胶结充填体水化温度场特征及对煤自燃特性的影响
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摘要
为了防止胶结充填开采中充填体凝固过程放热引起相邻煤体自燃风险,分别进行了井下充填体温度场实测和煤自燃指标气体试验。在风积砂似膏体连采充填工作面支巷1 386 m~3充填体内部、与外部交界面及相邻煤体不同位置设置了16个测点,进行了为期50 d的充填体水化温度场监测,结果表明:温度变化分为"快速上升"、"较快下降"和"缓慢下降"3个阶段,94~98 h内部温度达到峰值63.5~64.4℃,水化温度持续时间约30 d;相邻煤体受水化热影响深度约0.5 m。实验室自燃指标气体(CO、C_2H_4和C_3H_8)试验表明,受充填体水化热影响的煤样指标气体生成的初始温度低于常规煤样,且相同温度下前者指标气体浓度大于后者,表明前者更容易自燃。研究表明胶结充填采空区煤体自燃风险不容忽视。
In order to prevent the spontaneous combustion risk of adjacent coal bodies during solidification process of filling body in cemented backfill mining,a site measurement of the temperature field as well as the index gas test of the coal spontaneous combustion were individually conducted. There were 16 measuring points set in different locations,as the 1 386 m~3 backfilled mass of the branch gateway in the aeolian sand paste-like backfill continuous mining face,the interfaces connected with the external and the neighboring seam. A 50 days monitoring and measurement was conducted on the hydrated temperature filed of the backfill mass. The results showed that the temperature variation could be divided into three stages,including "a rapid rising","quick declining"and "gently declining". After 94 ~ 98 h,the internal temperature would reach the peak value of 63. 5 ~ 64. 4 ℃. The hydrated temperature lasted time would be about 30 days. The depth of the neighbor seam affected by the hydration heat was about 0.5 m. The lab test of the spontaneous combustion index gas( CO,C_2H_4 and C_3H_8) showed that,affected by the hydrated heat of the backfill mass,the initial temperature generated from the index gas of the coal samples would be lower than the conventional coal samples. Under the same temperature,the index gas concentration of the coal sample affected by the hydrated heat would be higher than the conventional coal samples,and this indicates that the coal sample affected the hydrated heat would be easy to be spontaneously combusted. The research showed that,the spontaneous combustion risk of the coal in the cemented backfill goaf could not be ignored.
In order to prevent the spontaneous combustion risk of adjacent coal bodies during solidification process of filling body in cemented backfill mining,a site measurement of the temperature field as well as the index gas test of the coal spontaneous combustion were individually conducted. There were 16 measuring points set in different locations,as the 1 386 m~3 backfilled mass of the branch gateway in the aeolian sand paste-like backfill continuous mining face,the interfaces connected with the external and the neighboring seam. A 50 days monitoring and measurement was conducted on the hydrated temperature filed of the backfill mass. The results showed that the temperature variation could be divided into three stages,including "a rapid rising","quick declining"and "gently declining". After 94 ~ 98 h,the internal temperature would reach the peak value of 63. 5 ~ 64. 4 ℃. The hydrated temperature lasted time would be about 30 days. The depth of the neighbor seam affected by the hydration heat was about 0.5 m. The lab test of the spontaneous combustion index gas( CO,C_2H_4 and C_3H_8) showed that,affected by the hydrated heat of the backfill mass,the initial temperature generated from the index gas of the coal samples would be lower than the conventional coal samples. Under the same temperature,the index gas concentration of the coal sample affected by the hydrated heat would be higher than the conventional coal samples,and this indicates that the coal sample affected the hydrated heat would be easy to be spontaneously combusted. The research showed that,the spontaneous combustion risk of the coal in the cemented backfill goaf could not be ignored.
引文
[1]周华强,侯朝炯,孙希奎,等.固体废物膏体充填不迁村采煤[J].中国矿业大学学报,2004,33(2):30-34.ZHOU Huaqiang,HOU Chaojiong,SUN Xikui,et al.Solid waste paste filling forn one-village-relocation coal mining[J].Journal of China University of Mining&Technology,2004,33(2):30-34.
[2]冯光明,孙春东,王成真,等.超高水材料采空区充填方法研究[J].煤炭学报,2010,35(12):1963-1968.FENG Guangming,SUN Chundong,WANG Chengzhen,et al.Research on goaf filling methods with super high-water material[J].Journal of China Coal Society,2010,35(12):1963-1968.
[3]杨宝贵,于跃,匡汉,等.煤矿高浓度胶结充填材料配比优化分析[J].煤炭技术,2015,34(11):1-3.YANG Baogui,YU Yue,KUANG Han,et al.Optimization analysis on ratio of high concentration cementation stowing materials in coal mine[J].Coal Technology,2015,34(11):1-3.
[4]董慧珍,冯国瑞,郭育霞,等.新阳矿充填料浆管道输送特性的试验研究[J].采矿与安全工程学报,2013,30(6):880-885.DONG Huizhen,FENG Guorui,GUO Yuxia,et al.Pipe transportation characteristics of filling slurry in Xinyang mine[J].Journal of Mining&Safety Engineering,2013,30(6):880-885.
[5]贺桂成,刘永,丁德馨,等.废石胶结充填体强度特性及其应用研究[J].采矿与安全工程学报,2013,30(1):74-79.HE Guicheng,LIU Yong,DING Dexin,et al.Strength characteristic of cemented waste rock backfills and its application[J].Journal of Mining&Safety Engineering,2013,30(1):74-79.
[6]毋林林,康天合,尹博,等.粉煤灰膏体充填材料水化放热特性的微量热测试与分析[J].煤炭学报,2015,40(12):2801-2806.WU Linlin,KANG Tianhe,YIN Bo,et al.Micro calorimetric test and analysis of hydration heat of fly ash paste-filling material[J].Journal of China Coal Society,2015,40(12):2801-2806.
[7]张新国,江宁,江兴元,等.膏体充填开采条带煤柱充填体稳定性监测研究[J].煤炭科学技术,2013,41(2):13-15.ZHANG Xinguo,JIANG Ning,JIANG Xingyuan,et al.Study on backfill body stablity site monitoring during strip coal pillar backfill mining with pastes[J].Coal Science and Technology,2013,41(2):13-15.
[8]毋林林.粉煤灰充填材料的井下安全性研究[D].太原:太原理工大学,2015.
[9]刘鹏亮,孙凯华,尚培.连采工作面胶结充填开采工艺[J].煤炭工程,2014,46(7):52-54.LIU Pengliang,SUN Kaihua,SHANG Pei.Cemented filling mining process applied continuous coal mining face[J].Coal Engineering,2014,46(7):52-54.
[10]孙凯华,刘鹏亮,孙万明,等.风积沙似膏体煤矿充填材料的研究及应用[J].金属矿山,2016(4):172-176.SUN Kaihua,LIU Pengliang,SUN Wanming,et al.Research and application on aeolian sand paste-like stowing material for mine[J].Metal Mine,2016(4):172-176.
[11]马咏真.大体积混凝土施工温度变化规律[J].数学的实践与认识,2011,41(24):77-83.MA Yongzhen.Mass concrete construction temperature change rule[J].Mathematics in Practice and Theory,2011,41(24):77-83.
[12]何文敏,郭建民.大体积混凝土芯部温度监测[J].铁道工程学报,2011(6):64-67,106.He Wenmin,GUO Jianmin.Monitoring and measurement of core temperature of mass concrete[J].Journal of Railway Engineering Society,2011(6):64-67,106.
[13]郭兴明,徐精彩,邓军,等.地温对煤层自燃危险性的影响研究[J].西安交通大学学报,2000,34(11):23-26.GUO Xingming,XU Jingcai,DENG Jun,et al.Research on effect of ground temperature on spontaneous combustion danger of coal seam[J].Journal of Xi’an Jiaotong University,2000,34(11):23-26.
[14]陆伟,李金亮,杨兴兵.采用交叉点温度法对启封煤易复燃问题的研究[J].煤矿安全,2013,44(12):230-233.LU Wei,LI Jinliang,YANG Xingbing.Study on easy spontaneous combustion problem of unsealed coal with crossing point temperature method[J].Safty in Coal Mines,2013,44(12):230-233.
[15]朱令起,周心权,谢建国,等.自然发火标志气体试验分析及优化选择[J].采矿与安全工程学报,2008,25(4):440-443,448.ZHU Lingqi,ZHOU Xinquan,XIE Jianguo,et al.Analysis of indicator gas of spontaneous combustion and its optimal selection[J].Journal of Mining&Safety Engineering,2008,25(4):440-443,448.
[2]冯光明,孙春东,王成真,等.超高水材料采空区充填方法研究[J].煤炭学报,2010,35(12):1963-1968.FENG Guangming,SUN Chundong,WANG Chengzhen,et al.Research on goaf filling methods with super high-water material[J].Journal of China Coal Society,2010,35(12):1963-1968.
[3]杨宝贵,于跃,匡汉,等.煤矿高浓度胶结充填材料配比优化分析[J].煤炭技术,2015,34(11):1-3.YANG Baogui,YU Yue,KUANG Han,et al.Optimization analysis on ratio of high concentration cementation stowing materials in coal mine[J].Coal Technology,2015,34(11):1-3.
[4]董慧珍,冯国瑞,郭育霞,等.新阳矿充填料浆管道输送特性的试验研究[J].采矿与安全工程学报,2013,30(6):880-885.DONG Huizhen,FENG Guorui,GUO Yuxia,et al.Pipe transportation characteristics of filling slurry in Xinyang mine[J].Journal of Mining&Safety Engineering,2013,30(6):880-885.
[5]贺桂成,刘永,丁德馨,等.废石胶结充填体强度特性及其应用研究[J].采矿与安全工程学报,2013,30(1):74-79.HE Guicheng,LIU Yong,DING Dexin,et al.Strength characteristic of cemented waste rock backfills and its application[J].Journal of Mining&Safety Engineering,2013,30(1):74-79.
[6]毋林林,康天合,尹博,等.粉煤灰膏体充填材料水化放热特性的微量热测试与分析[J].煤炭学报,2015,40(12):2801-2806.WU Linlin,KANG Tianhe,YIN Bo,et al.Micro calorimetric test and analysis of hydration heat of fly ash paste-filling material[J].Journal of China Coal Society,2015,40(12):2801-2806.
[7]张新国,江宁,江兴元,等.膏体充填开采条带煤柱充填体稳定性监测研究[J].煤炭科学技术,2013,41(2):13-15.ZHANG Xinguo,JIANG Ning,JIANG Xingyuan,et al.Study on backfill body stablity site monitoring during strip coal pillar backfill mining with pastes[J].Coal Science and Technology,2013,41(2):13-15.
[8]毋林林.粉煤灰充填材料的井下安全性研究[D].太原:太原理工大学,2015.
[9]刘鹏亮,孙凯华,尚培.连采工作面胶结充填开采工艺[J].煤炭工程,2014,46(7):52-54.LIU Pengliang,SUN Kaihua,SHANG Pei.Cemented filling mining process applied continuous coal mining face[J].Coal Engineering,2014,46(7):52-54.
[10]孙凯华,刘鹏亮,孙万明,等.风积沙似膏体煤矿充填材料的研究及应用[J].金属矿山,2016(4):172-176.SUN Kaihua,LIU Pengliang,SUN Wanming,et al.Research and application on aeolian sand paste-like stowing material for mine[J].Metal Mine,2016(4):172-176.
[11]马咏真.大体积混凝土施工温度变化规律[J].数学的实践与认识,2011,41(24):77-83.MA Yongzhen.Mass concrete construction temperature change rule[J].Mathematics in Practice and Theory,2011,41(24):77-83.
[12]何文敏,郭建民.大体积混凝土芯部温度监测[J].铁道工程学报,2011(6):64-67,106.He Wenmin,GUO Jianmin.Monitoring and measurement of core temperature of mass concrete[J].Journal of Railway Engineering Society,2011(6):64-67,106.
[13]郭兴明,徐精彩,邓军,等.地温对煤层自燃危险性的影响研究[J].西安交通大学学报,2000,34(11):23-26.GUO Xingming,XU Jingcai,DENG Jun,et al.Research on effect of ground temperature on spontaneous combustion danger of coal seam[J].Journal of Xi’an Jiaotong University,2000,34(11):23-26.
[14]陆伟,李金亮,杨兴兵.采用交叉点温度法对启封煤易复燃问题的研究[J].煤矿安全,2013,44(12):230-233.LU Wei,LI Jinliang,YANG Xingbing.Study on easy spontaneous combustion problem of unsealed coal with crossing point temperature method[J].Safty in Coal Mines,2013,44(12):230-233.
[15]朱令起,周心权,谢建国,等.自然发火标志气体试验分析及优化选择[J].采矿与安全工程学报,2008,25(4):440-443,448.ZHU Lingqi,ZHOU Xinquan,XIE Jianguo,et al.Analysis of indicator gas of spontaneous combustion and its optimal selection[J].Journal of Mining&Safety Engineering,2008,25(4):440-443,448.