Study of critical thickness of roof of level pillar stoping under multifactor influence

WANG Xiao-jun; FENG Xiao; ZHAO Kui; SHAO Hai; YE Zi-huan

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Study of critical thickness of roof of level pillar stoping under multifactor influence

更新时间：2026-06-25

- Study of critical thickness of roof of level pillar stoping under multifactor influence
- Vol. 34, Issue 12, (2013)
- 作者机构：
  
  1. 江西理工大学资源与环境工程学院,江西,赣州,341000
  2. 中南大学西部矿业博士后科研工作站,西宁,810006
  3. 江西理工大学工程研究院,江西,赣州,341000
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU42
- Online First：19 December 2013，
  
  Published：2013
- 稿件说明：
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WANG Xiao-jun, FENG Xiao, ZHAO Kui, et al. Study of critical thickness of roof of level pillar stoping under multifactor influence[J]. 2013, 34(12).
DOI：

WANG Xiao-jun, FENG Xiao, ZHAO Kui, et al. Study of critical thickness of roof of level pillar stoping under multifactor influence[J]. 2013, 34(12). DOI：

摘要

采用散体充填法的矿山，由于充填体无法直接暴露，阶段矿柱回采临界厚度的保留成为残矿回收的突出难题。基于传统弹性梁理论，结合实际情况，将阶段矿柱简化为均布载荷下两端固定的弹性梁力学模型，推导了其弹性应力解，揭示了是阶段矿柱上采过程的第1破坏应力。理论分析表明：影响矿柱上采顶板临界厚度的主要因素为：散体载荷、回采跨度和岩体抗拉强度。利用FLAC3D完成了多因素组合影响阶段矿柱上采过程数值模拟正交试验，分析了单一影响因素与顶板临界厚度的关系，利用多元非线性回归的数学方法，建立了上采过程三因素组合影响下阶段矿柱临界厚度数学预测公式。最终，实现了散体介质下阶段矿柱上采临界厚度的预测。结合凤凰山铜矿-240 m阶段矿柱回采实际，表明了该预测公式的适用性。

Abstract

For level pillar stoping under loose medium

determining the critical thickness of roof is difficult. In order to solve the problem

using elastic beam theory

the level pillar is simplified as a mechanical model of a beam fixed at both ends under uniform load; and is considered to be the main failure stress according to the elastic stress solution of beam. Theoretical analysis shows: in level pillar stoping process

the main influence factors of critical thickness of roof is loose medium load

stoping span and tensile strength of rocks. Through using FLAC3D and combining with orthogonal experiment result of numerical simulation

the relationship between single influence factor and critical thickness of roof is revealed. Based on multiple nonlinear regression analysis method

the mathematical forecasting formula of critical thickness of roof under multifactor influence is established. Finally

The critical thickness of the roof is predicted accurately; and applicability of the mathematical forecasting formula is verified by the engineering practice of level pillar stoping in Fenghuangshan Mine.

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