Collaborative control technology of external anchor-internal unloading of surrounding rock in deep large-section coal roadway under strong mining influence

被引：0
|
作者：
Xie S. [1 ,2 ]
Wang E. [1 ]
Chen D. [1 ,2 ]
Jiang Z. [1 ]
Li H. [1 ]
Liu R. [1 ]
机构：
[1] School of Energy and Mining Engineering, China University of Mining & Technology-Beijing, Beijing
[2] Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining & Technology-Beijing, Beijing
来源：
Meitan Xuebao/Journal of the China Coal Society | 2022年 / 47卷 / 05期
关键词：
Collaborative control; External anchor-internal unloading; Pressure compensation space; Soft-broken coal; Stress transfer; Strong mining influence;
D O I：
10.13225/j.cnki.jccs.XR21.1990
中图分类号：
学科分类号：
摘要：
Aiming at the control problems of continuous large deformation and failure of surrounding rock in soft-broken coal roadway under the influence of deep severe dynamic pressure disturbance, a large-section soft-broken coal roadway affected by deep strong mining in a coal mine is taken as the object, the ground pressure behavior laws of deep coal roadway under strong mining influence are analyzed. The main causes of large deformation and failure of surrounding rock are expounded, and the main control difficulties are obtained. Based on this, a collaborative control technology of external anchor-internal unloading of large section coal roadway under deep strong mining influence is proposed. The shallow strengthening anchorage technology of anchoring and grouting improves the strength of the main bearing structure and creates a good construction environment for internal unloading. In the deep stress peak area of two sides of the coal roadway, large-diameter holes are made for internal unloading and its mechanism of transferring the peak stress of two sides to solid coal of the hole on the basis of ensuring that the integrity of shallow anchored surrounding rock is not destroyed is expounded. The arrangement of internal large-diameter holes transfers the deformation of deep coal and rock mass to the unloading hole group, provides pressure compensation space for continuous outward migration and deformation. Reinforced anchorage can effectively block the migration of deep coal and rock mass to coal roadway space, and it can reduce the deformation of two sides of surrounding rock. The collaborative control mechanism of "consolidation and repair, strong anchor by truss-cable, internal unloading and stress transfer, internal and external coordination" of external anchor-internal unloading of surrounding rock of large-section coal roadway has been put forward. Through similar simulation and numerical simulation, the feasibility of external anchor-internal unloading cooperative control technology of the roadway is verified. The field engineering practice shows that the coal roadway adopts the cooperative control technology of external anchor-internal unloading, which can effectively resist the large deformation of two sides of surrounding rock in large-section soft-broken coal roadway under the influence of strong mining, and the stress state of surrounding rock is significantly improved. © 2022, Editorial Office of Journal of China Coal Society. All right reserved.
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页码：1946 / 1957
页数：11
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