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2018 Vol. 3, No. 6

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Identification of roof and floor lithology of coal measures  strata based on double modes inversion method： a case of
Li Yuying, Liu Xiaoyan, Gu Jianying, Guo Jiacheng, Liu Zhongyuan, Fu Huiying
2018, 3(6): 515-520.
Abstract(699) PDF(317)
Abstract:
In order to improve the classification accuracy of No3 coal seam roof and floor lithology in Sihe mine，the research of wave impedance and gamma ray pseudo acoustic impedance inversion method of dual mode identifications of coal bearing strata lithology of roof and floor were carried out to analysis well logging response characteristics of No3 coal seam roof and floor lithologyThe qualitative analysis results were used to find out the classifications of two kinds of parameters of roof and floor lithology，wave impedance and gamma rayCombined with the data of No3 coal seam in Sihe mining area，wave impedance natural gamma cross plot were used to find out the range of wave impedance and gamma quantitativelyFinally，the roof and floor lithology of common coal seam by wave impedance and natural gamma acoustic impedance double mode inversion method could be classified accuratelyThe results show that compared with the conventional impedance inversion method，the wave impedance and natural gamma pseudo acoustic impedance dual mode inversion method can accurately classify the top and bottom slate of coal seam
 
Deep belief neural networkbased arrival picking for microseismic data
Zheng Jing, Cao Ziyuan, Jiang Tianqi, Shen Shuaishuai
2018, 3(6): 521-526.
Abstract(622) PDF(228)
Abstract:
In order to improve the picking accuracy of the weak signal in low signal to noise ratio，a pickup method based on STransform and deep belief neural network（DBN）was proposedThe network model training was divided into two stepsFirst，the original data processed by STransformation was subjected to unsupervised pretraining by using a restricted Boltzmann machine（RBM），and the initial values of the network model parameters were obtainedNetwork parameters adjusted by error backpropagation were used to build the final DBN modelThen，the trained network was used to pick up the dataCompared with pickup results of the STA/LTA method，the method we used has higher antinoise performance
Analysis of energy release in impact instability damage of briquette model
Wang Zhidong1, Li Liyun1, 2, Liu Yi1, Liu Bingquan1, Wei Mengxi1
2018, 3(6): 527-535.
Abstract(497) PDF(182)
Abstract:
A large number of energy can be released in coal bumpsIn order to quantitatively calculate energy released amount，the uniaxial compression singlepressure experiment of coal briquette model was carried out，and the ejection velocity of coal pillar in damage was measured by the highspeed photography to obtain energy release situation in failure of coal pillarIn addition，the amount of energy release is calculated by finite element method before and after destruction of the modelTaking into account a certain proportion of energy dissipation，the theoretical ejection velocity of coal pillar can be calculated by energy conservation principle，and the theoretical value is in good agreement with the measured valueFinally，this paper proves that the ejection velocity of coal fragments in failure measured from experiment is the same as the ejection velocity in failure from engineering practice
Study on energy concentration and dissipation of Beishan granite in Gansu during failure process
Wang Chaosheng, Zhou Hongwei, Pei Hao, Wang Zihui, Liu Jianfeng
2018, 3(6): 536-542.
Abstract(429) PDF(181)
Abstract:
Servo test system was used to obtain stressstrain curves of Beishan granite under different confining pressure，and the loading process was jointly controlled by means of axial pressure and circumferential deformationVariation characteristics of energy and characteristic stress of Beishan granite were researchedCharacteristic stress are linear increase with confining pressure increasing，crack initiation stress，damage stress and peak strength increased 330 MPa，674 MPa，768 MPa respectively along with confining pressure increased 1 MPaTotal energy and elastic energy corresponding to characteristic stress are greatly increase with confining pressure increasingWhen confining pressure increased form 2 MPa to 30 MPa，elastic energy corresponding to initiation stress，damage stress and peak stress increased 52 times，58 times and 51 times respectively，corresponding total energy increased 49 times，57 times and 47 times respectivelyThe increment of dissipation energy increase with increasing of confining pressure，and energy at the crack unstable propagation stage was significant affected by confining pressureEnergy storage coefficient was defined to estimate rock stability around the peak strength，effect of stress state coefficient on energy storage was further analyzed
 Study on deformation characteristics and support  optimization of weak surrounding rock in fault zone
Chen Hui1, 3, Jiang Yaodong2, Deng Daixin2, Shao Mingming2, Feng Jinmeng2
2018, 3(6): 543-552.
Abstract(567) PDF(179)
Abstract:
The study of deformation characteristics of weak surrounding rock around fault zone is of great significance for roadway support optimization and preventing large deformation of the surrounding rockBased on the engineering background of Chengjiao coal mine in Henan province，surface displacement，topplate deformation and loose ring of surrounding rock are monitored in the excavation process of the secondlevel westwing track roadwayThe stress of fault structure gradually decreases under the continuous influence of the excavation of roadways，and the deformation speed of the tunnel increases first and then decreases with the advance of the roadwayTherefore，the force caused tunnel deformation in fault zone mainly comes from fault tectonic stressThe deep surrounding rock is affected by fault structure，the crack is well developed，and the roof is unstable，the shallow surrounding rock has smaller abscission layer due to the excavation of the roadwayThe loose ring around the fault is greatly affected by fault structure and the roof forms a large loosen ringIn this paper，the support optimization scheme of Utype steel and anchorage cable is proposed according to the results of field monitoring and actual geological conditions
Study on directional hydraulic fracturing of prefabricated fissures in top coal
Lü Huayong1, Liu Fei1, Li Lianghui1, 2, Cheng Zhanbo3
2018, 3(6): 553-560.
Abstract(530) PDF(218)
Abstract:
In order to improve the cavity and working surface operating environment of thick hard top coal，the top coal prefabricated fissure hydraulic fracturing technology was proposedThe basic principle of directional fracturing was studied and the stress models of borehole and fissures were analyzed then the cracking conditions，the propagation process and its morphology of fissures were obtainedThe RFPA2D-Flow percolation software was used to study the directional fracturing of top coal：In the initial stage of fracturing，the high stress concentration occurs at the tip of the fissures，a relief zone forms in the borehole and the both side of directional fissure and it gradually increases with water injection pressureMeanwhile，the high water pressure zone forms around drilling and directional cracks and it gradually increases with water injection pressureIn the early stage of fissures，the shear failure occurred in the coal body，and a large number of tensile damage occurred in the later stage of fracturingWhen the orientation crack angle α is between 0°~60°，cracks appear and extend，then change directionWhen the inclination angle α is 75°and 90°，the fissures extends along the maximum horizontal principal stress direction
Stability analysis and parameter optimization on the rock mass  in Jiuzhanggou gold mine
Wang Bingwen1, Xu Peng1, Zhang Hao1, Xiong Tingyong1, Song Enxiang2, Zhang Yapeng2
2018, 3(6): 561-567.
Abstract(638) PDF(178)
Abstract:
In order to study the stability analysis method and parameter optimization for the upward drift stope，several indexes representing the engineering quality of rock mass in mines were acquired by the survey of engineering geology，digital photographic，the orebearing rock mechanics experiments etc in Jiuzhanggou gold mineThe 3D digital measurement system（ShapeMetrix3D） is employed to survey and collect the digital information of the plane parameters of rockmass structures that including rock mass occurrence，joint spacing，joint set numbers，volume density of structural plane for 100 m stope at Jiuzhanggou gold mineBased on the digital joint structure characteristics，the RMR system and Qsystem are employed to analyze and classify the stability of stope rockmass，incorperating with drilling peep results and rock mechanics parametersAccording to the acquired indexes，the current span of the testing stope is optimized by using the Mathews stability graph methodIt is concluded that the span of the stope should be strictly controlled below 75 m in order to ensure the stability of stope
Fuzzy logic control for coal mine underground mechanical moving jigger
Cao Wei1, 2, Shang Deyong1, Xiang Qinghuan2
2018, 3(6): 568-574.
Abstract(546) PDF(165)
Abstract:
The coal mine underground gangue discharge and gob filling technology is an effective way to realize green miningThe control system of mechanical moving sieve jig is the core equipment of the underground coal preparation system，and the performance is critical to improve the efficiency of separationAs the features of control system are nonlinear timevarying uncertainties and pure lag，the fuzzy logic control is designed for jig control system to fuzzy controlling speed of discharging motorIndustrial test was carried out in Tangshan coal mine，and three type of inputs were tested to obtain relationship between the amount of coal gangue in movable sieve and the motor frequencyThe experiment results showed that the fuzzy logic control was found to be more efficient for stabilizing the gangue layer than other control system，which could avoid the destruction of gangue layer structure and improve the efficiency of coal and gangue sorting，which can achieve the ideal effect of gangue discharge
  Research on cloud model of risk assessment of urban underground
diseases based on dynamic tracking and set pair theory
Research on cloud model of risk assessment of urban underground
diseases based on dynamic tracking and set pair theory
Xu Xinjun, Yang Feng
2018, 3(6): 575-586.
Abstract(460) PDF(134)
Abstract:
A cloud model for the risk assessment of urban underground diseases was proposed by integrating dynamic tracking theory and set pair analysis theoryFirstly，taking into account the dynamic development characteristics of diseases，a risk assessment method based on dynamic tracking thoughts was proposed by including the change rate of disease properties into risk assessment systemSecondly，assessment indicators were transformed into indicator clouds by inverse Gauss cloud algorithm based on the secondorder and fourthorder center distance，and the least squares method was used to combine and optimize the subjective cloud weight and objective critic weight to distribute weights for indicators scientificallyFinally，by introducing the set pair analysis theory，the “3En” rule of Gauss cloud model was combined with the set pair potential in set pair theory to calculate similarity of the cloud model and improve the accuracy of risk level discriminationThrough the underground disease detection project in Guiyang City and the East Fourth Ring of Beijing，the model proposed was compared with the other three assessment models and actual excavation results were used to verify the validity of the model
Variation characteristics of dissolved organic matter（DOM） in coaltoliquids wastewater during biological treatment process
Peng Siwei, Dai Ziyu
2018, 3(6): 587-595.
Abstract(489) PDF(107)
Abstract:
The anaerobic/aerobic（A/O） treatment process was an important process for linking pretreatment and deep treatment of coaltoliquids（CTL） wastewaterTherefore，in this study，the variation characteristic of DOM in A/O treatment process of CTL wastewater has been analyzed in deepThe purpose of this paper was to evaluate the treatment efficiency of A/O process，clarify the variation characteristics of DOM，select the characteristic pollutants after A/O treatment and provide theoretical basis and pertinent suggestions for subsequent deep treatmentWater samples were analyzed by GC/MS，resin fractionation，fluorescence spectroscopy and PARAFAC modelGC/MS experimental analysis revealed that A/O process could partially remove DOM in CTL wastewaterThe DOM fractionation results showed that wastewater were mainly hydrophobic substances before and after A/O treatment，but the compositions changedThe fluorescence spectrum analysis results showed that the A/O process could effectively remove organics with fluorescence response in humic acid and fulvic acid region in DOMOn the other hand，EEM conjunction with PARAFAC model could precisely monitor organic pollutants evolutionsIn summary，the A/O process could effectively remove the DOM from the coaltoliquid wastewater，and the removal of phenol and esters should be strengthened in the subsequent deep treatment
  Preparation of anthracitebased CO2 adsorbents and electrode materials
Feng Ping, Zhao Jian, Xu Hongxiang, Huang Bo
2018, 3(6): 596-603.
Abstract(507) PDF(212)
Abstract:
In this paper，coalbased porous carbon material with different specific surface area and pore size distribution was obtained by adjusting the proportion of KOH to coal based on Taixi anthraciteWhen the ratio of KOH to coal is 5∶1 at the temperature of 800 ℃ for activation of 2 h，the obtained material has the highest specific surface area and pore volume（3 275 m2/g，162 cm3/g）The adsorption amount of carbon dioxide at 0 ℃ and 100 kPa was 2371 %The material is doped with nitrogen by using urea as a nitrogen sourceCompound material was prepared through oxidationreduction reaction on the carbon material loaded with manganese，which is used for a negative electrode material of a lithium ion batteryIt exhibits good stability in chargedischarge cyclesThe nitrogen and manganese dioxide are helpful to improve the specific capacitance of the material
Removal of PFOA and PFOS from water by titanium supported nano silver electrode
Su Changluo, Li Zheng, Wang Kai, Zhang Chunhui
2018, 3(6): 604-609.
Abstract(524) PDF(196)
Abstract:
In order to solve the problem that Perfluorooctanoic Acid（PFOA） and Perfluorooctane Sulfonate（PFOS） in the perfluorinated and polyfluoroalkyl substances（PFASs） are difficult to be naturally degraded and impossible effectively removed by traditional methods，this research is aim to using electrochemical method to the treatment of perfluorinated compoundsTitanium supporting nanosilver plates were prepared by electrodeposition methods，and the effects of plate materials，reaction time，pH，current density and other factors on the removal of PFOA and PFOS were explored respectivelyResults demonstrate that the corrosion potential of titanium plate increases by 0.2 V and the corrosion resistance increases remarkably after load silver on the surface of titaniumThe removal rates of PFOA and PFOS are 92.7% and 94% respectively at the same experimental condition of pH 7，reaction time of 60min and current density of 25 mA/cm2

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