破碎煤体点载荷强度测试及单轴抗压强度预测分析
|
摘要
针对破碎煤体获取标准煤样困难,无法直接获得其单轴抗压强度,采用点载荷仪对现场取得圆柱体和不规则2种形式的破碎煤块进行实验室点载荷强度测试,通过数理统计方法对30组测试数据拟合分析,得出煤块点载荷强度指数分布规律以及与等效直径的关系,同时结合以往单轴抗压强度与点载荷强度指数公式及适用范围,获得新元煤矿破碎煤体单轴抗压强度。研究结果表明:煤块点载荷强度指数遵循Weibull分布,随着块体大小变化其分布形式无显著差别。对点载荷测试数据聚类分析,点载荷强度指数与等效直径成反比。通过分析单轴抗压强度与点载荷强度指数关系,得出新元煤矿巷帮破碎区煤体单轴抗压强度处于0.7～4.9 MPa。研究破碎煤体点载荷强度测试以及定量估计其单轴抗压强度,对破碎煤体巷道围岩支护提供依据具有重要意义。
It is difficult to obtain the standard coal samples for the fragile coal samples,and the uniaxial compressive strength cannot be measured directly.The point load meter is used to test the laboratory point load strength of the broken coal in the form of cylinder and irregularity,and the 30 sets of test data are analyzed by mathematical statistics method. The distribution law of coal block point load strength index and its relationship with equivalent diameter were obtained. At the same time,combined with the previous uniaxial compressive strength and point load strength index formulas and its applicable scope,the uniaxial compression strength of fragile coal body in Xinyuan Coal Mine was obtained. The results show that the coal load intensity index follows the Weibull Distribution,and there is no significant difference in the shape distribution with the block size.For the point load test data clustering analysis,the point load intensity index is inversely proportional to the equivalent diameter. By establishing the relationship between uniaxial compressive strength and point load strength index,it is concluded that the uniaxial compressive strength of the coal body in the broken area of Xinyuan Coal Mine is 0.7 ～ 4.9 MPa. It is of great significance to study the load strength test of fragile coal body and quantitatively estimate its uniaxial compressive strength,which provides a basis for surrounding rock support of broken coal roadway.
It is difficult to obtain the standard coal samples for the fragile coal samples,and the uniaxial compressive strength cannot be measured directly.The point load meter is used to test the laboratory point load strength of the broken coal in the form of cylinder and irregularity,and the 30 sets of test data are analyzed by mathematical statistics method. The distribution law of coal block point load strength index and its relationship with equivalent diameter were obtained. At the same time,combined with the previous uniaxial compressive strength and point load strength index formulas and its applicable scope,the uniaxial compression strength of fragile coal body in Xinyuan Coal Mine was obtained. The results show that the coal load intensity index follows the Weibull Distribution,and there is no significant difference in the shape distribution with the block size.For the point load test data clustering analysis,the point load intensity index is inversely proportional to the equivalent diameter. By establishing the relationship between uniaxial compressive strength and point load strength index,it is concluded that the uniaxial compressive strength of the coal body in the broken area of Xinyuan Coal Mine is 0.7 ～ 4.9 MPa. It is of great significance to study the load strength test of fragile coal body and quantitatively estimate its uniaxial compressive strength,which provides a basis for surrounding rock support of broken coal roadway.
引文
[1]康红普.煤岩体地质力学原位测试及在围岩控制中的应用[M].北京:科学出版社,2013:174-212.
[2]中华人民共和国建设部.中华人民共和国国家标准:工程岩体分级标准[M].北京:中国计划出版社,1995.
[3]康红普,司林坡.深部矿区煤岩体强度测试与分析[J].岩石力学与工程学报,2009,28(7):1312-1320.KANG Hongpu,SI Linpo.Test and analysis of coal and rock mass strength in deep coal mine[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(7):1312-1320.
[4]王琦,秦乾,高松,等.数字钻探随钻参数与岩石单轴抗压强度关系[J].煤炭学报,2018,43(5):1289-1295.WANG Qi,QIN Qian,GAO Song,et al.Relationship between rock drilling parameters and rock uniaxial compressive strength based on energy analysis[J].Journal of coal science,2018,43(5):1289-1295.
[5]FRANKLIN J A.Suggested method for determining point load strength[J].International Journal of Rock Mechanics&Mining Sciences&Geomechanics Abstracts,1985,22(2):51-60.
[6]刘泉声,赵怡凡,张晓平,等.灰岩隧道掘进机隧道点荷载试验评价岩石强度方法的研究与探讨[J].岩土力学,2018,39(3):977-984.LIU Quansheng,ZHAO Yifan,ZHANG Xiaoping,et al.Study and discussion on point load test for evaluating rock strength of TBMtunnel constructed in limestone[J].Rock and Soil Mechanics,2018,39(3):977-984.
[7]KAHRAMAN S.The determination of uniaxial compressive strength from point load strength for pyroclastic rocks[J].Engineering Geology,2014,170(4):33-42.
[8]RUSNAK J,MARK C.Using the point load test to determine the uniaxial compressive strength of coal measure rock[C].Proceedings of the 19th international conference on ground control in mining.Morgantown:West Virginia University,2000:362-371.
[9]KOOHMISHI M,PALASSI M.Evaluation of the strength of railway ballast using point load test for various size fractions and particle shapes[J].Rock Mechanics and Rock Engineering,2016,49(7):2655-2664.
[10]张国锋,刘志双,陈显坤,等.点荷载法测试易风化泥质岩强度的可靠性分析[J].岩土力学,2014,35(S1):292-298.ZHANG Guofeng,LIU Zhishuang,CHEN Xiankun,et al.Reliability analysis of measuring strongly weathered grey mudstone strength with point load measurement[J].Rock and Soil Mechanics,2014,35(S1):292-298.
[11]王茹,唐春安,王述红.岩石点荷载试验若干问题的研究[J].东北大学学报(自然科学版),2008,29(1):130-132.WANG Ru,TANG Chunan,WANG Shuhong,Study on several problems about point load test of rock[J].Journal of Northeastern University(Natural Science),2008,29(1):130-132.
[12]SINGH T N,KAINTHOLA A,VENKATESH A.Correlation between point load index and uniaxial compressive strength for different rock types[J].Rock Mechanics and Rock Engineering,2012,45(2):259-264.
[13]郭曼丽.试论岩石点荷载试验的适用性[J].岩土力学,2003,24(3):488-490.GUO Manli.Discussion on adaptability of point load test of rocks,[J].Rock and Soil Mechanics,2003,24(3):488-490.
[14]TZIALLAS G P,TSIAMBAOS G,SAROGLOU H.Determination of rock strength and deformability of intact rocks[J].Electronic Journal of Geotechnical Engineering,2009,14(7):1-12.
[15]付志亮,王亮.煤层顶底板岩石点荷载强度与拉压强度对比试验研究[J].岩石力学与工程学报,2013,32(1):88-96.FU Zhiliang,WANG liang.Comparative experimental research on point load strength,uniaxial compressive strength and tensile strength for rocks in roof and floor of coal seam[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(1):88-96.
[16]金良琼.两参数Weibull分布的参数估计[D].昆明:云南大学,2010.
[17]王伟.Kmeans聚类与多波谱阈值相结合的云检测和烟检测算法研究[D].合肥:中国科学技术大学,2011.
[18]VALLEJO L E,WELSH R A,Robinson M K.Correlation between unconfined compressive and point load strengths for Appalachian rocks[C].The 30th US Symposium on Rock Mechanics(US-RMS).Morgantown:Rock Mechanics Association,1989:461-468.
[19]CHAU K T,WONG R H C.Uniaxial compressive strength and point load strength of rocks[J].International Journal of Rock Mechanics&Mining Sciences&Geomechanics Abstracts,1996,33(2):183-188.
[20]QUANE S L,RUSSELL J K.Rock strength as a metric of welding intensity in pyroclastic deposits[J].European Journal of Mineralogy,2003,15(5):855-864.
[21]TSIAMBAOS G,SABATAKAKIS N.Considerations on strength of intact sedimentary rocks[J].Engineering Geology,2004,72(3/4):261-273.
[22]SANTI P M.Field Methods for Characterizing Weak Rock for Engineering[J].Environmental&Engineering Geoscience,2006,12(1):1-11.
[23]KASSIM A,MOHAMMAD E T.Laboratory study of weathered rock for surface excavation works[D].Johor:Universiti Teknologi Malaysia,2007.
[24]SABATAKAKIS N,KOUKIS G,TSIAMBAOS G,et al.Index properties and strength variation controlled by microstructure for sedimentary rocks[J].Engineering Geology,2008,97(1):80-90.
[25]BASU A,KAMRAN M.Point load test on schistose rocks and its applicability in predicting uniaxial compressive strength[J].International Journal of Rock Mechanics&Mining Sciences,2010,47(5):823-828.
[26]LI D,WONG L N Y.Reply to Comment by Saffet Yagiz on“Point Load Test on Meta-Sedimentary Rocks and Correlations to UCSand BTS”[J].Rock Mechanics and Rock Engineering,2013,46(4):913-915.
[2]中华人民共和国建设部.中华人民共和国国家标准:工程岩体分级标准[M].北京:中国计划出版社,1995.
[3]康红普,司林坡.深部矿区煤岩体强度测试与分析[J].岩石力学与工程学报,2009,28(7):1312-1320.KANG Hongpu,SI Linpo.Test and analysis of coal and rock mass strength in deep coal mine[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(7):1312-1320.
[4]王琦,秦乾,高松,等.数字钻探随钻参数与岩石单轴抗压强度关系[J].煤炭学报,2018,43(5):1289-1295.WANG Qi,QIN Qian,GAO Song,et al.Relationship between rock drilling parameters and rock uniaxial compressive strength based on energy analysis[J].Journal of coal science,2018,43(5):1289-1295.
[5]FRANKLIN J A.Suggested method for determining point load strength[J].International Journal of Rock Mechanics&Mining Sciences&Geomechanics Abstracts,1985,22(2):51-60.
[6]刘泉声,赵怡凡,张晓平,等.灰岩隧道掘进机隧道点荷载试验评价岩石强度方法的研究与探讨[J].岩土力学,2018,39(3):977-984.LIU Quansheng,ZHAO Yifan,ZHANG Xiaoping,et al.Study and discussion on point load test for evaluating rock strength of TBMtunnel constructed in limestone[J].Rock and Soil Mechanics,2018,39(3):977-984.
[7]KAHRAMAN S.The determination of uniaxial compressive strength from point load strength for pyroclastic rocks[J].Engineering Geology,2014,170(4):33-42.
[8]RUSNAK J,MARK C.Using the point load test to determine the uniaxial compressive strength of coal measure rock[C].Proceedings of the 19th international conference on ground control in mining.Morgantown:West Virginia University,2000:362-371.
[9]KOOHMISHI M,PALASSI M.Evaluation of the strength of railway ballast using point load test for various size fractions and particle shapes[J].Rock Mechanics and Rock Engineering,2016,49(7):2655-2664.
[10]张国锋,刘志双,陈显坤,等.点荷载法测试易风化泥质岩强度的可靠性分析[J].岩土力学,2014,35(S1):292-298.ZHANG Guofeng,LIU Zhishuang,CHEN Xiankun,et al.Reliability analysis of measuring strongly weathered grey mudstone strength with point load measurement[J].Rock and Soil Mechanics,2014,35(S1):292-298.
[11]王茹,唐春安,王述红.岩石点荷载试验若干问题的研究[J].东北大学学报(自然科学版),2008,29(1):130-132.WANG Ru,TANG Chunan,WANG Shuhong,Study on several problems about point load test of rock[J].Journal of Northeastern University(Natural Science),2008,29(1):130-132.
[12]SINGH T N,KAINTHOLA A,VENKATESH A.Correlation between point load index and uniaxial compressive strength for different rock types[J].Rock Mechanics and Rock Engineering,2012,45(2):259-264.
[13]郭曼丽.试论岩石点荷载试验的适用性[J].岩土力学,2003,24(3):488-490.GUO Manli.Discussion on adaptability of point load test of rocks,[J].Rock and Soil Mechanics,2003,24(3):488-490.
[14]TZIALLAS G P,TSIAMBAOS G,SAROGLOU H.Determination of rock strength and deformability of intact rocks[J].Electronic Journal of Geotechnical Engineering,2009,14(7):1-12.
[15]付志亮,王亮.煤层顶底板岩石点荷载强度与拉压强度对比试验研究[J].岩石力学与工程学报,2013,32(1):88-96.FU Zhiliang,WANG liang.Comparative experimental research on point load strength,uniaxial compressive strength and tensile strength for rocks in roof and floor of coal seam[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(1):88-96.
[16]金良琼.两参数Weibull分布的参数估计[D].昆明:云南大学,2010.
[17]王伟.Kmeans聚类与多波谱阈值相结合的云检测和烟检测算法研究[D].合肥:中国科学技术大学,2011.
[18]VALLEJO L E,WELSH R A,Robinson M K.Correlation between unconfined compressive and point load strengths for Appalachian rocks[C].The 30th US Symposium on Rock Mechanics(US-RMS).Morgantown:Rock Mechanics Association,1989:461-468.
[19]CHAU K T,WONG R H C.Uniaxial compressive strength and point load strength of rocks[J].International Journal of Rock Mechanics&Mining Sciences&Geomechanics Abstracts,1996,33(2):183-188.
[20]QUANE S L,RUSSELL J K.Rock strength as a metric of welding intensity in pyroclastic deposits[J].European Journal of Mineralogy,2003,15(5):855-864.
[21]TSIAMBAOS G,SABATAKAKIS N.Considerations on strength of intact sedimentary rocks[J].Engineering Geology,2004,72(3/4):261-273.
[22]SANTI P M.Field Methods for Characterizing Weak Rock for Engineering[J].Environmental&Engineering Geoscience,2006,12(1):1-11.
[23]KASSIM A,MOHAMMAD E T.Laboratory study of weathered rock for surface excavation works[D].Johor:Universiti Teknologi Malaysia,2007.
[24]SABATAKAKIS N,KOUKIS G,TSIAMBAOS G,et al.Index properties and strength variation controlled by microstructure for sedimentary rocks[J].Engineering Geology,2008,97(1):80-90.
[25]BASU A,KAMRAN M.Point load test on schistose rocks and its applicability in predicting uniaxial compressive strength[J].International Journal of Rock Mechanics&Mining Sciences,2010,47(5):823-828.
[26]LI D,WONG L N Y.Reply to Comment by Saffet Yagiz on“Point Load Test on Meta-Sedimentary Rocks and Correlations to UCSand BTS”[J].Rock Mechanics and Rock Engineering,2013,46(4):913-915.