煤矿井下应力场类型及相互作用分析
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摘要
基于原岩应力场与采动应力场,提出支护应力场的概念,即支护在围岩中产生的应力场与在支护体内部产生的应力场,并指出3种应力场构成了煤矿井下综合应力场.在井下实测数据的基础上,研究了煤矿井下原岩应力,特别是构造应力的分布特征;采用数值模拟方法,分析了掘进工作面、巷道及采煤工作面周围应力分布特征与规律,采动集中应力的大小;计算了预应力锚杆支护、单体液压支柱及金属支架在围岩中产生的应力场.分析计算了锚杆杆体、托板及钢带等支护构件中的应力大小与分布特征,并对比分析了原岩应力、采动应力及支护应力的量值.论述了原岩应力场对采动应力场的影响,以及采动应力场与支护应力场的相互作用与关系.
The concept of supporting stress fields was put forward on the basis of in-situ and mining stress fields,which are the stress fields in surrounding rock caused by supports and the stress fields in the supports.The three types of stress fields consist of comprehensive stress field in underground coal mines.Based on the underground measurement data,the distribution characteristics of in-situ stresses,especially tectonic stresses were analyzed;the stress distribution features and laws,the magnitude of stress concentration around heading face and working face were analyzed by means of numerical simulation;the stress fields in surrounding rock caused by pretensioned bolting,individual hydraulic props and steel arches were computed.The stress magnitude and distribution features in bolt bar,plate and steel strap were computed in contrast to the magnitudes of in-situ stresses,mining stresses and supporting stresses.The affects of in-situ stresses to mining stresses,and the interaction and relation between mining and supporting stress fields were discussed.
The concept of supporting stress fields was put forward on the basis of in-situ and mining stress fields,which are the stress fields in surrounding rock caused by supports and the stress fields in the supports.The three types of stress fields consist of comprehensive stress field in underground coal mines.Based on the underground measurement data,the distribution characteristics of in-situ stresses,especially tectonic stresses were analyzed;the stress distribution features and laws,the magnitude of stress concentration around heading face and working face were analyzed by means of numerical simulation;the stress fields in surrounding rock caused by pretensioned bolting,individual hydraulic props and steel arches were computed.The stress magnitude and distribution features in bolt bar,plate and steel strap were computed in contrast to the magnitudes of in-situ stresses,mining stresses and supporting stresses.The affects of in-situ stresses to mining stresses,and the interaction and relation between mining and supporting stress fields were discussed.
引文
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[12]姜铁明.煤巷锚杆支护构件的作用机理及其在晋城矿区的应用研究[D].北京:中国矿业大学(北京),2008.Jiang Tieming.Study on action mechanism of rock bolting components in coal roadways and its applications in Jincheng coalmining area[D].Beijing:China University of Mining and Technology(Beijing),2008.
[13]李建波.钢带的力学性能与支护作用研究[D].北京:煤炭科学研究总院,2008.Li Jianbo.Study on mechanical property and support function of steel strip[D].Beijing:China Coal Research Institute,2008.
[2]吴继敏.工程地质学[M].北京:高等教育出版社,2006.Wu Jimin.Engineering geology[M].Beijing:Higher Education Press,2006.
[3]康红普,林健.我国巷道围岩地质力学测试技术新进展[J].煤炭科学技术,2001,29(7):27-30.Kang Hongpu,Lin Jian.New development in geomechanics measurement and test technology of mine roadway surroundingrock[J].Coal Science and Technology,2001,29(7):27-30.
[4]康红普,王金华.煤巷锚杆支护理论与成套技术[M].北京:煤炭工业出版社,2007:36-51.Kang Hongpu,Wang Jinhua.Rock bolting theory and complete technology for coal roadways[M].Beijing:China Coal In-dustry Publishing House,2007:36-51.
[5]康红普,林健,张晓.深部矿井地应力测量方法研究与应用[J].岩石力学与工程学报,2007,26(5):929-933.Kang Hongpu,Lin Jian,Zhang Xiao.Research and application of in-situ stress measurement in deep mines[J].ChineseJournal of Rock Mechanics and Engineering,2007,26(5):929-933.
[6]朱焕春,陶振宇.不同岩石中地应力分布[J].地震学报,1994,16(1):49-63.Zhu Huanchun,Tao Zhenyu.Geostress distributions in different rock[J].Acta Seismologica Sinica,1994,16(1):49-63.
[7]赵德安,陈志敏,蔡小林,等.中国地应力场分布规律统计分析[J].岩石力学与工程学报,2007,26(6):1 265-1 271.Zhao Dean,Chen Zhimin,Cai Xiaolin,et al.Analysis of distribution rule of geostress in China[J].Chinese Journal of RockMechanics and Engineering,2007,26(6):1 265-1 271.
[8]王胜本,张晓.煤矿井下地质构造与地应力的关系[J].煤炭学报,2008,33(7):738-742.Wang Shengben,Zhang Xiao.Relation between geological structures and in-situ stresses in underground coal mines[J].Journal of China Coal Society,2008,33(7):738-742.
[9]康红普,姜铁明,高富强.预应力在锚杆支护中的作用[J].煤炭学报,2007,32(7):673-678.Kang Hongpu,Jiang Tieming,Gao Fuqiang.Effect of pretensioned stress to rock bolting[J].Journal of China Coal Society,2007,32(7):673-678.
[10]王金华,康红普,高富强.锚索支护传力机制与应力分布的数值模拟[J].煤炭学报,2008,33(1):1-6.Wang Jinhua,Kang Hongpu,Gao Fuqiang.Numerical simulition study on load-transfer mechanisms and stress distributioncharacteristics of cable bolts[J].Journal of China Coal Society,2008,33(1):1-6.
[11]康红普,姜铁明,高富强.预应力锚杆支护参数的设计[J].煤炭学报,2008,33(7):721-726.Kang Hongpu,Jiang Tieming,Gao Fuqiang.Design for pretensioned rock bolting parameters[J].Journal of China Coal So-ciety,2008,33(7):721-726.
[12]姜铁明.煤巷锚杆支护构件的作用机理及其在晋城矿区的应用研究[D].北京:中国矿业大学(北京),2008.Jiang Tieming.Study on action mechanism of rock bolting components in coal roadways and its applications in Jincheng coalmining area[D].Beijing:China University of Mining and Technology(Beijing),2008.
[13]李建波.钢带的力学性能与支护作用研究[D].北京:煤炭科学研究总院,2008.Li Jianbo.Study on mechanical property and support function of steel strip[D].Beijing:China Coal Research Institute,2008.
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