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Energy dissipation of coal and rock during damage and failure process based on EMR

International Journal of Mining Science and Technology 2015年第5期25卷 787-795页

作者： Song Dazhao Wang Enyuan Li Zhonghui Liu Jie Xu Wenquan School of Safety Engineering China University of Mining & Technology Postdoctoral Research Station Yongcheng Coal & Electricity Holding Group Co.Ltd. State Key Laboratory of Coal Resources & Safe Mining Shaanxi Coal and Chemical Technology Institute Co. Ltd.

The physical and mechanical change processes of coal and rock are closely related to energy transformation,and the destruction and failure of coal and rock is an instability phenomena driven by energy ***,the energy change of large-scale coal rock in the mine site is hardly calculated accurately,making it difficult to monitor coal-rock systematic failure and collapse from the perspective of *** the energy dissipation EMR monitoring system,we studied the damage and failure of coal and rock with bursting liability from the energy dissipation point using the geophysical method-EMR,and explored the energy dissipation characteristics during uniaxial compression and their main influencing *** results show that under displacement-control loading mode,there are 2 types of energy dissipation trends for both coal and rock with bursting *** type Ⅰ trend is a steady increase one during the whole process,therein,the energy dissipation of rock samples is accelerated at the peak *** type Ⅱ trend energy is a W-shaped fluctuating one containing 6 *** load-control loading mode,there is one energy dissipation trend of shock downward-steady *** that,rock samples also present a trend of 4 *** energy dissipation characteristics of coal and rockduring loading failure process can be used as effective criteria to assess whether they are in a stable or destructive *** factors influencing energy dissipation in the loading failure process of coal and rock mainly include strength,homogeneity,and energy input efficiency.

关键词： Energy dissipation Electromagnetic radiation Coal and rock damage and failure Rock burst

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Comparison of Acoustic Emission Characteristics for C/SiC Composite Component Under Combination of Heating and Mechanical Loading

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Acta Metallurgica Sinica(English Letters) 2017年第10期30卷 992-998页

作者： Zhi-Yong Tan Chang-Wan Min Hong-Wei Wu Yu-Hai Qian Mei-Shuan Li Science and Technology on Space Physics Laboratory Beijing Institute of Nearspace Vehicle's Systems Engineering Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinse Academy of Sciences

The acoustic emission（AE） characteristics of C/SiC composite component under various conditions were compared, with the purpose of identifying the possible damage and failure mechanism. During the process of the single mechanical loading, the highest amplitude of the AE signal was less than 85 dB and the main damage forms of matrix cracking and interface debonding were involved. For the heating process, high-energy AE signals with an amplitude more than 85 dB were detected and fiber fracture mechanism was determined as well due to the thermal stress caused by the mismatch of the thermal expansion coefficient between the reinforced fiber and matrix. During the combination process of the heating and mechanical loading, it was concluded that the degree of damage was much severer than the simple superposition of damage produced by the individual mechanical loading and the individual heating process.

关键词： C/SiC composite damage and failure Heating Mechanical loading Acoustic emission

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Study on the critical stress threshold of weakly cemented sandstone damage based on the renormalization group method

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International Journal of Coal Science & Technology 2020年第4期7卷 693-703页

作者： Zhaoyang Song Hongguang Ji Zhiqiang Liu Lihui Sun Beijing China Coal Mine Engineering Company Limited.Beijing 100013 China School of Civil and Resource Engineering University of Science and Technology Beijing.Beijing 100083China School of Mining and Geomatics Hebei University of Engineering.Handan 056038.China

During the microstructural analysis of weakly cemented sandstone,the granule components and ductile structural parts of the sandstone are typically *** the contact between granules in the microstructure of weakly cemented sandstone,three basic units can be determined:regular tetrahedra,regular hexahedra,and regular *** group models with granule-and pore-centered weakly cemented sandstone were established,and,according to the renormalization group transformation rule,the critical stress threshold of damage was *** results show that the renormalization model using regular octahedra as the basic units has the highest critical stress *** threshold obtained by iterative calculations of the granule-centered model is smaller than that obtained by the pore-centered *** granule-centered calculation provides the lower limit(18.12%),and the pore-centered model provides the upper limit(36.36%).Within this range,the weakly cemented sandstone is in a phase-like critical *** is,the state of granule aggregation transforms from continuous to *** the relative stress range of 18.12%-36.36%,the weakly cemented sandstone exhibits an increased proportion of high-frequency signals(by 83.3%)and a decreased proportion of low-frequency signals(by 23.6%).The renormalization calculation results for weakly cemented sandstone explain the high-low frequency conversion of acoustic emission signals during *** research reported in this paper has important significance for elucidating the damage mechanism of weakly cemented sandstone.

关键词： Weakly cemented sandstone Renormalization group method damage and failure Threshold

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