Force change of the gravel side support during gangue heaping under a new non-pillar-mining approach

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL
Jianning Liu, H. Manchao, Hou Shilin, Zhen-chuang Zhu, Yanjun Wang, Jun Yang
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引用次数: 6

Abstract

The force change characteristics of gravel side support structures during gangue heaping can provide useful information about roadway stability in a new non-pillar-mining approach—noncoal pillar mining with automatically formed gob-side entry (NMAFG). Considering the dynamic shock and static stacking phenomena during gangue heaping, the coefficient of restitution and Janssen model are introduced into the theoretical analysis. Analytical results show that the impact force decreased with increasing gangue heaping height under dynamic shock, while under static stacking, the gangue extrusion force first increased sharply, then increased slowly and stabilized, and the final force was unrelated to the gangue heaping height. Field monitoring was conducted to verify the rationality of the pattern obtained from theoretical analysis. The gangue support structure lateral stress from field monitoring can be divided into two periods. In Period I, the peak value at the lower monitoring point was greater than that at any other point. The lowest sensor was subjected to the greatest impact, at 59.09 kN. In Period II, the stress value first rapidly increased, then slowly increased and stabilized. The final force was unrelated to the gangue height. The sensors at #2 (highest position), #4 (middle position), and #6 (lowest position) measured 31.91 kN, 44.82 kN and 38.19 kN, respectively. The analysis confirmed the variation characteristics of the impact force and extrusion force.
一种新的无柱开采方法下矸石堆放过程中碎石侧支架受力变化
矸石堆置过程中砾石侧支护结构的受力变化特征可以为一种新的非矿柱开采方式——自动形成空边巷道的非煤柱开采巷道稳定性提供有用的信息。考虑矸石堆垛过程中的动冲击和静态堆垛现象,在理论分析中引入了恢复系数和杨森模型。分析结果表明:在动态冲击下,冲击力随矸石堆高的增加而减小,而在静态冲击下,矸石挤压力先急剧增大后缓慢增大并趋于稳定,最终作用力与矸石堆高无关。通过现场监测,验证了理论分析所得模式的合理性。现场监测的矸石支护结构侧向应力可分为两个阶段。周期1,下监测点峰值大于其他监测点峰值。最小的传感器受到的冲击最大,为59.09 kN。在第二阶段,应力值先快速增加,然后缓慢增加并趋于稳定。最终作用力与矸石高度无关。2号(最高位置)、4号(中间位置)和6号(最低位置)的传感器分别测量到31.91 kN、44.82 kN和38.19 kN。通过分析,确定了冲击力和挤压力的变化特征。
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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