Key Laboratory of Western Mines and Hazard Prevention

Fengcheng, China

Key Laboratory of Western Mines and Hazard Prevention

Fengcheng, China
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Cao J.,Xi'an University of Science and Technology | Cao J.,Key Laboratory of Western Mines and Hazard Prevention | Lai X.,Xi'an University of Science and Technology | Lai X.,Key Laboratory of Western Mines and Hazard Prevention | And 2 more authors.
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2017

The study on loading transmission of thin coal roof in shallow contiguous coal seams was applied by physical simulation experiments in order to solve the problem of severe roof weighting. Traits of underground pressure and relationships between roof fracture and loading transmission were clear. It indicated that strata behaviors in the study area were salient definitely and pressure intensity was violent in general. The distance between working face and stress peak zone is about 20 m while the distance of abutment pressure significantly affect is about 40 m. The value of stress is generally 6~10 MPa and the range of stress concentration factor is 2 to 3.3. The same vein main roof was apt to cause tension cracks in the front of the working face. Periodic pressure resulted in bedded rock plates being differential arc which would rotate to form hinge structure ebringing abour the phenomena of re-arch. The load-transmitting factor is 4.63 by calculating. According to acoustics emission (AE) monitoring, high frequency and energy signals were dominant. Furthermore, strata caused obvious loading transmission when AE signals increased abruptly or decreased after continuously raising. © 2017, Editorial Office of Journal of Xi'an University of Architecture & Technology. All right reserved.


Zhao D.-Y.,Xi'an University of Science and Technology | Zhao D.-Y.,Key Laboratory of Western Mines and Hazard Prevention | Lai X.-P.,Xi'an University of Science and Technology | Lai X.-P.,Key Laboratory of Western Mines and Hazard Prevention | And 5 more authors.
IOP Conference Series: Materials Science and Engineering | Year: 2017

This paper introduces the composition, working principle and characteristics of the new gas monitoring system, which are used to monitor the gas in the gob area and working face of the mine in real time. According to the oxygen concentration, the spontaneous combustion of gob area "three zones" was determined and divided. In order to carry out disaster early warning, the methane and carbon monoxide super gas concentration changes were studied and analyzed. And the variation law of gas concentration in gob area and coal face in coal mining was obtained. This study provides reference for the follow-up fire prevention and production. © Published under licence by IOP Publishing Ltd.


Tian S.-C.,University of Science and Technology of China | Tian S.-C.,Key Laboratory of Western Mines and Hazard Prevention | Hui L.,University of Science and Technology of China | Hui L.,Key Laboratory of Western Mines and Hazard Prevention | And 2 more authors.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2017

Through the analysis of major fatal accidents occurred within 30 years from 1986 to 2016 in China’s coal mines, it reflects that human errors accounting for up to 80% of the total accidents. The coal mines have set up a variety of safety signs that can alert miners to be careful with the insecurity in the workplace, and guide them to behave safely in accordance with legal standards. However, the human-induced accidents still occur. The problem is that although the safety signs have been adopted universally in the coal mines as a kind of management strategy, they are hard to play the safety signs’ due role in the practical application. The low effectiveness of safety signs is one of the important reasons for the coal mines accidents. In order to settle the practical problems and improve the safety level of coal mines, this research is designed to study the effectiveness of safety signs in coal mines. As a result of the previous researches, the author divided safety signs in coal mines’ practical application into four stages by utilize ‘communication-human’ information processing model and determined the effective factors of safety signs in accordance with the transfer characteristics of each stage. Thus the author had already established the effective factors system of safety signs and determined the weight of factors that influence the safety signs’ effectiveness by using the method of Analytic Hierarchy Process. The paper selected the setting positions of safety signs according to the importance ranking of safety signs’ effectiveness factors. In order to study the setting positions that affect the safety signs’ effectiveness, the author carried out an experiment of eye movement. Through the use of an experimental plat of eye-movement Tobii Studio 4.3.2, whose hardware service is an eye tracker Tobii T60XL, a series of experiments were performed. The attention in visual feature of experiment participants can be gotten quantificationally from the angle of visual. In this experiment, in the light of the most common scenes in coal mines’ daily producing activities, the belt transportation is selected as well as the mine opening, underground roadway and other four typical scenes as the visual stimulating materials, which used picture pattern to present. This experiment adopted 36 pictures totally to be the experimental materials that covered with four different scenes and safety signs set in different positions respectively, including 18 pictures on the ground of coal mines and 18 pictures under the ground of coal mines. The experiment began with the instructions and then participants conducted an experiment through clicking the buttons on their own. The presentation time of each picture was 2 s and before playing the picture, it should have five unit-vectors with eye-movement calibration. The eye tracker could record and gather eye-movement data of different participants automatically, such as the time of first fixation, the first fixation duration, and the first fixation count and other eye-movement data. After collecting the eye-movement data, it was necessary to set up the safety signs in selected scenes to be the regions of interest (RIO). With the purpose of studying thoroughly, the paper divided the plane visual stimulating images into nine regions that could cover the whole pictures and numbered for each region. No. 1 to No. 9 showed different setting positions of safety signs in simulative scenes and selected the setting positions as the control factors. Then the author stacked the experimental data of each participant and exported orbit diagrams of fixation point of different setting positions’ safety signs in the scenes of belt transportation, underground roadway and the mine opening. Finally, the experimental data was analyzed with the combination of the commercial software SPSS20.0, statistical methods and the theory of visual attention. It can be seen from the results of the homogeneity of variance that when safety signs set in the different positions, a significant test of the first fixation count in regions of interest is .000 < 0.05 and a significant test of the time of first fixation in regions of interest is .045 < 0.05, both reaching the significant level. The results indicate that there is significant difference among the eye-movement parameters of different setting positions. As for the safety signs on the ground of coal mines, the maximum number of the first fixation count is 0.850 and the minimum time of first fixation is 0.4015 s in the position of No. 5 and for the safety signs under the ground of coal mines, the maximum number of the first fixation count is 0.925 and the minimum time of first fixation is 0.508 s in the position of No. 2. Consequently, these results suggest that the position of No. 5 and No. 2 attract the most attention of participants. The position of No. 5 and No. 2 are proved to be the most effective setting position. The study can be helpful to the establishment and application of the safety signs in coal mines and ensure safety production. © Springer International Publishing AG 2017.


Cui F.,Xi'an University of Science and Technology | Cui F.,Key Laboratory of Western Mines and Hazard Prevention | Lai X.P.,Xi'an University of Science and Technology | Lai X.P.,Key Laboratory of Western Mines and Hazard Prevention | And 2 more authors.
Rock Mechanics: Achievements and Ambitions - Proceedings of the 2nd ISRM International Young Scholars' Symposium on Rock Mechanics | Year: 2012

Low recovery is a problem existing in top coal caving mining of steep and thick coal seams. Pre-blasting in top-coal for weakening the coal seam is proposed to solve this prblem. Based on the background of pre-blasting working face in Jiangou coal mine, the numerical analysis model of long holes pre-blasting was established. By numerical analysis with nonlinear program LS-DYNA, the parameters of blasting for presplit coal, stress-strain state in the pre-blasting influenced zone were studied. The purpose of the study was for keeping stability of the surrounding roadways while effective weakening in the top coal. The results showed that thickness of the retaining top coal above the support frane was 3.0 to 4.0 meters, the horizontal distance between final position for pre-explosion hole and roadway was not less than 4 meters, the vertical distance between explosive bottom for pre-explosion hole and the top of roadway was not less than 4 meters, the row spacing for pre-explosion hole was 4.0 meters. Pre-blasting with these parameters got effective weakening results with the roadways in stable conditions. © 2012 Taylor & Francis Group.


Tian S.C.,Xi'an University of Science and Technology | Tian S.C.,Key Laboratory of Western Mines and Hazard Prevention | Yang X.J.,Xi'an University of Science and Technology | Yang X.J.,Key Laboratory of Western Mines and Hazard Prevention
Conference Proceedings of the 4th International Symposium on Project Management, ISPM 2016 | Year: 2016

As the importance of the effect of judging the miners' unsafe behavior factors, as much as possible to prevent unsafe behavior, we use the related principle of AHP, the establishment of composed of four first-order factors and 16 second level factors of unsafe behavior influencing factors set, hierarchical structure model is constructed, through expert scoring, these factors were compared. Using MATLAB software to calculate the weight of primary factors and secondary factors, and weight of the total order and consistency test, to analyze the importance for influencing factors. The most important is environmental factors in importance ranking. It will be as the miners' unsafe behavior pre control basis, provides certain reference value to the prevention and control of coal mine accidents.


Lai X.-P.,Xi'an University of Science and Technology | Lai X.-P.,Key Laboratory of Western Mines and Hazard Prevention | Qi T.,Shenhua Xinjiang Energy Co. | Jiang D.-H.,Shenhua Xinjiang Energy Co. | And 6 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

Initially, according to theoretical analysis, investigations of geological environment and mining conditions, the methodology was proposed to monitor multiple indicating upon coal/rock fracture and destabilization. Afterwards, the borehole stress apparatus indicating vertical stress, optical borehole peeper and broken range of top coal instrument, etc. were performed in mining field, the regularity of stress and deformation of top coal were analyzed comprehensively in the process of the segment pre-blasting. Ultimately, the dimension of segment pre-blasting and supporting were confirmed, respectively, to be of 10.0~35.0 m and 0~45.0 m.


Cui F.,Xi'an University of Science and Technology | Cui F.,Key Laboratory of Western Mines and hazard Prevention | Lai X.P.,Xi'an University of Science and Technology | Lai X.P.,Key Laboratory of Western Mines and hazard Prevention | And 2 more authors.
47th US Rock Mechanics / Geomechanics Symposium 2013 | Year: 2013

Majority of the coal seams in Urumqi coal field, located in Xinjiang Province, China, are dipping about or above 45 degrees, called steeply dipping coal seams. The maximum width of the coal seams group is about 50m, and the minimum width is only 20m. and the vertical height is more than 400m. At present, the mining method used for these seams is the horizontal section top-coal caving mining. In this paper, the caving effect of steeply dipping and thick coal seams after weakening are studied with numerical simulation. The migration path and the falling quantity of discrete coal particles are analyzed and the distribution characteristics of hinged force between flowing blocks are intuitively presented. The load change of supports in the process of top-coal caving is monitored in real time, and the expression equation for caving space in flow model is established. The mining practice shows that the coal mass can be separated by using the advance pre-blasting method, which improves the top-coal recovery rate and reduces the loss of resource. Copyright 2013 ARMA, American Rock Mechanics Association.


Zhao J.-H.,Xi'an University of Science and Technology | Lai X.-P.,Xi'an University of Science and Technology | Lai X.-P.,Key Laboratory of Western Mines and Hazard Prevention
Journal of Coal Science and Engineering | Year: 2011

For mining extra-steep-thick coal seam, the sublevel top coal caving is a high efficient method in practical engineering. However, major challenges associated with mining high-section top-coal-caving (HSTCC) are related to the resulting high ground stresses. Inevitability, using the high-section sublevel top coal caving for extra-steep-thick coal seam, the large scale of mined-out area appears. If the prefracture blasting and hydraulic fracture techniques are utilized, the top coal damage and cracks will develop, and the mining complexity will increase, such as seam inclination, continuity, mechanical characteristics of roof and susceptibility of top coal, etc. First, the field conditions of B 1+2 seam were investigated at the +588 level of the Weihuliang Underground Mine of China. Subsequently, according to caving mechanism of strata response obtained from several special models including physical simulation tests and numerical simulation models, the prefracture process including blasting and injecting water were analyzed. Then, the prefracture blasting technique was successfully applied to the caving of 52 m-sublevel seam. Finally, the effects were verified by advanced detecting instruments, and the results show these methods and measurements are feasible and valid. © The Editorial Office of Journal of Coal Science and Engineering (China) and Springer-Verlag Berlin Heidelberg 2011.


Qiu H.F.,Shaanxi University of Science and Technology | Qiu H.F.,Key Laboratory of Western Mines and Hazard Prevention | Lai X.P.,Shaanxi University of Science and Technology | Lai X.P.,Key Laboratory of Western Mines and Hazard Prevention | And 2 more authors.
Transit Development in Rock Mechanics-Recognition, Thinking and Innovation - Proceedings of the 3rd ISRM Young Scholars Symposium on Rock Mechanics, 2014 | Year: 2015

Taking the project in China as background, established a physical model experimental platform to simulate the cavity construction using the similar theory. The influence of interlayer to the cavity construction was studied. It was found: when the interlayer exists, the flow field becomes more complex; and the brine distribution besides the interlayer will be changed. Thus the dissolution of salt rock besides the interlayer was affected which results the triangle insoluble inclination appearing on the top of the interlayer, making the cave building inefficient and being not conducive to the cave shape control. It is the key to make the interlayer reasonable collapse in cavity construction. © 2015 Taylor & Francis Group, London.


Lai X.P.,University of Science and Technology of China | Lai X.P.,Key Laboratory of Western Mines and Hazard Prevention | Shan P.F.,University of Science and Technology of China | Shan P.F.,Key Laboratory of Western Mines and Hazard Prevention | And 6 more authors.
Rock Mechanics and Rock Engineering | Year: 2015

When mechanized sub-horizontal section top coal caving (SSTCC) is used as an underground mining method for exploiting extremely steep and thick coal seams (ESTCS), a large-scale surrounding rock caving may be violently created and have the potential to induce asymmetric destabilization from mine voids. In this study, a methodology for assessing the destabilization was developed to simulate the Weihuliang coal mine in the Urumchi coal field, China. Coal-rock mass and geological structure characterization were integrated with rock mechanics testing for assessment of the methodology and factors influencing asymmetric destabilization. The porous rock-like composite material ensured accuracy for building a 3D geological physical model of mechanized SSTCC by combining multi-mean timely track monitoring including acoustic emission, crack optical acquirement, roof separation observation, and close-field photogrammetry. An asymmetric 3D modeling analysis for destabilization characteristics was completed. Data from the simulated hydraulic support and buried pressure sensor provided effective information that was linked with stress–strain relationship of the working face in ESTCS. The results of the 3D physical model experiments combined with hybrid statistical methods were effective for predicting dynamic hazards in ESTCS. © 2015 The Author(s)

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