|
|
|
| ACOUSTIC EMISSION AND TEMPERATURE VARIATION IN FAILURE PROCESS OF HARD ROCK PILLARS SANDWICHED BETWEEN THICK COAL SEAMS OF EXTREMELY STEEP |
| LAI Xingping1，2，SUN Huan1，2，SHAN Pengfei1，2，WANG Chunlong1，2，CUI Na1，2，YANG Yiran1，2 |
(1. School of Energy and Resource，Xi'an University of Science and Technology，Xi'an，Shaanxi 710054，China；
2. Key Laboratory of Western Mines and Hazard Prevention，Ministry of Education，Xi'an University of Science and Technology，Xi'an，Shaanxi 710054，China) |
|
|
|
|
Abstract Stability analysis of hard rock pillars is significant for hazards prediction to the mining of thick coal seams of extremely steep. Modeling the hard and extremely steep rock pillar experimentally was accomplished with the composite-loading facility. The temperature and acoustic emission(AE) parameters were recorded with the infrared thermal instruments and AE sensors. Areas of heat radiation on the surface of rock pillar were found to emerge with a low temperature area near the boundary，a middle temperature area between boundaries，and a high temperature area across the boundary. The hard rock pillars experienced different stages including the elastic deformation，the micro ruptures and the fracturing instability. The accumulation ratio of AE energy was increased continuously and the temperature in the radiation area was decreased gradually. The reasons of AE and temperature variation during the hard rock pillar failure were the thermo-elastic transformation effect and thermo-friction effect.
|
|
|
|
|
|
| [1] 张 茹，谢和平，刘建锋，等. 单轴多级加载岩石破坏声发射特性试验研究[J]. 岩石力学与工程学报，2006，25(12)：2 584–2 588. (ZHANG Ru，XIE Heping，LIU Jianfeng，et al. Experimental study on acoustic emission characteristics of rock failure under uniaxial multilevel loadings[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(12)：2 584–2 588.(in Chinese))
[2] 刘善军，魏嘉磊，黄建伟，等. 岩石加载过程中红外辐射温度场演化的定量分析方法[J]. 岩石力学与工程学报，2015，34(5)：2 968– 2 975.(LIU Shanjun，WEI Jialei，HUANG Jianwei，et al. Quantitative analysis methods of infrared radiation temperature field variation in rock loading process[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(5)：2 968–2 975.(in Chinese))
[3] WU L X，LIU S J，WU Y H，et al. Changes in infrared radiation with rock deformation[J]. International Journal of Rock Mechanics and Mining Sciences，2002，39(4)：825–831.
[4] 吴立新，王金庄. 煤岩受压红外热像与辐射温度特征实验[J]. 中国科学：D辑，1998，28(1)：41–46.(WU Lixin，WANG Jinzhuang. Study on thermal infrared radiation temperature omen in coal-measure rock yielding underground pressure[J]. Science in China：Series D，1998，28(1)：41–46.(in Chinese))
[5] 谭志宏，唐春安，朱万成，等. 含缺陷花岗岩破坏过程中的红外热像试验研究[J]. 岩石力学与工程学报，2005，24(16)：2 977–2 981. (TAN Zhihong，TANG Chun?an，ZHU Wancheng，et al. Experimental study on infrared thermal image for failure process of granite with fracture[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(16)：2 977–2 981.(in Chinese))
[6] 来兴平，漆 涛，蒋东晖，等. 急倾斜煤层(群)水平分段顶煤超前预爆范围的确定[J]. 煤炭学报，2011，36(5)：718–721.(LAI Xingping，QI Tao，JIANG Donghui，et al. Comprehensive determination of dimension of segment pre-blasting of sub-level top coal caving in steep seams[J]. Journal of China Coal Society，2011，36(5)：718–721. (in Chinese))
[7] 王家臣. 厚煤层开采理论与技术[M]. 北京：冶金工业出版社，2009：88–102.(WANG Jiachen. The theory and technique on the thick coal seams mining[M]. Beijing：Metallurgical Industry Press，2009：88–102.(in Chinese))
[8] BASARIR H，OGE I F，AYDIN O. Prediction of the stresses around main and tail gates during top coal caving by 3D numerical analysis[J]. International Journal of Rock Mechanics and Mining Sciences，2015，76(1)：88–97.
[9] RINNE M，SHEN BT，TOBIAS B. Modeling fracture propagation and failure in a rock pillar under mechanical and thermal loadings[J]. Journal of Rock Mechanics and Geotechnical Engineering，2013，5(1)：73–83.
[10] 李新元，马念杰，钟亚平，等. 坚硬顶板断裂过程中弹性能量积聚与释放的分布规律[J]. 岩石力学与工程学报，2007，26(增1)：2 786– 2 793.(LI Xinyuan，MA Nianjie，ZHONG Yaping，et al. Storage and release regular of elastic energy distribution in tight roof fracturing[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(Supp.1)：2 786–2 793.(in Chinese))
[11] 崔 峰，来兴平，曹建涛，等. 煤体耦合致裂后整体–散体的等效转化及其垮放能力评估[J]. 岩石力学与工程学报，2015，34(3)：565–571.(CUI Feng，LAI Xingping，CAO Jiantao，et al. Intact-loose medium equivalent transformation after coupled cracking and assessment of caving capability[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(3)：565–571.(in Chinese))
[12] 吴立新，唐春安，钟 声，等. 非连续断层破裂红外辐射与声发射、应力场的对比研究[J]. 岩石力学与工程学报，2006，25(6)：1 111– 1 117.(WU Lixin，TANG Chun?an，ZHONG Sheng，et al. Comparison of thermal infrared radiation from discontinuous jointed faults fracturing with its acoustic emission and stress field[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(6)：1 111– 1 117.(in Chinese))
[13] 刘善军，吴立新，王川婴，等. 遥感–岩石力学(VIII)—论岩石破裂的热红外前兆[J]. 岩石力学与工程学报，2004，23(10)：1 621–1 627.(LIU Shanjun，WU Lixin，WANG Chuanying，et al. Remote sensing-rock mechanics(VIII)—Tiromens of rock fracturing[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(10)：1 621–1 627. (in Chinese))
[14] 吴立新，刘善军，吴育华，等. 遥感–岩石力学(IV)—岩石压剪破裂的热红外辐射规律及其地震前兆意义[J]. 岩石力学与工程学报，2004，23(4)：539–544.(WU Lixin，LIU Shanjun，WU Yuhua，et al. Remote sensing-rock mechanics(IV)—Laws of thermal infrared radiation from compressively-sheared fracturing of rock and its meanings for earthquake omens[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(4)：539–544.(in Chinese))
[15] 刘善军，吴立新，王金庄，等. 遥感–岩石力学(VI)—岩石摩擦滑移特征及其影响因素分析[J].岩石力学与工程学报，2004，23(8)： 1 247–1 251.(LIU Shanjun，WU Lixin，WANG Jinzhuang，et al. Remote sensing-rock mechanics(VI)—Features of rock friction-sliding and analysis on its influence factors[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(8)：1 247–1 251.(in Chinese)) |
|
|
|
2015, Vol. 34 
