开采扰动区(EDZ)内层状围岩变尺度损伤及失稳预计实验及综合分析
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摘要
在地下开采中常遇到层裂影响围岩力学行为,考虑到安全支护载荷及衍生动力灾害的可能性及工程应用,基于现场工程调查和室内多尺度煤岩动力破坏规律实验观察,建立了物理相似模型,完成了基于声发射(AE)的采空区覆岩变尺度损伤与断裂的模拟实验,对开采扰动区工作面周期来压(4个阶段)、围岩破裂与损伤的声发射特征参数(总事件与能率以及隐含的临界敏感性)等多元信息进行了综合比较,获得了老顶来压强度及支护阻力的定量化指标,这为工程现场EDZ内顶板大范围破断、围岩稳定性、破碎岩体失稳垮落等监测与控制提供依据。
Rock mass mechanical behavior dominated by laminations is encountered in underground excavations.Safe considerations for the support-force and its derived dynamic hazard probability or engineering application,it is important for the inherent stability of regularity and precursors.Based on the engineering,field investigation and coherent multiple-scales experiment observations and their regularity analysis,the physical models had been constructed for coal/rock mass damage and fracture in terms of AE test.The four stages periodic pressure variation at working-face,stability of EDZ,rock mass damage and fracture AE characteristic parameters,total event,energy release and its critical sensitivity,etc.,had been compared and analyzed,and the quantitative index of rock mass behavior and key roof workforce had been obtained.This provides monitoring way and field safe considerations for large roof rock mass damage,destabilization and collapse for broken rocks and its stability evaluation in EDZ.
Rock mass mechanical behavior dominated by laminations is encountered in underground excavations.Safe considerations for the support-force and its derived dynamic hazard probability or engineering application,it is important for the inherent stability of regularity and precursors.Based on the engineering,field investigation and coherent multiple-scales experiment observations and their regularity analysis,the physical models had been constructed for coal/rock mass damage and fracture in terms of AE test.The four stages periodic pressure variation at working-face,stability of EDZ,rock mass damage and fracture AE characteristic parameters,total event,energy release and its critical sensitivity,etc.,had been compared and analyzed,and the quantitative index of rock mass behavior and key roof workforce had been obtained.This provides monitoring way and field safe considerations for large roof rock mass damage,destabilization and collapse for broken rocks and its stability evaluation in EDZ.
引文
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[11]来兴平,黄昌富,蔡美峰.采空区动力灾害监测的非平衡信号的子波变换分析[J].西安科技学院学报,2003,23(3):237-240.
[12]来兴平,张海燕,刘叶玲,等.支持向量机在煤岩破裂失稳声发射定位实验中的应用[J].金属矿山,2006.
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[14]西安科技大学,中国神华能源股份有限公司神东煤炭分公司,教育部西部矿井开采与灾害治理重点实验室.大柳塔煤6 m厚煤层一次采全厚开采方法及“支架-围岩”双馈动力学研究(研究报告)[R].西安:西安科技大学,2005.
[15]来兴平,张勇,奚家米,等.基于AE煤岩破裂与动态失稳特征实验及综合分析[J].西安科技大学学报,2006,26(3):289-292.
[2]夏蒙棼,韩闻生,柯孚久,等.统计细观损伤力学和损伤演化诱致突变[J].力学进展,1995,25(1):1.
[3]谢和平,彭瑞东,周宏伟,等.基于断裂力学与损伤力学的岩石强度理论研究进展[J].自然科学进展,2004,14(10):1086.
[4]来兴平.开采扰动下大尺度采空区衍生动力灾害控制研究[R].北京:北京科技大学博士后报告,2004.
[5]Mogi K.Study of elastic shocks caused by the fracture of heterogeneous m aterials and its relation to earthquake phenom ena[Z].Bu ll Earthq.Res.Inst,1962,40:125-173.
[6]Mogi K.Source location of elastic shocks in the fracturing process in rock[J].Bu ll Earthq.Res.Inst,1968,46:1103-1125.
[7]唐春安.岩石破裂过程中的灾变[M].北京:煤炭工业出版社,1993.
[8]Lai X P,CaiM F,X ieM W.In situ mon itoring and analysis of rock m ass behavior prior to collapse of the m ain transport road-way in L inglong Gold M ine[J].Ch ina.Int.J.Rock M ech.&M in.Sc i.,2006,43(4):640.
[9]X ingp ing Lai,M e ifeng Cai.Coup le analyzing the acoustic em ission characters from hard composite rock fracture[J].JournalofUn iversity of Sc ience and Technology Be ijing,2004,11(2):97.
[10]来兴平,蔡美峰.岩石基复合材料支护采空区动力失稳声发射特征统计分析[J].岩土工程学报,2003,25(1):51.
[11]来兴平,黄昌富,蔡美峰.采空区动力灾害监测的非平衡信号的子波变换分析[J].西安科技学院学报,2003,23(3):237-240.
[12]来兴平,张海燕,刘叶玲,等.支持向量机在煤岩破裂失稳声发射定位实验中的应用[J].金属矿山,2006.
[13]余怀忠,尹祥础,张永仙,等.态矢量的实验研究[J].地震,2004,24(3):1-7.
[14]西安科技大学,中国神华能源股份有限公司神东煤炭分公司,教育部西部矿井开采与灾害治理重点实验室.大柳塔煤6 m厚煤层一次采全厚开采方法及“支架-围岩”双馈动力学研究(研究报告)[R].西安:西安科技大学,2005.
[15]来兴平,张勇,奚家米,等.基于AE煤岩破裂与动态失稳特征实验及综合分析[J].西安科技大学学报,2006,26(3):289-292.
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