Study on Floor Mechanical Failure Characteristics and Stress Evolution in Double Predriven Recovery Rooms

Joint Authors

Feng, Guorui
Li, Songyu
Wang, Pengfei
Guo, Jun
Qian, Ruipeng
Sun, Qiang
Hao, Chenliang
Wen, Xiaoze
Liu, Jianan

Source

Mathematical Problems in Engineering

Issue

Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-13, 13 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2020-04-21

Country of Publication

Egypt

No. of Pages

13

Main Subjects

Civil Engineering

Abstract EN

This paper takes the double predriven recovery rooms (DPRR) of 31109 panel of a coal mine in Inner Mongolia as a case study.

DPRRs are used to withdraw mining equipment, which play a significant role in safe and efficient production in the final longwall mining stage.

Theoretical analysis and numerical simulation were carried out to study the reasonable size of the front abutment pillar between DPRR (inter-DPRR pillar) and the damage depth of the DPRR floor.

The results show that (1) the stress distribution of the fender (the remnant longwall panel) can be approximately divided into three stages with the advance of the working face: stress redistribution (the first) stage, stress superimposed growth (the second) stage, and stress transfer (the third) stage.

(2) According to stress distribution and the corresponding failure mode of the fender, the calculation model of the slippage damage of the DPRR floor is rectified, and the damage range of the floor is rezoned to make it more suitable for the damage depth of the room.

(3) The zone of influence of the front abutment pressure is 40–50 m, and the stress around the DPRR increases significantly in the final mining stage.

When the size of the inter-DPRR pillar is greater than 15 m, the effect of increasing the coal pillar size on lowering the peak stress of the main predriven recovery room is limited.

(4) Floor heave tends to increase at first and then decrease with depth and reaches the maximum in the depth of 5 m in the final mining stage, indicating that 5 m is the starting point for the initial depth of the floor heave.

(5) The theoretical calculation shows that the reasonable size of the inter-DPRR pillar is 20 m, and the critical width of the fender is 18.48 m, which can guide the secondary support to prevent dynamic disasters.

Floor grouting and constructing concrete floor are effective and economic ways to control the floor heave.

American Psychological Association (APA)

Feng, Guorui& Li, Songyu& Wang, Pengfei& Guo, Jun& Qian, Ruipeng& Sun, Qiang…[et al.]. 2020. Study on Floor Mechanical Failure Characteristics and Stress Evolution in Double Predriven Recovery Rooms. Mathematical Problems in Engineering،Vol. 2020, no. 2020, pp.1-13.
https://search.emarefa.net/detail/BIM-1202201

Modern Language Association (MLA)

Feng, Guorui…[et al.]. Study on Floor Mechanical Failure Characteristics and Stress Evolution in Double Predriven Recovery Rooms. Mathematical Problems in Engineering No. 2020 (2020), pp.1-13.
https://search.emarefa.net/detail/BIM-1202201

American Medical Association (AMA)

Feng, Guorui& Li, Songyu& Wang, Pengfei& Guo, Jun& Qian, Ruipeng& Sun, Qiang…[et al.]. Study on Floor Mechanical Failure Characteristics and Stress Evolution in Double Predriven Recovery Rooms. Mathematical Problems in Engineering. 2020. Vol. 2020, no. 2020, pp.1-13.
https://search.emarefa.net/detail/BIM-1202201

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-1202201