摘要
为深入分析矿柱和充填体的协同作用机制,针对矿山点柱式充填开采工艺,抽象出矿柱—充填体系统模型,并利用FLAC3D数值模拟软件构建其力学模型,从整体和局部的角度综合分析了矿柱和充填体的协同作用关系及其承载机制。研究表明:充填体对矿柱存在4种作用效果,即提高矿柱峰值强度、限制矿柱径向位移、延缓矿柱破坏、加强破坏矿柱承载能力,在充填体作用下,矿柱承载特性改善显著,峰值强度提高了34%;从整体角度上分析,系统在承载过程中,充填体的力学行为表现为总体支护—被动承载—位移约束—共同承载,矿柱成为加载初期主要承载体的本质原因是二者弹性模量的差异;从局部角度上分析,系统中部矿柱和充填体在承载过程中相互作用、相互协助,二者具有明显的协同承载机制,以维持平面整体承载力,此外,在系统高度h=75 mm位置的充填体及矿柱应力状态明显高于h=50 mm位置。上述分析可为矿山分层充填优化设计提供依据。
In order to deeply analyze the co-action mechanism of ore pillar and filling body,aiming at the point-pillar filling mining technology,the system model of ore pillar and filling body was abstracted,and the mechanical model was constructed by using FLAC3Dnumerical simulation software.The co-action relationship and bearing mechanism of ore pillar and filling body were comprehensively analyzed from the whole and local perspectives.The results show that the filling body has four effects on the ore pillar,that is,increase the peak strength of the ore pillar,limit the radial displacement of the ore pillar,delay the failure of the ore pillar and strengthen the bearing capacity of the broken ore pillar.Under the action of the filling body,the bearing characteristics of the ore pillar were significantly improved,and the peak strength was increased by34%.From the perspective of the whole,the mechanical behavior of the filling body in the bearing process of the system was shown as overall support-passive bearing-displacement constraint-joint bearing.The essential reason why the ore pillar becomes the main carrier in the early stage of loading was the difference of elastic modulus between them.From a local point of analysis,in the system,the central ore pillar and filling body interaction,mutual assistance,and in the process of bearing,the load-bearing mechanism has obvious synergism,to keep the whole bearing capacity of the plane,in addition,the stress stat of the filling body and ore pillar at the system height h=75 mm position was significantly higher than that of the system height h=50 mm position.The above analysis can provide reference for the optimizaiton and design of mine stratified filling mining.
作者
洪伟
孙光华
梁世波
HONG Wei;SUN Guanghua;LIANG Shibo(College of Mining Engineering,North China University of Technology,Tangshan 063200,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Hebei Province Key Laboratory of Mining Development and Safety Technique,Tangshan 063200,China;Yisheng Innovation Education Base,North China University of Technology,Tangshan 063200,China)
出处
《金属矿山》
CAS
北大核心
2021年第3期40-45,共6页
Metal Mine
