不同冲击倾向性型煤的制取及其力学指标测定
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摘要
利用岩石三轴试验机在不同成型压力下制取得到具有不同冲击倾向性的型煤。为了验证型煤的冲击倾向性,对所制得型煤进行了单轴压缩试验,引入考虑时间效应的冲击能量速度指标W_(ST)对制取的型煤进行冲击倾向性判别。结果表明,依据冲击能量速度指标W_(ST)判别型煤的冲击倾向性简便、快捷且具有更高的可靠度;成型压力对型煤冲击倾向性影响较大,依据现有配比得出70 MPa与90 MPa成型压力下制得的型煤不具有冲击倾向性,而100 MPa及120 MPa成型压力下制得的型煤具有中等冲击倾向性,研究结论可为后期冲击-突出复合型动力灾害的相似模拟提供借鉴。
Various coal samples with different burst liability were prepared by the rock triaxial compression tests with diverse stresses. Then the uniaxial compression tests were applied to verify the burst liability of the coal samples. Therefore, the burst energy velocity index W_(ST) which considered the time effects is applied for the burst liability estimation for the briquette samples. The results indicate that the estimation of the burst liability for the briquette samples can be easily and promptly accomplished by the W_(ST) index, and the estimation results are more reliable. The effects from the compaction to the burst liability to the briquette samples are greater than the raw coal samples.Considering the current mixing ratio of the briquette samples, the samples does not show a burst liability in the stress of 70 MPa and 90 MPa. While in the stress of 100 MPa and 120 MPa, the briquette samples show a medium strength of the burst liability. The research results can provide a theoretical foundation for the further experiments of bumping-outburst compound dynamic hazards simulation.
Various coal samples with different burst liability were prepared by the rock triaxial compression tests with diverse stresses. Then the uniaxial compression tests were applied to verify the burst liability of the coal samples. Therefore, the burst energy velocity index W_(ST) which considered the time effects is applied for the burst liability estimation for the briquette samples. The results indicate that the estimation of the burst liability for the briquette samples can be easily and promptly accomplished by the W_(ST) index, and the estimation results are more reliable. The effects from the compaction to the burst liability to the briquette samples are greater than the raw coal samples.Considering the current mixing ratio of the briquette samples, the samples does not show a burst liability in the stress of 70 MPa and 90 MPa. While in the stress of 100 MPa and 120 MPa, the briquette samples show a medium strength of the burst liability. The research results can provide a theoretical foundation for the further experiments of bumping-outburst compound dynamic hazards simulation.
引文
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[13]潘一山,耿琳,李忠华.煤层冲击倾向性与危险性评价指标研究[J].煤炭学报,2010,35(12):1 975-1 978.
[2]宋录生,赵善坤,刘军,等.“顶板-煤层”结构体冲击倾向性演化规律及力学特性试验研究[J].煤炭学报,2014,39(S1):23-30.
[3]许江,叶桂兵,李波波,等.不同黏结剂配比条件下型煤力学及渗透特性试验研究[J].岩土力学,2015,36(1):104-110.
[4]田斌,许德平,杨芳芳,等.成型压力与粉煤粒度分布对冷压型煤性能的影响[J].煤炭科学技术,2013,41(10):125-128.
[5]孙朋,戴林超,贾泉敏,等.冷压型煤强度影响因素的研究现状及展望[J].矿业安全与环保,2015,42(6):100-104.
[6]邓加耀,张会强,吴坚,等.粒度、压力和水分对型煤冷态强度的影响[J].工程热物理学报,2004(S1):182-184.
[7]齐庆新,彭永伟,李宏艳,等.煤岩冲击倾向性研究[J].岩石力学与工程学报,2011,30(S1):2 736-2 742.
[8]王越,白向飞,王东升.型煤中裂隙控制因素的试验研究[J].煤炭科学技术,2014,42(S1):297-299,303.
[9]曹树刚,李勇,郭平,等.型煤与原煤全应力–应变过程渗流特性对比研究[J].岩石力学与工程学报,2010,29(5):899-906.
[10]赵巍,李远才,万鹏,等.影响型煤成型质量的工艺参数研究[J].煤炭科学技术,2012,40(6):121-124.
[11]赵同彬,尹延春,谭云亮,等.基于颗粒流理论的煤岩冲击倾向性细观模拟试验研究[J].煤炭学报,2014,39(2):280-285.
[12]苏承东,高保彬,袁瑞甫,等.平顶山矿区煤层冲击倾向性指标及关联性分析[J].煤炭学报,2014,39(S1):8-14.
[13]潘一山,耿琳,李忠华.煤层冲击倾向性与危险性评价指标研究[J].煤炭学报,2010,35(12):1 975-1 978.