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Numerical simulation of the influence of pillar strength on the internal synergy relationship in the backfill-pillar system
International Journal for Numerical and Analytical Methods in Geomechanics ( IF 4 ) Pub Date : 2021-07-29 , DOI: 10.1002/nag.3261
Guanghua Sun 1, 2 , Yufan Feng 1, 2 , Xiaodong Xu 3, 4 , Xulong Yao 1, 2 , Chenyang Liu 1, 2 , Yue Wang 1, 2
Affiliation  

The influence of the strength of the pillar on the bearing characteristics of the backfill-pillar system (BPS) based on the mechanism of backfill. Quantitative synergy relationships between backfill and pillar were defined and pointed out. There are four kinds of quantitative synergy relationships in the bearing process of the system. To verify the relationship, systems with different strengths of the pillar were selected to carry out numerical simulation experiments, and a mathematical calculation method to quantify synergy relationship in the BPS was designed. The results show that the system under the low strength of the pillar presents the overall increase in bearing characteristics, while the system under the high strength of the pillar presents “N”-type bearing features. Four kinds of quantitative synergy relationships able to characterise the action mechanism between backfill and pillar in each stage of the bearing of the system. Through analysis and discussion, it was concluded that the essential reason for the difference in bearing characteristics is that the effect of displacement restraint, joint support, and passive compressive weaken with the increase of the strength of pillar. The effect of pillar strength on the internal synergy of BPS is well verified by numerical simulation test.

中文翻译:

柱体强度对回填-柱体系统内部协同关系影响的数值模拟

基于回填机理的柱体强度对回填-柱体系统(BPS)承载特性的影响[J]. 定义并指出了回填土和支柱之间的定量协同关系。在系统的承载过程中有四种定量的协同关系。为了验证这种关系,选择不同强度支柱的系统进行数值模拟实验,并设计了一种数学计算方法来量化BPS中的协同关系。结果表明,支柱低强度下的系统呈现出整体承载特性的增加,而支柱高强度下的系统呈现“N”型承载特性。四种定量协同关系能够表征系统承载各阶段回填土与支柱之间的作用机制。通过分析讨论,得出承载特性差异的根本原因是随着柱体强度的增加,位移约束、联合支撑和被动抗压的作用减弱。数值模拟试验很好地验证了支柱强度对BPS内部协同作用的影响。而被动抗压则随着支柱强度的增加而减弱。数值模拟试验很好地验证了支柱强度对BPS内部协同作用的影响。而被动抗压则随着支柱强度的增加而减弱。数值模拟试验很好地验证了支柱强度对BPS内部协同作用的影响。
更新日期:2021-09-09
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