Investigation of Mechanical Properties for Group Anchors

Juncai Cao,Shanyong Wang,Qun Wei,Nong Zhang

doi:10.3390/app11041521

Abstract

Prestressed anchor support is one of the most important support methods for coal mine roadways. As the coal mining depth increases, the adaptability of existing prestressed anchor has become weaker and weaker, which is mainly reflected in the current anchor prestress is much smaller than the support resistance required for the stability of the roadways and makes it difficult to effectively control the roadways. In order to solve the problem, a group anchor structure was proposed to realize higher prestressed anchor support technology and improve the support status of deep roadways. For coal mine roadways, group anchor structure is a new technology and new topic, and the design method and theoretical basis of the group anchor support are lacking. Therefore, the paper studied the bearing capacity of the group anchors through physical tests and numerical simulations. Among them, a special set of group anchor drawing tooling was designed and processed to match the physical test. The test results show that the group anchor structure can double the bearing capacity and bearing rigidity compared with traditional anchors, and the group anchor support can further optimize the support parameters to improve the bearing capacity of the surrounding rock. Therefore, the group anchor support is helpful to the stability control of the surrounding rock of the deep roadway.

Highlights

Anchor support is the most common, fastest, and cheapest support method in mining roadway [1,2,3]
The main reason is that the bearing capacity of a single anchor structure is limited and cannot provide sufficient support resistance
(c) middle of the three-group anchors, which was caused by the coupling stress under the simultaneous action of the three rods

Summary

Introduction

Anchor support is the most common, fastest, and cheapest support method in mining roadway [1,2,3]. With the degradation of mining environment, the adaptability of existing anchor support technology has become weaker and weaker. The main reason is that the bearing capacity of a single anchor structure is limited and cannot provide sufficient support resistance. The nature of surrounding rock support is mechanical balance [7]; if the anchors cannot provide sufficient support resistance, the surrounding rock cannot maintain stability. Prestressed anchor support is the most direct way to provide support resistance. From the perspective of mechanical balance alone, a substantial increase in support resistance will help the long-term stability of the surrounding rock

Methods

Results

Discussion

Conclusion