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2011 2nd International Conference on Mechanic Automation and control engineering, MACE 2011

作者： Li, Xiaoshuang Li, Yaoji Yin, Guangzhi He, Lin National Engineering Research Center of Phosphate Resources Development and Utilization Chongqing University Chongqing 400030 China State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam Chongqing University Chongqing 400030 China Key Lab. for the Rsrc. Exploitation and the Environ. Disaster Control Engineering in Southwest China State Ministry of Education Chongqing University Chongqing 400030 China Yunnan Phosphate Chemical Group Co. LTD. Jinning 650600 China

ISBN: (纸本)9781424494392

Based on the gently inclined medium thick phosphate rock of the deep part of the east mining section of +2150 level of Jinning-Six mine of Yunnan phosphate Co., Ltd, the similar simulation model experiment of the stability of stope roof under cemented backfilling mining of waste rock was carried out by the mine pressure plane stress modeling experimental frame of college of resource and environmental sciences. Based on the experimental results, the stress changing law of the above roof of stope roof after the filling of stope along the strike direction of phosphate were investigated. Then the gently inclined medium thick phosphate rock of the deep part of the east mining section of Jinning-Six mine of Yunnan phosphate Co., Ltd could efficiently recover, and the surface in mining areas could also be protected. © 2011 IEEE.

关键词： Roofs

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Experimental studies on crack parameters identification in the pipe based on L(0, 2) ultrasonic guided wave

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Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology 2011年第SUPPL.1期31卷 8-11页

作者： Zhang, Wei-Wei Zhao, Jun Nie, Zhen-Hua Sun, Jin-Lan Ma, Hong-Wei Mechanics Department Taiyuan University of Science and Technology Taiyuan Shanxi 030024 China The Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Ministry of Education of China Guangzhou Guangdong 510632 China

PZT5-sensors were used to excite and receive the guided wave signal for crack detection. A piezoelectric ring was an excited sensor and 16 piezoelectric patches distributing the circle pipe wall were received sensors. At first, the disperse curve of both the group velocity and the attenuation for L(0, 2) guided wave were plotted. Next, crack detection was performed by the guided wave inspection. For reducing the noise from the guided wave signal, eight points FFT smoothing technology is used to denoise the guided wave signal. Based on the denoised signal, the crack location can be detected successfully. To evaluate the size of the crack, the reflection coefficient, a ratio of the peak of the echo from the crack to the peak of the incident wave, is defined. When the modify factor is 0.8, it could be found that the crack size identification is in good agreement with the theoretical prediction.

关键词： Damage detection

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Analysis in Law Factor on China Coal Mine Safety Production Based on Dummy Variable Model

Analysis in Law Factor on China Coal Mine Safety Production ...

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2011全国特殊气藏开发技术研讨会

作者： TAN Haixia WANG Hongtu REN Huanlin CHEN Lin FAN Xiaogang YUAN Zhigang Academy of Urban and Environment Science Huazhong Normal University Wuhan 430079 China Geology and Mineral Resources Exploration Academy of Yunnan Geology and Mineral Resources Bureau Kunming 650051 China Key Lab for Exploitation of China Southwestern Resources & Environmental Disaster Control Engineering Ministry of Education Chongqing University Chongqing 400030 China

To make clear the factors influence China coal mine safety production, the multiple regression model of the death rate per million tons coal show that level of mechanical coal mining and investment in capital construction per ton coal have a positive effect on coal mine safely production, and per capita GDP a negative *** comparative analyze the direction and magnitude of some significant laws or regulations on coal mine safety production since 1990, a multiple dummy variable model was *** study finds that the implementation of three laws and one regulation average make China death rate per million tons coal more reduced 0.9956 person;and the effects of PRC Coal Law is unworthy on coal mine safely production relative to PRC Mine Safety Law, PRC Safety Production Law and the Regulation of Reporting and Investigating Production Accident, the ratio of deterrent effect of the latter three laws on coal mine safety production is about 6:13:13.

关键词： coal mine safety production law dummy variable model comparative analysis

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Visualization of damage detection for circular arch based on stochastic subspace identification

Visualization of damage detection for circular arch based on...

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International Conference on Artificial Intelligence and Computational Intelligence (AICI)

作者： Nie, Zhenhua Zhao, Jun Ma, Hongwei Cheng, Liangyan Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Ministry of Education of China Guangdong Guangzhou China School of Civil Engineering Henan Polytechnic University Jiaozuo China

ISBN: (纸本)9780769542256

When performing vibration tests on civil engineering structures, it is often unpractical and expensive to use artificial excitation (shakers, drop weights). Ambient excitation on the contrary is freely available (traffic, wind), but it causes other challenges. The ambient input remains unknown and the system identification algorithms have to deal with output-only measurements. The empirical mode decomposition (EMD) based stochastic subspace identification procedure utilizing operational vibration measurements is presented in this paper. The SSI method is then applied to the decomposed signals to yield the modal parameters of the hinged circular arch which is divided into sixteen elements, and then the strain mode shapes are obtained. In order to let the non-specialist to understand the message of the damages, the strain modes of the arch are presented with visual images. Visualization of damage detection has great potential for development of On-line structure health monitoring. © 2010 IEEE.

关键词： Damage detection

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Contribution of Safety to Mining Economic Growth in China

Contribution of Safety to Mining Economic Growth in China

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2011全国特殊气藏开发技术研讨会

作者： Tan Haixia Wang Hongtu Yuan Zhigang Liu Jingcheng Chen Lin Haladou Abdou State and local joint engineering laboratory of methane drainage in complex coal gas seam Chongqing Key Lab for Exploitation of China Southwestern Resources & Environmental Disaster Control Engineerin Geology and Mineral Resources Exploration Academy of Yunnan Geology and Mineral Resources Bureau Ku School of Economics and Business administration Chongqing UniversityChongqing 400030 China

Safety input is a safeguarding force to mining, as well as one of main reasons for the increased growth rates of Total Factor Productivity (TFP).To figure out the contribution of the safety input to mining economic growth, a new production safety index system with six principal items describing China mining safety was *** study found that China mining production safety level was improved continuously from 0.462 in 1991 to 7.687 in 2007, a more than 16-fold *** co-integration theory and dynamic construction model, a mining economic growth model was established based on the new production safety index *** empirical results prove that labor input and capital input are still major factors to promote mining economic growth, and the production safety not only contributed the short-term GDP growth of mining industry but also helped present 7% of contribution rate to the long-term elasticity coefficient.

关键词： mining production safety index economic growth model contribution rate of safety input to economy growth

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Characteristics of deformation, failure and strain energy of sandstone under cycling loading in post-peak

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Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and engineering 2011年第SUPPL. 2期30卷 3892-3898页

作者： Guo, Chenye Xian, Xuefu Jiang, Yongdong Wang, Chen Key Lab. for Exploitation of Southwest Resources and Environmental Disaster Control Engineering Chongqing University Chongqing 400030 China Chongqing Energy Investment Group Science and Technology Co. Ltd. Chongqing 400060 China

In order to understand the characteristics of deformation, failure and strain energy of the fractured rock sample under continuous loading, triaxial compression tests of the sandstone sample from Yongchuan mine are carried out by a MTS815 rock testing system. Based on the experimental results, the fractured ratio(r) is developed, it reflects the ratio of the break between the fractured sample and the perfect sample, smaller r means the larger fracture for the rock sample, the maximum and the minimum value of r is 1and the ratio of residual strength and peak strength. The results of this analysis showed that the fractured ratio has good linear relationship with the secant modulus, axial strain, Poisson's ratio and strain energy;after continuous loading, the failure mode of fractured rock sample appears 'X' shear failure mode;the maximum of Poisson's ratio of rock can be determined by the test under continuous loading. These conclusions have a great significance to understand the mechanism of rock outburst and rockburst.

关键词： Rock mechanics

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Risk analysis of ground subsidence accidents caused by underground storage caverns in salt rock

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Yantu Lixue/Rock and Soil Mechanics 2011年第SUPPL.2期32卷 544-550页

作者： Jing, Wen-Jun Yang, Chun-He Kong, Jun-Feng Ji, Wen-Dong State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China Key Lab. for Exploitation of Southwestern Resources and Environmental Disaster Control Eng. Ministry of Education Chongqing University Chongqing 400044 China

In the construction and operation processes of underground storage cavern in bedded salt, ground subsidence, even earth surface collapse accidents, resulted by the storage cavern contraction and overlying rock deformation is an important accident type. Aimed at the ground subsidence accidents caused by underground storage cavern, this paper reveals the mechanism and builds the fault tree model of this type of accidents, finds out 14 failure patterns as well as 10 basic influence factors, also, puts forward the related control measures. Then Yunmeng-Yingcheng salt mine is taken as an example to forecast the severity of accident consequence. On the premise that ground subsidence accident happened at Yunmeng-Yingcheng salt mine, the severity probability of the accident consequence is analyzed using fuzzy comprehensive evaluation. Research results show that the severity of accident consequence belong to negligible level, to be considered level, serious level, very serious level and calamitous level are 0.24, 0.28, 0.29, 0.15, 0.04 respectively. The results are useful to prevent ground subsidence accidents caused by the storage caverns. What's more, it also provides according theory and a feasible way for appraising the loss severity before the accident happening.

关键词： Subsidence

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Research on gas distribution pattern in deep coal-bed based on in-situ detection

Research on gas distribution pattern in deep coal-bed based ...

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International Conference on Digital Manufacturing and Automation (ICDMA)

作者： Xu, Jiang Peng, Shoujian Zhang, Dandan Yang, Hongwei Key Lab. for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering Ministry of Education Chongqing University Chongqing 400044 China

ISBN: (纸本)9780769542867

Knowing about the distribution of gas pressure in coal seam is significative to study the flow of coal seam gas, the occurrence and the change of dynamic phenomenon. An in-situ detection is used to detect the in-situ occurrence of gas in No.3 coal seam in Sihe coal mine of Jincheng Anthracite Mining Group in Shanxi province. The distribution of gas pressure around the holes and the change of the content of gas are studied abstractly, which based on the mathematical simulation of the seam gas-seepage. The results show that insitu detection technique of coal seam gas could shorten the time of from founding the coal to starting to detect, which observably improved the accuracy of testing data, and meanwhile, made up for the deficiency of traditional detection technique in the loss of pressure at earlier stage. It is concluded that the pressure of the initial reservoir gas was about 0.3MPa, from the results of the detection of No.3 coal seam in Sihe coal mine. In order to simulate the distribution of gas pressure surrounding the drilling hole in No.3 coal seam in Sihe coal mine, the mathematical models of the seam gas-seepage were built through COMSOL numerical simulation software. From the results of simulation, the dates on the distribution of gas pressure and the content of gas were obtained. © 2010 IEEE.

关键词： Coal mines

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Inducing action of stress wave for coal and gas outbursts

Inducing action of stress wave for coal and gas outbursts

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作者： Zhao, Zhigang Tan, Yunliang Zhao, Tongbin Key Laboratory of Mine Disaster Prevention and Control Shandong University of Science and Technology Qingdao 266510 China Key Lab. for the Exploitation of Southwestern Rsrc. and the Environ. Disaster Control Engineering Ministry of Education China

ISBN: (纸本)9789078677383

There are many influence factors for coal and gas outburst, in which the stress wave is the most important one of the non-geological factors. Using the implicit-explicit analytical function of ANSYS/LS-DYNA, the response of roadway surrounding rock under the stress wave is simulated and the inducing effect of stress wave is studied. It is found that, under stress wave, tensile stress and compressive stress occurs in roadway surrounding rock. The vertical pressure of left side midpoint and horizontal pressure of right side midpoint act mainly as tensile pressure, and the pressure value increases along with the stress wave intensity. The horizontal displacement time curve of roof and floor and left side midpoint can be described as this: the value decreases deeply from plus peak to minus peak during Oms -10ms, and the evolution of right side midpoint is reverse to that of left side midpoint. The horizontal velocity time curve of roof and floor midpoint is that the value decreases deeply from peak to trough, then increasing slowly and keep flat. The horizontal velocity time curve of left side midpoint is similar to cosine curve and of right side midpoint is similar to sinusoid curve. © Atlantis Press, 2010.

关键词： Floors

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Analysis of nonlinear dynamic character in the surrounding rock system for deep buried underground engineering

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Journal of Coal Science & engineering(China) 2010年第4期16卷 362-366页

作者： ZHAO Yu PENG Hal-you College of Civil Engineering Chongqing University Chongqing 400045 China Education Ministry＇s Key Lab for the Exploitation of Southwestern Resources ＆ Environmental Disaster Control Engineering Cbongqing University Chongqing 400044 China

Combining the field monitoring results of a deep-buried tunnel in Chongqing,the dynamic characteristics of the surrounding rock system under high in situ stress wasanalyzed by phase space reconstruction, calculating correlation dimension, Kolmogoroventropy and largest Lyapunov *** the Kolmogorov entropy and largestLyapunov exponents show that the surrounding rock system is a chaotic *** onthis, a local model was applied to predict surrounding rock displacement, and a nonlineardynamic model was derived to forecast the interaction of the surrounding rock and *** local method was found to have an extremely small total ***, thenonlinear dynamic model forecasting curves agree with the monitoring ones very *** isproved that the nonlinear dynamic characteristic study is very important in analyzing rockstability and predicting the evolution of rock systems.

关键词： nonlinear dynamics rock deep-buried underground engineering

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