic-developed triaxial servo-controlled seepage equipment for thermal-hydrological-mechanical coupling of coal containing methane, the experimental study of unloading confining pressure of coal was performed on coal samples under different gas pressure. The results show that the characteristic of distinct dilatancy is displayed in the process of unloading confining pressure, therefore seepage channels in coal body are extended and seepage velocity increases. The deformation of coal containing methane per unit decreased confining pressure and seepage velocity increases with the increase in gas pressure in the same stress paths. The compressive strength decreases gradually with the increase of gas pressure. In the initial stage of unloading confining pressure, deformation modulus of coal containing methane changes little. After the yielding occurs, it decreases obviously. The deformation modulus decreases 3.71%-7.45% in the process of unloading confining pressure. Meanwhile, the Poisson's ratio turns to increase and a function can be used to describe the relationship between confining pressure and Poisson's ratio.


Li D.,Chongqing University | Li D.,The Key Laboratory of the Exploitation of SW Resources | Li D.,State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam
Research Journal of Biotechnology | Year: 2010

The effect of citric catalysis on the microbiological leaching of chalcopyrite fine grained tailings using Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans in shake flask under mesophilic cnditions (30±1 °C) was studied. The test results suggested that citric catalysis and suitable pulp density could extract Cu remarkably better than in absence of catalyst. Once the tolerance is exceeded, the microbial activity would be inhibited. The citric catalyzed the bacteria to accelerate the leaching bioreaction of microbiological leaching but also extracted the Cu (II) directly as a organic acid. Scanning electron microscopy (SEM) was used to study microscopic changes occurring in chalcopyrite fine grained tailings when the microbiologica leaching medium contained citric catalysis.


Lu Y.-Y.,State Key Laboratory of Coal Mine Disaster Dynamics and Control | Lu Y.-Y.,State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam | Zhang S.,Chongqing Songzao C and E Co. | Liu Y.,State Key Laboratory of Coal Mine Disaster Dynamics and Control | And 5 more authors.
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2012

A mathematical model of rock breaking under pulsed jet is established by introducing the Johnson-Holmquist-Concrete constitutive relation and the smoothed particle hydrodynamics method. Based on this model, the formation, propagation and attenuation of stress wave during rock breaking by pulsed jet are simulated. The relations between pressure and time at different points on rock surface and the curve of peak stress wave versus distance to action spot are obtained. Destruction behaviors of rock under pulsed jet and effects on stress wave effect from jet velocity and lithology are studied according to the above calculation results, analysis results show that stress wave effect of pulsed jet acts locally and the peak stress wave shrinks sharply as the acting distance increases. The rock breaking mechanism of stress wave is tensile failure during the high speed process of load-unload. Power and effect range of stress wave is in high direct proportion with jet velocity. There is a threshold velocity before the macroscopic failure. Rocks of different lithologies have different destruction types under pulsed stress wave of pulsed jet. Destruction type of low strength rock like sandstone is crack propagation under the tensile stress during the high speed process of load-unload, while the destruction type of high strength brittle rocks like granite and limestone is vertical failure of stress concentration.


Jiao B.-Q.,Chongqing University | Li D.,State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam
Advanced Materials Research | Year: 2011

The influence of HRT , oxidic time and anoxidic time on the carbon and nitrogen removal of integrated oxidation ditch with continuous flow and intermittent aeration was studied by cross experiment method. The results show that the anoxidic time has the most distinct influence on removal ratio of BOD5 and TN in the system and the oxidic time has a distinct influence on BOD5 as well .When HRT , oxidic time and anoxidic time of the system is 8h , 2 h and 2 h respectively , the effluent quality and the removal ratio for BOD5 are <20 mg/ l and 85. 2 % and for TN are < 20 mg/ l and 55. 5 % respectively.


Guohong S.,Chongqing University | Dongwei L.,Chongqing University | Dongwei L.,State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam
Disaster Advances | Year: 2010

In this paper, "RS", "GIS" and "GPS" are integrated as the "3S" technology, which is widely applied to the construction of the dynamic monitoring system of soil erosion. This system is used to monitor the soil erosion in watershed and to pre-warn possible problems hidden in the process of land cultivation so that measures can be taken to prevent or solve such problems. At the same time, through the application of Chongqing dynamic monitoring system to soil erosion, functions and advantages of the system are explicitly presented.


Zhonghui X.U.,Chongqing University | Zhonghui X.U.,Southwest University of Science and Technology | Peng X.I.,Chongqing University | Dongwei L.I.,Chongqing University | And 2 more authors.
Disaster Advances | Year: 2010

Ancient pyrometallurgical zinc generated large amounts of slag. Natural leaching from ancient pyrometallurgical zinc sites has contaminated the soil closed to the deposits. Electrokinetic removal was used to treat this slag. In this study, in order to evaluate the migration of heavy metals in electrokinetic removal, Visual minteq was adopted to calculate the species distribution of heavy metals in different pH. When pH is between 9.0 and 11.0, Zn(OH)2 is the main species. Cd(OH)2 is the main species when pH is between 9.0 and 13.0. Hydroxide precipitation of zinc and cadmium was the main reason to restrict their migration. Arsenate always exist as an oxyanion such as AsO 4 3- , H2AsO4 HAsO4 2. Copper exists as anion form above pH 8. The enrichment of arsenic and copper near the anode occurred. Hiis is probably due to the electromigration of negatively charged arsenic and copper ions towards the anode which would be faster than electroosmotic flow in the opposite direction. In a word, because of the heavy metal's enrichment in sample sections, the final removal efficiency rate of heavy was low. Some enhanced technology must be adopted to improve the removal efficiency rate.


Li D.,Chongqing University | Li D.,Key Laboratory of the Exploitation of SW Resources and the Environmental Hazards Control Engineering | Li D.,State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam | Liang Z.,Chongqing University | Zhang S.,Chongqing University
Disaster Advances | Year: 2010

Chalcopyrite mineral processing solid waste(CMPSW), produced from processing and extraction of chalcopyrite, not only leads to land occupation, but also contaminates local water, air and soil. Therefore, CMPSW by Thiobacillus ferrooxidans and thiobacillus thiooxidans is considered. The interactions between microorganism, CMPSW particles, catalysts and bioleaching products were studied. It is demonstrated that the microorganism growth and the heavy metals leaching efficiency involves biological and chemical interactions. Hie tests results suggested that the Tt was best to bioleached the CMPSW, and the Tf was not as good as Tt. The leaching effect of mixed bacterias of Tt and Tf fell in between, the leaching rate would decrease when the pulp density increased. The micro-morphology of bacteria was observed by SEM, the single cellular dimension of bioleaching bactreia was about (1-2) μm × (0.2-0.5) μm.


Liu J.,Key Laboratory of the Exploitation of SW Resources and the Environmental Hazards Control Engineering | Li D.,Key Laboratory of the Exploitation of SW Resources and the Environmental Hazards Control Engineering | Li D.,State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam | Chen G.,Key Laboratory of the Exploitation of SW Resources and the Environmental Hazards Control Engineering
Disaster Advances | Year: 2010

The present research takes pyrite smelter slag as the research object. Through sampling collection and experimental analysis on the waste residue and the surrounding soil, the environmental hazards of the waste residue has been investigated so as to identify the property of the waste residue. Firstly, the research identified the complex composition of the waste residue and ultimately determined the pollution factor of heavy metals through XRF scanning. By using the total amount analysis of soil sample, the content of Zinc, Copper, and Lead metal was high with strong toxicity. On the other hand, it revealed that the waste residue still has certain values of re-use. By comparing heavy metal amount in soil with soil quality standard, the arsenic content in each site has exceeded the standard. Hie Copper, Zinc and Nickel also were over the standard limit, and the waste residue has certain influence on the surrounding environment. In the experiment of leaching toxicity analysis, it is indicated that the heavy metal value of the waste residue was very low, thiobacillus ferrooxidans were sort out from the water sample in the experiment. The pyrite smelter slag does not belong to hazardous wastes, further determined that the waste residue belongs to Class II General Industrial Solid Waste. However, the waste residue brings about pollution to local environment, and poses much potential safety hazards to downstream residents, farmlands and livestock, food security and drinking water. Hierefore, effective protection measures should be taken to these potential risks.


Li D.,Chongqing University | Li D.-W.,Chongqing University | Li D.-W.,Key Laboratory of the Exploitation of SW Resources and the Environmental Hazards Control Engineering | Li D.-W.,State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam
Advanced Materials Research | Year: 2011

The cyclohexanone production wastewater includes hazardous material such as cyclohexanone and cyclohexane which can harm the vessel of human body resulting in coagulation necrosis of viscera and brain. Our experiment choosed the cyclohexanone production wastewater to be investigated, and used the self-made anaerobic upflow bed filter (UBF) to deal with it. We try to find the optimal operational parameters which can make the degradation of hazardous materials maximizing. The COD removal efficiency was decreasing with the COD of influent's increasing in starting stage, the shock load made the microbe in UBF can't adapt the high VLR temporarily. In the running stage, the anaerobic sludge in UBF was incompact and the settleability of sludge was not very well. As the UBF running, the granular sludge shaped up greatly, the COD removal efficiency kept on 80%. The result showed that the UBF reactor was valid for hazardous material in cyclohexanone production wastewater.

Loading State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam collaborators
Loading State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam collaborators