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金属矿山 ›› 2017, Vol. 46 ›› Issue (07): 60-64.

• 采矿工程 • 上一篇    下一篇

考虑充填体支撑效应的矿岩-充填体相互作用机理分析

王明旭1,2   

  1. 1.武汉科技大学资源与环境工程学院,湖北 武汉,430081;2.冶金矿产资源高效利用与造块湖北省重点实验室,湖北 武汉,430081
  • 出版日期:2017-07-15 发布日期:2017-09-13
  • 基金资助:

    国家自然科学基金项目(编号:51604195)。

Interaction Mechanism of Ore-bearing Rock and Filling Body Based on Considering the Supporting Effects of Filling Body

Wang Mingxu1,2   

  1. 1.School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;2.Key Laboratory of Hubei Province for High-efficient Use of Metallurgical Mineral Resources and Agglomeration,Wuhan 430081,China
  • Online:2017-07-15 Published:2017-09-13

摘要: 为更好地研究矿岩和充填体的相互作用机理,依据充填体的不同硬化时期对顶板和矿岩所处的支撑效应,将充填体分为小变形阶段的弹性变形和大变形阶段的塑性变形,建立相应的充填体与围岩相互作用的悬臂梁+均布荷载及相关约束的力学模型。同时通过配比制作标准圆柱体,待强度稳定后进行切割打磨,在中间掏空20 mm厚度的半圆饼,并用水砂比为1∶12的配料进行充填。通过电阻应变片,测试试样在加载作用下的内部和表壁应变情况,分析接触带处的应力应变变化规律。进一步通过数值模拟软件,模拟相关过程,验证相关试验结果。模拟结果表明:随着加载的进行,接触带的应变变化增幅较大,在没有围压约束、轴向荷载作用情况下,充填体受压从临空面开始产生了剥落现象。围压约束有效增大了接触带区域的安全系数值,局部区域从塑性破坏区变成稳定区。

关键词: 胶结充填, 矿岩, 接触带, 支撑效应

Abstract: In order to better study the interaction mechanism of ore-bearing rock and filling body,according to the supporting effect of roof and ore-bearing rock in different hardening periods of the filling body,the filling body is divided into the elastic deformation in small deformation stage and plastic deformation in large deformation stage.The corresponding mechanical model of cantilever beam + uniform load and related restraints of the interaction of the filling body and the surrounding rock is established.At the same time,the standard cylinder is made based on the ratio,cutting and grinding are conducted after the stability of the filling body strength,the semi-round cake with the thickness of 20 mm is hollowed out in the middle of standard cylinder,and it is filled with the materials with the water and sand ratio of 1∶12.Through the strain gauge,the variation regularities of stress and strain of the contact zone is analyzed by testing the internal and surface wall strain under the loading,besides that,the relevant process is simulated and relevant test results are verified by using numerical simulation software.Simulation results show that with loading,the stain variation increasing amplitude is big,under the condition of no confining pressure,with the action of axial loading,the spalling phenomenon of filling body caused from temporary surface.The safety coefficient in contact zone is increased under the constraint of confining pressure,the local area is transformed from plastic failure zone to stable zone.

Key words: Cemented filling, Ore-bearing rock, Contact zone, Supporting effect