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Chuai X.-Y.,Jizhong Energy Group Co. | Chuai X.-Y.,CAS Institute of Geology and Geophysics | Teng J.-W.,CAS Institute of Geology and Geophysics
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2017

North China type coalfield karstic collapse column water inrush is the most serious potential issue for coalmine production safety, as the water inrush quantity is significantly huge and destructive. However, research on karstic collapse column water inrush mechanism, water inrush process and mechanical model of water inrush is still in its infancy. In this paper, based on heterogeneity assumption of the collapse column overburden layer and shear failure theory, we established a water inrush mechanical model of strong conducting (water including) karstic collapse column of different cross section types. Besides, the critical condition of strong conducting (water including) karstic collapse column water inrush, which is caused by Ordovician confined water stress and mining stress during mining process, was established. Meanwhile, the water inrush risk coefficient is proposed and utilized to evaluate the karstic collapse column stability of water inrush resistance. Theoretical derivations and numerical analysis indicate that strong conducting (water including) karstic collapse column water inrush is a complex processes related with the column cross section shape, critical thickness of water-resisting layer, and rock physical properties. The work in this paper indicates that column section shape is the key for water inrush under the same mining environment, and the circle section column is the most vulnerable section shape of column to water inrush. © 2017, Science Press. All right reserved.


BEIJING, Feb. 17, 2017 /PRNewswire/ -- China Energy Company Limited (CEFC China) is ranked 34th among the Fortune Global 500's energy industry list. Among the top ten Chinese energy companies who enter the Global 500, CEFC China is the only private company. On the list of 2016 Fortune Global 500, there are 77 companies worldwide that deal in oil, coal, natural gas, electricity and electrical power, 24 of which are Chinese companies. CEFC China is ranked 8th among China's top ten energy companies. Other names in the top ten include State Grid Corporation of China, China National Petroleum Corporation, China Petrochemical Corporation, China Southern Power Grid Co., Ltd., China National Offshore Oil Corporation, The Power Construction Corporation of China, China Huaneng Group, Jizhong Energy Group Co., Ltd and the Shenhua Group Corporation Ltd. Compared with 2015, the ranking of CEFC China jumped 113 positions to reach 229th in the Fortune Global 500, with a business revenue of USD 41.845 billion. In 2016 CEFC China completed the transaction of controlling stock of Kazakhstan national petroleum international corporation, thus reinforcing control over oil terminals in a dozen countries in the Black Sea and Mediterranean region. CEFC China gained four percent of equities in the biggest developed oil gas field in Abu Dhabi. The relevant agreement will be signed soon. Adding CEFC China's sales equity for 10 million tons of oil and gas from Abu Dhabi, CEFC China will be able to increase imports by over 13.2 million tons of crude oil to China each year. The company has succeeded in entering the upstream of West Africa's oil gas industry by completing stock transactions in Chad oil gas project. CEFC China has built in China oil reserve bases with a capacity of over three million cubic meters. The reserve bases have been put into operation and provide strategic oil reserves for China State Reserve Bureau. This project by CEFC China will increase reserves by three days for the whole country. At the end of 2016, the China-Kazakhstan liquefied petroleum gas railway transportation, which was funded by CEFC China, was completed. This project greatly strengthened oil gas import capabilities for China's northwestern region. With the launching and pushing forward of such key projects, CEFC China is completing its international energy strategy. CEFC China will achieve greater goals in oil and gas industry in 2017. To view the original version on PR Newswire, visit:http://www.prnewswire.com/news-releases/cefc-china-ranks-34th-among-world-energy-companies-only-private-company-in-chinas-top-ten-energy-companies-300409427.html


Jiang Y.,China University of Mining and Technology | Lu Y.,China University of Mining and Technology | Zhao Y.,China University of Mining and Technology | Zhang D.,Jizhong Energy Group Co.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2011

The occurrences of breakage and water inrush disasters of working face floor under mining above aquifer are increasing with the mining depth in China. Taking the working face floor above deep aquifer in Jiulong Mine as the research object, by means of the core extraction, drill core logging and laboratory testing, the distribution laws of aquifers and mechanical parameters of each rock stratum of the working face floor above aquifer are obtained. Meanwhile, the reliability of parameters are ensured. The similar simulation test for fracture instability characteristics of working face roof and floor during the mining above aquifer are carried out by the self-designed confined water simulation equipment. And the stress variation laws of the roof and floor during working face mining are obtained. Using the noncontact optical measurement technology, the whole field displacement contours are measured. Base on the 'down three zones' theory, the maximum failure depth of working face floor, the raise height of confined water and the thickness of effective confining rock strata in deep region of Jiulong Mine are calculated. The simulation results show that: the 'three zones' appear in deep working face floor above aquifer in Jiulong Mine; and the new confined water simulation equipment can simulate the process of water pressure relief.


Feng G.-M.,China University of Mining and Technology | Sun C.-D.,China University of Mining and Technology | Sun C.-D.,Jizhong Energy Group Co. | Wang C.-Z.,China University of Mining and Technology | Zhou Z.,China University of Mining and Technology
Meitan Xuebao/Journal of the China Coal Society | Year: 2010

Based on the basic properties of super high-water material, the technology of goaf filling mining with super high-water material was studied out in order to liberate the coal resources under buildings. There are four types in the technology, including open filling, bag filling, hybrid filling and partition filling. Every type was analyzed detailedly, containing its filling process, advantages, disadvantages and applicable conditions. The results show that super high-water material is an ideal goaf filling material in a wet, cold and closed environment, and the material with its corresponding fill mining methods is one of the development directions of future goaf filling mining technologies.


Wang G.,Hebei University of Engineering | Jiao S.,Hebei University of Engineering | Cheng G.,Jizhong Energy Group Co.
Energy Exploration and Exploitation | Year: 2011

In view of the present situations and existing problems of thin coal seam mining under complex geological conditions, low-profile mining equipment for fully mechanized coal mining was developed. This paper presents the study on the development of the equipment. The low-profile mining machinery includes the shearer, the scraper conveyer, the hydraulic powered supports and others. A highly efficient cutting system with a high-power mechanical drive was utilized to improve the rock breaking capacity. The ultrahigh-temperature laser cladding technology was applied in the cutting equipment for wear-resisting sparkless coal and rocks excavating, suitable for highly gassy mines. The lead-angle friction theory and the side-pushing principle of angled panel forward movement were applied in the development of the moldboard coalloading equipment. This development successfully achieved a coal-loading rate of over 98% and ensured smooth movement of the scrapper. Automation was implemented with electro-hydraulic technology and shearer remote control technology in main coal mining operations such as the movement of hydraulic support and conveyor. The automation enabled fast mining operations following the rapid movement of the cutting machinery. Furthermore, advanced computer simulations and optimizations were conducted to achieve optimal structural designs of the hydraulic powered supports. With the above development of low-profile mining equipment, fully mechanized mining of thin coal seams under the complex geological conditions was achieved. The development equipment has great potential to be widely applied in coal mines with similar conditions.


Zhao Q.-B.,Jizhong Energy Group Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2014

Based on large mining deep mine deep coal seam and under-group coal seam mining influenced by ordovician limestone confined water threat situation and water keeping requirement in Hanxing mining area, regional advanced governance idea of ordovician limestone karst water with pressure mining water disaster governance and advanced initiative, regional governance, wholly transformation, mining with pressure guideline were put forward; Regional partition principle, management mode and suitable conditions, investigation and governance combined with new methods, advanced governance management procedures, floor block water proof capacity evaluation method and key technology governance and other supportive system were correspondingly gave. The whole set technology was put into study and application in Hanxing mining area, especially the ground multi-branch horizontal drilling key technology application research, which got excellent safe technology effect, innovated ordovician limestone karst water disaster governance in deep mining mines and under-group coal seam mining, mined out the coal resourced safely threatened by confined water and protected coal system basement ordovician limestone karst water environment.


Liu J.-G.,Jizhong Energy Group Co. | Zhao Q.-B.,Jizhong Energy Group Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2010

In order to eliminate coal waste dump and reduce the impact on the surrounding environment, combined with a lot of pressure under the building safety coal mining, three types of filling coal mining test were carried out. Through the experimental studies of different filling dielectric material, basic mastered reasonable ratio of filling materials, the mechanical behavior of various filling materials'compactness, rheological, weathering characteristic, and so on; researched and developed mining and filling integrated hydraulic support, filling and compaction equipment and the sealing mechanism of mining, filling isolation with the core technology and equipment of independent intellectual property; overcame the puzzle of prevent plugging and impact buffer blowdown with large vertical deep and input in the solid transportation system, developed the ratio of filling materials, the system of quality intelligent automatic control; optimized the parameters of filling technology and system package of equipment.


Suo H.,Jizhong Energy Group Co.
Zhongguo yi liao qi xie za zhi = Chinese journal of medical instrumentation | Year: 2013

Random 40 cases of tibial plateau fracture patients were divided into two groups. The treatment group underwent arthroscopic, minimally invasive percutaneous plate osteosynthesis (MIPPO), the control group treated by modified plate fixation. Patients in the treatment group got short average hospitalization time, the total effective rate was 95%, total effective rate of the control group was 75%, there was significant difference. MIPPO in the treatment of tibial plateau fractures has good curative effect, less adverse reaction, is worth promoting.


Zhao Q.-B.,Jizhong Energy Group Co. | Liu C.-W.,University of Sichuan
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

In order to research the remain tunnel along the mining hollow district method of medium thickness seam with safe, economical and reliable, by plastic elasticity and rock mechanics theory in depth analysis, according to mine pressure and strata control basic theory, combination of field measurement and numerical simulation calculation, proposed the classification method of roadway surrounding rock which impacted by the repeated mining, in other words, to limit equilibrium area within the depth of surrounding rock classification index, appropriated support design criteria, proposed design concept of specially "combination support", developed the combination support of coincidence remain tunnel surrounding rock different time-space mine pressure law with the function of superpower roof cutting, high resistance transfer pressure, yielding coordination and so on. Experiment shows that "combination support" can obtruncate fire bank filling the wall seasonable.


Liu J.-G.,Jizhong Energy Group Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

Based on coal mining disturbance on the ecological environment, the concept of low-carbon ecological mine was put forward, discussed the construction mode and evaluation index system of low-carbon ecological mining. Rely on technological innovation, achieved the purpose of green mining and low-carbon ecological construction such as filling coal mining, water preserved mining, gas extraction and utilization, geothermal energy utilization and circular economy. Mine safety and high level of intensive, resource recovery and the utilization rate of "three wastes" was improved, achieved the purpose of reducing energy consumption and protecting ecological environment, which provided an effective way for low-carbon ecological mining construction.

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