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Energy Engineering 2021年第3期118卷 605-614页

作者： Jianguo Zhang Biao Hu Xiyuan Li Hongxing Zhou Zhixu Dai Yanlei Lu Deyang Wang State Key Laboratory of Coking coal Exploitation and Comprehensive Utilization China Pingmei Shenma GroupPingdingshan467009China Laboratory of Gas and Fire Control for coal Mines(China University of Mining and Technology) Ministry of EducationXuzhou221116China pingdingshan Tian’an coal Mining Co. Ltd.Pingdingshan467000China

To accurately predict the risk of coal and gas outburst and evaluate the reliability of desorption indexes of drilling cuttings(K_(1) andΔh_(2))in No.16 coal seam of Pingmei No.12 coal mine,two sets of coal samples were selected from the target coal seams for proximate analyses,methane adsorption/desorption tests,and desorption indexes of drilling cuttings *** results indicated that the desorption volume in the initial stage of desorption is large,and increases slowly in the later *** methane desorption volume of PMD1 and PMD2 coal samples accounts for 15.14%-18.09%and 15.72%-18.17%respectively in the first 1 min,and 43.92%-48.55%and 41.87%-52.25%respectively in the first 10 min in the 120 min desorption *** K_(1) andΔh_(2) present power function relationships with methane ***,the power function relationships also can be found between the initial desorption characteristics(Q1 and Q4-5)and the methane ***,the average relative error between the measured value and the calculated value of Q1 based on K_(1) is less than that of Q4-5 based onΔh_(2),which indicates that K_(1) is a more reliable index thanΔh_(2) to predict the risk of coal and gas outburst in the No.16 coal seam of Pingmei No.12 coal mine.

关键词： coal and gas outburst methane desorption desorption indexes of drilling cuttings

Study on mechanism and practice of surrounding rock control of high stress coal roadway

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Journal of coal Science & Engineering(China) 2006年第2期12卷 6-10页

作者：王卫军杨磊欧阳广斌 Department of Energy and Safety Hunan University of Science and TechnologyXiangtan 411201China No.4 coal Mine Pingdingshan Mining Group CompanyPingdingshan 467000China

The mechanical principle and surrounding rock deformation feature of highstress coal roadway was *** condition of stress balance of the kind of theroadway was put *** surrounding rock control principle and supporting techniqueof high stress coal roadway were *** was very important to control early daysdeformation of coal *** supporting strength is should increased,so the strengthloss of coal sides is *** range of plastic fluid zone is *** abovemention-ned principle is applied in industrial test,and the new supporting technique is ap-plied successfully.

关键词： high stress coal roadway surrounding rock control

Strata movement and stress evolution when mining two overlapping panels affected by hard stratum

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International Journal of Mining Science and Technology 2019年第5期29卷 691-699页

作者： Jianguo Zhang Wei Yang Baiquan Lin Jinjing Zhang Man Wang State Key Laboratory of Coking coal Exploitation and Comprehensive Utilization China Pingmei Shenma GroupPingdingshan 467000China Key Laboratory of Gas and Fire Control for coal Mines(China University of Mining and Technology) Ministry of EducationXuzhou 221116China China Pingmei Shenma group Pingdingshan 467000China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China

Mining causes stress redistribution and stratum *** this paper,a numerical model was built according to the geological conditions in the 12th coal mine in pingdingshan city to study the strata movement and the evolution of stress when mining two overlapping longwall panels,named panels#14 and#*** strata close to the mined panel move directly towards the gob,while the strata that are farther away swing back and forth during the mining *** directed movement and swinging can break the transverse boreholes for gas extraction;a surface borehole should not be within the range of directional *** stress evolution suggested that the mining of the lower panel#15 after the upper panel#14 would further increase the de-stressed range,while the stress concentration around the mined panel would be *** strata usually carry a greater stress than adjacent rocks and soft coal *** stress in a hard stratum increases greatly,and the stress decreases greatly in the coal seams below the hard *** study supplies a reference for similar coal mines and is useful for determining the de-stressed range and transverse borehole arrangement for gas extraction.

关键词： Stratum movement Mining Longwall panel Hard stratum

SYNERGETICS ANALYSIS OF ROCK MASS BASED ON ITS CHARACTERISTIC OF DISCONTINUATION

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地球与环境 2005年第B10期33卷 130-132页

作者： PAN Yong-zhan YU Guang-ming WANG Xiao-dong Henan University of Science and Technology Luoyang 471003 China Qingdao Technological University Qingdao 266033 China pingdingshan coal group Pingdingshan 467012 China

Based on the noncontinuity of rock mass, views it as a system made of blocks that are divided by dissconti-nuties. Take the relative displacement of blocks as order parameter and establish its main equation using the micro-cosmic disposal method of synergetics. Then solve this equation and get its solution of nonstationary state. Narrate the characteristic of change and interrelated factors of blocks' displacement through the analysis of nonstationary state of main equation.

关键词：岩石力学性质协同作用稳定性受力方程

Deep original information preservation by applying in-situ film formation technology during coring

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Petroleum Science 2022年第3期19卷 1322-1333页

作者： Liang-Yu Zhu Tao Liu Zhi-Yu Zhao Yi-Fan Wu Dong-Sheng Yang Xiang-Chao Shi Zhi-Qiang Liu Fei-Fei Lu Pei Qin Xiao-Liang Gao State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu610065SichuanChina College of Polymer Science and Engineering Sichuan UniversityChengdu610065China Zaoshenzhuang Village Hancheng TowuLubei DistrictTangshan064002HebeiChina Xi'an Research Institute China Coal Technology&Engineering Group CorpXi'an710077China State Key Laboratory of Coking coal Exploitation and Comprehensive Utilization Pingdingshan467000China Institute of coal Mining and Utilization Pingdingshan Tianan Coal Mining Co.LTD.Pingdingshan467000China

Accurately obtaining the original information of an in-situ rock via coring is a significant guiding step for exploring and developing deep oil and gas *** is difficult for traditional coring technology and equipment to preserve the original information in deep *** study develops a technology for insitu substance-preserved(ISP),moisture-preserved(IMP),and light-preserved(ILP)*** technology stores the original information in real time by forming a solid sealing film on the in-situ sample during *** study designed the ISP-IMP-ILP-Coring process and *** addition,an ISP-IMP-ILPCoring process simulation system was *** effects of temperature,pressure,and film thickness on the quality of the in-situ film were investigated by performing in-situ film-forming simulation experiments.A solid sealing film with a thickness of 2-3 mm can be formed;it completely covers the core sample and has uniform *** film maintains good ISP-IMP-ILP properties and can protect the core sample in the in-situ environment *** study verifies the feasibility of“film formation during coring”technology and provides strong support for the engineering application of ISP-IMP-ILPCoring technology.

关键词： Deep resource exploitation Original information ISP-IMP-ILP-Coring Solid sealing film In-situ film-forming Film formation during coring

Development and Tests of ZW-126/D2000-40 Vacuum Circuit Breakers with Controlled Switching Technology

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CSEE Journal of Power and Energy Systems 2022年第1期8卷 249-257页

作者： Yu Tian Jiayuan Xu Yuan Deng Yongxing Wang Enyuan Dong Jiyan Zou Dalian University of Technology Dalian 116024China State Grid Pinggao group Pingdingshan 467001China

A ZW-126/D2000-40 type single-break vacuum circuit breaker(VCB)with controlled switching technology is designed and produced in this *** results of type tests based on IEC and GB standards are presented.A 126 kV singlebreak vacuum interrupter(VI)with 3/4 coil axial magnetic field(AMF)contacts is used in the VCB,which can interrupt short currents of 40 *** external insulation of the VI is provided by SF_(6) at 0.1 *** order to match the 126 kV single-break VI and controlled switching device,a long-stroke electro-magnetic force actuator(EMFA)with 16 kN closing holding force and 3.5 m/s average opening speed is ***,a position tracking controlled switching device based on closed-loop control using the technology of a fuzzy control algorithm and pulse width modulation is applied to the controlled switching *** device is applied to control the coil current of EMFA and the electromagnetic force,so as to control the EMFA to follow the ideal position *** type tests of 126 kV VCB are all passed according to the IEC62271-100 and GB1984-2014,including dielectric tests,basic short-circuit tests,shortline fault tests,out-of-phase tests,*** strong capacitive current breaking capacity and mechanical strength of the VCB are proved by the capacitive current switching test of class C2,electrical endurance test of class E2 and mechanical endurance test of class *** electromagnetic compatibility(EMC)tests are passed according to the *** controlled switching test of capacitive current was successful according to IEC62271-302 and GB/T30846-2014,and the controlled switching accuracy is less than±0.5 *** test results show that the VCB has excellent performance,which has broad application prospects in special occasions at a 126 kV voltage level,such as a switching capacitor and no-load transformer,etc.

关键词： Controlled switching electro-magnetic force actuator(EMFA) single-break type test vacuum circuit breaker(VCB)

Relevance between abutment pressure and fractal dimension of crack network induced by mining

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International Journal of Mining Science and Technology 2013年第6期23卷 925-930页

作者： Gao Mingzhong Jin Wencheng Dai Zhixu Xie Jing State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan University College of Hydraulic and Hydropower Engineering Sichuan University Energy&Chemical Industry Research Institute Shenma Group of Pingdingshan Coal Group College of Architecture and Environment Sichuan University

Based on the geological conditions of coal mining face No.15-14120 at No.8 mine of pingdingshan coal mining group,the real-time evolution of coal-roof crack network with working face advancing was collected with the help of intrinsically safe borehole video *** according to the geology of this working face,a discrete element model was calculated by *** in situ experimental data with numerical results,the relationship between the fractal dimension of boreholes'wall and the distribution of advanced abutment pressure was studied under the condition of mining *** results show that the variation tendency of fractal dimension and the abutment pressure has the same characteristic *** distance between working face and the peak value of the abutment pressure has a slight increasing trend with the advancing of *** the working face is set as the original point,the trend of fractal dimension from the far place to the origin can be divided into three phases:constant,steady increasing and *** the turning points of these phases are the max-influencing distance(50 m)and peak value(15 m)of abutment pressure.

关键词： Boreholes coal mines Cracks Finite difference method Fractal dimension

Study on non-uniformity and dynamic fracture characteristics of GIL tri-post insulators considering Al_(2)O_(3) sedimentation

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High Voltage 2023年第4期8卷 659-667页

作者： Jin Li Songtao Liu Hucheng Liang Liucheng Hao Yaxiang Wang Boxue Du School of Electrical and Information Engineering Tianjin UniversityTianjinChina Pinggao group Co. Ltd.PingdingshanChina

Tri-post insulators in gas-insulated transmission line(GIL)are usually fabricated with high mass fraction of micron aluminum oxide(Al_(2)O_(3)),which will unavoidably settle under the action of gravity during the preparation process and seriously affect the uniformity.A model of filler sedimentation in epoxy resin composite materials was proposed based on the particle size analysis and Stokes'*** scaled tri-post insulators were prepared and tested by *** is determined that the position of density concentration is the lower side of the two lower posts and the upper interface between the insulator and the *** density ranges from 2.144 to 2.346 g/cm^(3).The dynamic fracture simulation model of insulator was established and it is found that the insulator fracture occurs at the interface of upper post/insert under radial load,which is verified by *** comparing the influence of sprue position on the density distribution,it is found that the uniformity of insulators is increased by 13.7% by forward pouring compared with reverse *** research develops an accurate method for simulating the filler sedimentation and the fracture process in epoxy-based insulators,which is helpful for the improvement of mechanical reliability of GIL.

关键词： fracture insulator dynamic

Traditional Chinese medicine manipulative reduction combined with percutaneous vertebroplasty for treating type Ⅲ Kummell's disease: A case report

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World Journal of Clinical Cases 2022年第21期10卷 7531-7538页

作者： Shen-Shen Hao Rui-Jun Zhang Sheng-Li Dong Hong-Ke Li Shuai Liu Rui-Fang Li Hui-Hui Ren Li-Yan Zhang Department of Spine and Bone Oncology General Hospital of Pingmei Shenma Medical GroupPingdingshan 467000Henan ProvinceChina Department of Medical General Hospital of Pingmei Shenma Medical GroupPingdingshan 467000Henan ProvinceChina

BACKGROUND A patient with type Ⅲ Kummell’s disease had a ruptured posterior cortex of the fractured vertebral body, which caused spinal cord compression. An open surgery was considered the best choice of operation. However, the patient and her family refused open surgery and instead demanded a minimally invasive surgical treatment such as percutaneous vertebroplasty(PVP). After preoperative discussion, we finally adopted the novel therapy of traditional Chinese medicine manipulative reduction(TCMMR) combined with *** SUMMARY A patient with type Ⅲ Kummell’s disease exhibiting bone block-induced spinal cord compression was admitted to our hospital. She suffered from a variety of medical disorders but refused open surgery, and instead asked for PVP surgery. TCMMR, in parallel with PVP, was used to restore the height of the compressed vertebral body and reduce the symptoms of spinal cord compression by the bone block in order to strengthen the vertebral body and prevent further collapse. The surgery was very successful. The height of the compressed vertebra was restored, and the symptom of spinal cord compression by bone block was reduced successfully via TCMMR. The fractured vertebra was solidified by the PVP. The pain visual analog score declined from preoperative 7 scores to postoperative 2 scores, and the Frankel spinal cord scale increased from preoperative D degree to postoperative E *** The new method has advantages in treating patients with type Ⅲ Kummell’s disease who cannot be treated with open surgery.

关键词： Type III Kummell's disease Spinal cord compression by bone block Traditional Chinese medicine manipulative reduction Percutaneous vertebroplasty Case report

coal Seam Permeability Improvement and CBM Production Enhancement by Enlarged Borehole: Mechanism and Application

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Energy Engineering 2021年第6期118卷 1811-1825页

作者： Xiyuan Li Peng Chu Zhuang Lu Yuanyuan Liu Zibin Zhu Jin Gao Xiaoxue Liao Tao Yang China Pingmei Shenma group State Key Laboratory Coking Coal Exploitat&ComprehensPingdingshan467000China Key Laboratory of coal Methane and Fire Control Ministry of EducationChina University of Mining&TechnologyXuzhou221116China National Engineering Research Center for coal Gas Control China University of Mining&TechnologyXuzhou221116China

The permeability is a key factor to determine the efficiency of coalbed methane(CBM)*** borehole enlargement technology using hydraulic and mechanical measures to cut coal is an effective method to increase the coal seam permeability and improve the efficiency of gas *** design of the layout of boreholes is the prerequisite for efficient and economical gas *** this paper,based on the strain-softening model,the stress and permeability model of the coal seam around the enlarged borehole was built,and based on the dual-medium model,the gas migration model in the coal seam was *** the borehole enlargement gas drainage engineering of E9/10 coal seam in pingdingshan No.8 coal mine was simulated by using COMSOL Multiphysics *** distribution of stress and permeability in the coal seam around a borehole was analyzed,and the reasonable borehole radius of 0.25 m and reasonable borehole spacing of 6 m were ***,in pingdingshan No.8 coal mine,field application was carried out in E9/10 coal seam-21070 working face from the high-level gas drainage *** results show that the actual average coal slag discharge rate is 77.82%,which achieved borehole *** natural gas flow rate from an enlarged borehole is 2.3–7.3 times that of a normal borehole,and the influence range of enlarged boreholes is more than 6 *** average gas drainage concentration of a group of enlarged boreholes is about 42%,and the average gas drainage amount is about 0.53 m3/*** two months of gas extraction,the outburst risk in this area was eliminated,which provides a guarantee for safe coal mining.

关键词： CBM production gas extraction enlarged borehole permeability improvement numerical simulation field application