Numerical Simulation Study on Mechanism of Roof Directional Breaking in Gob-Side Entry Formed Automatically Without Coal Pillars

被引：7

作者：

Zhang, Jun ^{[1
,2
]}

Wang, Yajun ^{[2
,3
]}

He, Manchao ^{[1
,2
]}

Gao, Chengzhang ^{[4
]}

Liu, Ben ^{[1
,2
]}

Hou, Shilin ^{[1
,2
]}

Yang, Gang ^{[1
,2
]}

Liu, Jianning ^{[1
,2
]}

Yang, Jun ^{[1
,2
]}

Li, Yayun ^{[4
]}

机构：

[1] China Univ Min & Technol, Sch Mech & Civil Engn, Beijing 100083, Peoples R China

[2] China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Beijing 100083, Peoples R China

[3] Univ Sci & Technol, Sch Civil & Resource Engn, Beijing 100083, Peoples R China

[4] ShanXiYinFeng Sci & Technol CO LTD, Taiyuan 030000, Peoples R China

来源：

MINING METALLURGY & EXPLORATION | 2023年 / 40卷 / 01期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Roof directional breaking; Gob-side entry retaining; Roof movement; Deformation evolution; Stress distribution; ROCK; SUPPORT; DESIGN;

D O I：

10.1007/s42461-022-00720-y

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

To explore the mechanism of roof directional breaking in gob-side entry formed automatically without coal pillars, the numerical simulation was used to study the deformation movement of roof, the deformation evolution of roadway, and the stress distribution of roadway under roof directional breaking and non-roof directional breaking. Based on the results, the deformation movement of roof is divided into three stages: the goaf roof collapse stage, the basic roof deformation stage, and the basic roof stability stage. The goaf is filled with gangue due to the broken expansion characteristics of the collapsed rock under the roof directional breaking. Due to the supporting force of gangue, the deformation of the basic roof under the roof directional breaking is smaller than that under the non-roof directional breaking, which reduces the influence of the deformation of the basic roof on the deformation of the roadway roof and improves the integrity of the roadway. At the same time, roof directional breaking cuts off the stress transfer path of partial roof, which weakens the peak stress convergence on the arc side, transfers the peak stress convergence to deeper, and improves the stability of roadway. Finally, a field test was carried out to further verify the accuracy of the numerical simulation. The field test results are in good agreement with the numerical simulation results. The roadway deformation is small and meets the requirements of safety production. It is proved that roof directional breaking plays a positive role in improving the stability of the roadway.

引用

页码：263 / 276

页数：14

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