摘要
从刚度耦合方面对液压支架与采场围岩耦合关系进行了研究,给出了液压支架刚度定义并进行了增阻刚度测试,分析了液压支架与煤壁及顶底板刚度耦合关系,建立了相应的耦合方程,修正了现有液压支架支护强度计算公式,将液压支架与采场围岩的耦合关系由目前的定性分析深入到定量研究。结果表明,液压支架增阻刚度主要与立柱刚度有关,液压支架应当与采场围岩条件协调匹配,传统的液压支架支护强度计算是基于煤壁和支架都为刚体的假定前提条件下得出的结论,没有考虑支架刚度、顶板岩性和煤层硬度的耦合作用与影响,计算结果偏低。实践表明,刚度耦合理论能够很好地揭示液压支架与采场围岩的相互作用关系,可以对液压支架设计提供指导。
The paper studied the coupling stiffness relationship between the powered support and the surrounding rock field, defined the stiffness and tested the vertical stiffness of the hydraulic powered support, analyzed the coupling stiffness relationship among the hydraulic powered support, rib, roof and floor. Accordingly, we established corresponding coupled equations and revised the existing calculation formula of support load of powered support, the mining coupling relationship study was progressed from qualitative analysis to quantitative analysis. The result indicates that the vertical stiffness of the powered support, between the set pressure to yield pressure, is mainly decided by the stiffness of leg, which means that the support load of the powered support should be well matched with surrounding rock field characteristics such as coal stiffness and mining height and roof strata stiffness and et al., and the calculation result of supporting density is at a relatively low level by adopting traditional calculation method, because the calculation method is based on the assumption that the coal wall and the powered support are rigid body, without considering the coupling effect and influence among the support stiffness of, the property of roof strata and coal seam hardness. Application results show the coupling theory, which well revealed the relationship between the powered support and surrounding rock field, can provide a guidance for the design of the powered supports. © 2015, China Coal Society. All right reserved.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2015年第11期2528-2533,共6页
Journal of China Coal Society
基金
国家重点基础研究发展计划(973)资助项目(2014CB046302)
国家高技术研究发展计划(863)资助项目(2012AA06A407)
关键词
液压支架
围岩
刚度耦合
协调支护
Coal
Coal deposits
Mine roof control
Rocks
Roofs
Stiffness
