Fracturing of the Soft Rock Surrounding a Roadway Subjected to Mining at Kouzidong Coal Mine

Joint Authors

Tang, Qingteng
Wang, Xingkai
Su, Zhili
Jing, Shengguo
Xie, Wenbing

Source

Advances in Civil Engineering

Issue

Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-17, 17 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2020-08-25

Country of Publication

Egypt

No. of Pages

17

Main Subjects

Civil Engineering

Abstract EN

The fracture development and distribution around the deep soft rock roadway are pivotal to any underground design.

In this paper, both field investigation and numerical simulation were taken to study the fracture evolution and rock deformation of a coal mine roadway at Kouzidong mine, Fuyang, Anhui Province, China.

Based on the borehole imaging technique, we found an asymmetric distribution of the fracture zone in the surrounding rock of the roadway.

By analyzing the C value of the fractures in the borehole images,we found that the fracture interval distribution of the surrounding rock of the tunnel, the number of fractures will fluctuate decrease with the increase of the depth.

To effectively study the fracture propagation and distribution of the roadway under longwall retreatment and roadway excavation, the global-local numerical technique was applied via FLAC3D and PFC2D.

In the roadway excavation process, fractures were first formed in the shallow section of the roadway and progressively propagated toward the deeper soft rock layer; the main failure mechanism was a tensile failure.

During longwall retreatment, fractures continuously developed toward the deeper soft rock layer.

However, the failure mechanism transformed to shear failure.

From numerical results, it can be seen that the stress concentration at the ribs was released, which led to shear failure at the roof and floor.

Due to the extensive tensile cracks in the shallow section, the surrounding rock experienced expansion and fracture.

The deep shear failure also induced the formation of the nonadjacent crushing zone and elastic zone, which is in line with the borehole imaging results.

American Psychological Association (APA)

Su, Zhili& Xie, Wenbing& Jing, Shengguo& Wang, Xingkai& Tang, Qingteng. 2020. Fracturing of the Soft Rock Surrounding a Roadway Subjected to Mining at Kouzidong Coal Mine. Advances in Civil Engineering،Vol. 2020, no. 2020, pp.1-17.
https://search.emarefa.net/detail/BIM-1122578

Modern Language Association (MLA)

Su, Zhili…[et al.]. Fracturing of the Soft Rock Surrounding a Roadway Subjected to Mining at Kouzidong Coal Mine. Advances in Civil Engineering No. 2020 (2020), pp.1-17.
https://search.emarefa.net/detail/BIM-1122578

American Medical Association (AMA)

Su, Zhili& Xie, Wenbing& Jing, Shengguo& Wang, Xingkai& Tang, Qingteng. Fracturing of the Soft Rock Surrounding a Roadway Subjected to Mining at Kouzidong Coal Mine. Advances in Civil Engineering. 2020. Vol. 2020, no. 2020, pp.1-17.
https://search.emarefa.net/detail/BIM-1122578

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-1122578