Time filter

Source Type

Qin Z.,Shandong University of Science and Technology | Jia H.B.,Shandong Xinjulong Energy Ltd Liability Company | Kong H.L.,Shandong University of Science and Technology
Advanced Materials Research | Year: 2014

Non-mining fracturing of shaft lining is a special mine geological disaster in Huadong thick alluvium Mining Districts, which is mainly induced by the additional stress result from compressive deformation of the bottom aquifer water loss. On the basis of summarizing the geological conditions and failure characteristics of non-mining fracturing of shaft lining, this paper analyses the size and variation with different influencing factors of additional stress in outer wall through establishing 3-D numerical modeling. The relationship between stress condition of non-mining fracturing of shaft lining and head loss of bottom water-bearing stratum is determined using the classic elastic solution to thick-walled cylinder according to the proceeding modeling results; and the head loss of bottom water-bearing stratum corresponding to the failure limit state of pitshaft damage is obtained. © (2014) Trans Tech Publications, Switzerland.


Guo F.,Shandong Xinjulong Energy Ltd Liability Company | Gao F.,Shandong University of Science and Technology | Guo S.,Shandong University of Science and Technology | Ma H.G.,Shandong University of Science and Technology
Applied Mechanics and Materials | Year: 2013

This paper countered with the problem of the trackless rubber tire vehicle transport traffic jam in coal mine's auxiliary transportation system at present, based on the transport characteristic of the trackless rubber tire vehicle and different transport roadway underground, putting forward the planning and research method of the trackless rubber tire vehicle transport line in the coal mine. The research has very important practical significance to realize reasonable scheduling of the trackless rubber tire vehicle underground the coal mine. © (2013) Trans Tech Publications, Switzerland.


Wei-Feng W.,Xi'an University of Science and Technology | Yuan-Bin H.,Xi'an University of Science and Technology | Jun D.,Xi'an University of Science and Technology | Nai-Guo W.,Shandong Xinjulong Energy Ltd Liability Company | Li M.,Xi'an University of Science and Technology
Disaster Advances | Year: 2016

To solve the technical problems of coal spontaneous combustion danger degree, the prediction method of fusion recognition for characteristic information of coal spontaneous combustion is proposed. It is concluded that the prediction classification accuracy of SVM is 80% and PSO-SVM is approximately 100%. The results show that the PSO - SVM algorithm can significantly improve the prediction accuracy which provides criterion for the diagnosis and early warning of coal spontaneous combustion. It is of great significance and practical application value for improving the level of prevention and control technology of coal spontaneous combustion early hazards.


Xiao T.-Q.,Henan Polytechnic University | Zhi G.-H.,Henan Polytechnic University | Zhang Z.-G.,Shandong Xinjulong Energy Ltd Liability Company
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2013

In this paper, aimed at controlling the stability of roadway surrounding rock in deep tectonic stress field, relationship between ground stress distribution and roadway stability was studied. Through ground stress measurement and inversion, the deep ground stress field in Juye Mining Area belongs to tectonic stress field. Meanwhile, based on the ground stress distribution characteristics, by using similar simulation, numerical simulation and field test, the effects of buried depth, tectonic stress, roadway layout, fault, etc, on roadway stability were systematically studied. The results show that when buried depth is over 800 m, and lateral pressure coefficient is over 2.5, roadway deformation increases rapidly, plenty of shoulder bolts are broken, the shear failures in roof and floor are serious, and the thick top coal appears "fastigium" shape collapse. Meanwhile, ground stress is higher near fault structures, and the larger the angle between roadway and the maximum horizontal stress is, the larger roadway deformation is, and the more serious the damage of support structure is. Thus, the surrounding rock control in roadway roof and shoulder needs strengthening in deep tectonic regions.


Xiao T.,Henan Polytechnic University | Wang X.,China University of Mining and Technology | Zhang Z.,Shandong Xinjulong Energy Ltd Liability Company
International Journal of Mining Science and Technology | Year: 2014

In order to effectively control the deformation and failure of surrounding rocks in a coal roadway in a deep tectonic region, the deformation and failure mechanism and stability control mechanism were studied. With such methods as numerical simulation and field testing, the distribution law of the displacement, stress and plastic zone in the surrounding rocks was analyzed. The deformation and failure mechanisms of coal roadways in deep tectonic areas were revealed: under high tectonic stress, two sides will slide along the roof or floor; while the plastic zone of the two sides will extend along the roof or floor, leading to more serious deformation and failure in the corner of two sides and the bolt supporting the corners is readily cut off by the shear force or tension force. Aimed at controlling the large slippage deformation of the two sides, serious deformation and failure in the corners of the two sides and massive bolt breakage, a "controlling and yielding coupling support" control technology is proposed. Firstly, bolts which do not pass through the bedding plane should be used in the corners of the roadway, allowing the two sides to have some degree of sliding to achieve the purpose of "yielding" support, and which avoid breakage of the bolts in the corner. After yielding support, bolts in the corner of the roadway and which pass through the bedding plane should be used to control the deformation and failure of the coal in the corner. "Controlling and yielding coupling support" technology has been successfully applied in engineering practice, and the stability of deep coal roadway has been greatly improved. © 2014 Published by Elsevier B.V.


Xiao T.-Q.,Henan Polytechnic University | Li H.-Z.,Henan Polytechnic University | Xu Y.,China University of Mining and Technology | Zhang Z.-G.,Shandong Xinjulong Energy Ltd Liability Company
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

In deep tectonic stress area, shoulder bolt broken and failure phenomenon is prominent in coal roadway; and it's easy to induce roof collapse accident. It is an immediate requirement to solve support failure problem. In view of "shoulder bolt breakage" in deep coal roadway under the action of tectonic stress, a mechanical analysis model of shoulder bolt is established to analyze the action of slippage of coal ribs along roof on bolts; and stress and deformation characteristics of shoulder bolt are gotten. Shoulder bolt breaking mechanism is discovered. Under slippage shear force produced by tectonic stress, bending deformation of bolt body happens; and the shear force of shoulder bolt is biggest in interface between coal seam and roof, where the bolt body is cut off easily. Focused on the problem of shoulder bolt breakage, "controlling and yielding coupling support" control technology is put forward. The research results have been successfully applied to engineering practice.


Liu J.,North China Institute of Science and Technology | Jiang F.,University of Science and Technology Beijing | Sun G.,Shandong Xinjulong Energy Ltd Liability Company | Zhang Z.,Shandong Xinjulong Energy Ltd Liability Company | Tan W.,Shandong Xinjulong Energy Ltd Liability Company
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2014

The mechanism of intensive venting pulverized coal to prevent coal burst was studied through laboratory tests and numerical simulation. The methods of determining the parameters such as the spacing and diameter of boreholes and controlling the coal burst were presented. It is found that the main functions of the spacing of boreholes for coal burst control is a function of borehole diameter, coal thickness, spill-over coefficient, is positive correlated with the spill-over coefficient or the borehole diameter, and is negative correlated with the coal seam thickness or the safe-raising deformability. The intensive venting pulverized coal applied at the stage of pre-depressurizing is to reduce the elastic modulus and raise the deformability and at the stage of relieving danger is to absorb the energy and increase the resistance. The ideas are applied to working front of number 1302 of Xinjulong Mine with a good result.


Liu J.-H.,University of Science and Technology Beijing | Jiang F.-X.,University of Science and Technology Beijing | Wang N.-G.,Shandong Xinjulong Energy Ltd Liability Company | Zhang Z.-G.,Shandong Xinjulong Energy Ltd Liability Company | Zhao R.-X.,Shandong Xinjulong Energy Ltd Liability Company
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

In order to study abutment pressure distribution characteristics of fully mechanized caving face in extra-thick coal seam of deep shaft, field measurement of vertical stress in coal mass around the working face was carried out by using coal rockburst monitoring system at 1301 working face in Xinjulong Mine. The research results show that the distance between the peak of strike abutment pressure and the coal wall as well as the distance between the peak of lateral abutment pressure and the laneway's side of fully mechanized caving face in extra-thick coal seam of deep shaft is larger than that of a common face; the peak of lateral abutment pressure in the roadside coal appears in the back of working face; the variation of vertical stress in the roadside coal along strike during the extraction can be distinguished to stress steadiness zone, stress increasing zone, stress peak zone, stress decreasing zone, secondary increasing zone and stress creep zone.


Wang N.,Shandong Xinjulong Energy Ltd Liability Company | Zhu S.,University of Science and Technology Beijing | Wang H.,Shandong University | Jiang F.,University of Science and Technology Beijing
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2016

According to the rock burst prevention problem of fully mechanized caving face under deep alluvium in Xinjulong coal mine, field research was conducted to study connected effect between surface subsidence and rock burst. The results show that the starting distance of surface subsidence in fully mechanized caving face under deep alluvium is about 114 m, which is merely 1/7 of the mining depth and much lower than the starting distance of mining depth in general mining conditions. When the surface is in the full-mining stage, an obvious connected effect is observed between the surface subsidence velocity and rock burst. When the surface subsidence velocity increases rapidly, the dynamic pressure manifestation can occur strongly in working face, and the rapid increase of surface subsidence velocity is generally ahead of dynamic pressure manifestation. Based on a comprehensive analysis of seismic and surface subsidence data, a certain correlation is verified between the occurrence of rock burst, surface subsidence and strata movement, which can be used as an auxiliary reference for rock burst pre-warning. © 2016, China University of Mining and Technology. All right reserved.


Liu J.,University of Science and Technology Beijing | Jiang F.,University of Science and Technology Beijing | Sun G.,Shandong Xinjulong Energy Ltd Liability Company | Lu S.,Shandong Xinjulong Energy Ltd Liability Company | Zhang D.,Shandong Xinjulong Energy Ltd Liability Company
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2012

Support selection is the key to application of advanced support technology with hydraulic support in gateways of coal face. Taking the selection of advanced hydraulic support in gob-side entry of working face 1302 in Xinjulong Mine as engineering background, the difference between the side strata structure of gob-side face and that of primary face is discussed;and the relationship between support and surrounding rock in gob-side entry of fully mechanized caving face is studied. Based on the moment equilibrium relations, mechanical model for determination of advance support strength in gob-side entry is established;and the viewpoint that strata rotary angle is the control object is proposed. Prediction of surrounding rock deformation of the gob-side entry is constructed by using displacement state equation of basic roof. Bearing capacities of coal pillar and solid side of the gob-side entry are calculated using the elastic mechanical theory. With the principle of squeeze nonoccurrence, the conclusions that the critical rotary angle of basic roof is 2.7°and the critical strength of advance support in the gob-side entry is 0.50 MPa are obtained. The advanced hydraulic support of ZTC30000/25/50 type is selected according to the results. Finally, the reasonableness of the support is verified by using observation result of surface displacement of the gob-side entry. The results can provide a reference for determination of reasonable strength of advanced support and support selection.

Loading Shandong Xinjulong Energy Ltd Liability Company collaborators
Loading Shandong Xinjulong Energy Ltd Liability Company collaborators