矿岩接触带胶结充填体早期承载特性试验研究
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摘要
为研究胶结充填体早期强度时的矿岩接触带力学作用机理,根据不同充填体情况下的矿房矿柱受力特点简化了相应的力学模型,分析矿岩顶板和矿柱的力学作用机理并进行了相关的模拟实验。选用没有强度的橡皮泥作为早期强度的胶结充填体,通过电阻应变仪对接触带内置电阻应变片和表壁粘贴电阻应变片的应变值进行比较,分析在不断加载过程中接触带及各处的应变变化情况,同时进行数值模拟的相关验证工作。结果表明,在荷载作用下接触带处拉压应力发生突变,挤压造成充填体内部向中心区域挤压。
In order to study the mechanics mechanism of the contact zone of the ore-rock contact zone,the early strength of the cemented backfill was studied. The mechanics model of the ore-bearing pillar was conducted according to the characteristics of the pillar under different filling conditions,and analyzing the mechanics mechanism of the rock roof and pillar. Then the similar simulation experiments were carried out,and the soft crust without strength was used as the early strength cemented filler. The strain gages of the resistance strain gauges and the glued resistance gauges were compared by the resistance strain gage. During the loading process,the change of strain in the contact zone and the location was simulated. At the same time,the correlative verification of the numerical simulation was carried out. It is concluded that the tensile and compressive stresses in the contact zone were abruptly changed by the load,and the inner part of the filling body was squeezed by extrusion.
In order to study the mechanics mechanism of the contact zone of the ore-rock contact zone,the early strength of the cemented backfill was studied. The mechanics model of the ore-bearing pillar was conducted according to the characteristics of the pillar under different filling conditions,and analyzing the mechanics mechanism of the rock roof and pillar. Then the similar simulation experiments were carried out,and the soft crust without strength was used as the early strength cemented filler. The strain gages of the resistance strain gauges and the glued resistance gauges were compared by the resistance strain gage. During the loading process,the change of strain in the contact zone and the location was simulated. At the same time,the correlative verification of the numerical simulation was carried out. It is concluded that the tensile and compressive stresses in the contact zone were abruptly changed by the load,and the inner part of the filling body was squeezed by extrusion.
引文
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[2]田均兵,陈昌礼,邓晓轩,等.高硫尾砂胶结充填试验研究[J].中国矿业,2016,25(4):103-107.
[3]周旭,杨陆海.矿渣粉在煎茶岭镍矿胶结充填中的应用[J].中国矿山工程,2015,44(3):1-5.
[4]林枝祥,杨鹏,吕文生.三山岛金矿盐卤水对胶结充填体早期强度的影响[J].金属矿山,2015(7):164-167.
[5]孙文标,张惠聚,田坤云.似膏体充填体的早期强度及其影响因素研究[J].矿业安全与环保,2009,36(2):7-9.
[6]梁铁成,孙建国,孙章庆.利用橡皮泥制作起伏地表物理模型进行直流电法实验[J].实验技术与管理,2013,30(2):25-28.
[7]窦林.探究橡皮泥的弹性形变实验[J].物理实验,2012,32(8):19-23.