Influence of loading and unloading of hydraulic support on the caving property of top coal

被引：12
|
作者：
Lv, Huayong [1 ,3 ]
Liu, Fei [2 ]
Gao, Xu [4 ]
Zhou, Tao [5 ]
Yuan, Xiang [1 ]
机构：
[1] Shangqiu Normal Univ, Sch Architecture & Engn, Shangqiu 476000, Peoples R China
[2] Nanjing Tech Univ, Coll Emergency Management, Nanjing 211816, Peoples R China
[3] Coal Ind Engn Res Ctr Top Coal Caving Min, Beijing 100083, Peoples R China
[4] China Acad Railway Sci Corp Ltd, Railway Engn Res Inst, Beijing 100081, Peoples R China
[5] Shangqiu Normal Univ, Sch Foreign Languages, Shangqiu 476000, Peoples R China
来源：
STEEL AND COMPOSITE STRUCTURES | 2023年 / 48卷 / 01期
关键词：
cracks parameters; cyclic loading and unloading; hydraulic support; quantitative analysis; top coal;
D O I：
10.12989/scs.2023.48.1.103
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The caving property of top coal is a key factor to the success of top coal caving mining. The influence law of cyclic loading and unloading of hydraulic support on top coal caving is of great significance to improve the recovery rate of top coal. The similar simulation methods were used to study the dynamic evolution of the top coal cracks under the multi-cycle action of the support, and the parameters of top coal cracks were analyzed quantitatively in this paper. The results show that the top coal cracks can be divided into horizontal cracks and vertical cracks under the cyclic loading and unloading of the support. With the increase of the times of the support cycles loading and unloading, the load on the support decreases, the fractal dimension of the cracks increases, the number and total length of the top coal cracks increases, and the top coal caving is getting better. With the increase of the times of multi-cycle loading and unloading, the fractal dimension, total crack length and crack rate of top coal show a trend of rapid increase first and then increase slowly. Both the total length of the top coal cracks and the crack rate basically show linear growth with the change of the fractal dimension. The top coal caving can be well improved and the coal resource recovery rate increased through the multi-cycle loading and unloading.
引用
收藏
页码：103 / 111
页数：9
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