Research on Supporting Method for High Stressed Soft Rock Roadway in Gentle Dipping Strata of Red Shale

Red shale is widely distributed among the deep mine areas of Kaiyang Phosphate Mine, which is the biggest underground phosphate mine of China. Because of the effect of various factors, such as high stress, ground water and so on, trackless transport roadways in deep mine areas were difficult to effe...

Full description

Saved in:
Bibliographic Details
Published inMinerals (Basel) Vol. 11; no. 4; p. 423
Main Authors Ma, Chunde, Xu, Jiaqing, Tan, Guanshuang, Xie, Weibin, Lv, Zhihai
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.04.2021
Subjects
Coal mining
Deformation
Experiments
Failure
Groundwater
high stressed soft rock roadway
Hydraulics
Lithology
Mathematical models
Mechanical properties
Methods
Microstructure
Mineral composition
Parameters
Phosphates
Roads
Roads & highways
Rocks
Sedimentary rocks
Shale
Shales
Simulation
Stability
Strain
Strata
Stress concentration
support technology
Underground mines
wave-type bolt
Online AccessGet full text

Cover

More Information
Summary:Red shale is widely distributed among the deep mine areas of Kaiyang Phosphate Mine, which is the biggest underground phosphate mine of China. Because of the effect of various factors, such as high stress, ground water and so on, trackless transport roadways in deep mine areas were difficult to effectively support for a long time by using traditional supporting design methods. To deal with this problem, some innovative works were carried out in this paper. First, mineral composition and microstructure, anisotropic, hydraulic mechanical properties and other mechanical parameters of red shale were tested in a laboratory to reveal its deformation and failure characteristics from the aspect of lithology. Then, some numerical simulation about the failure process of the roadways in layered red shale strata was implemented to investigate the change regulation of stress and strain in the surrounding rock, according to the real rock mechanical parameters and in-situ stress data. Therefore, based on the composite failure law and existing support problems of red shale roadways, some effective methods and techniques were adopted, especially a kind of new wave-type bolt that was used to relieve rock expansion and plastic energy to prevent concentration of stress and excess deformation. The field experiment shows the superiorities in new techniques have been verified and successfully applied to safeguard roadway stability.
ISSN:2075-163X
2075-163X
DOI:10.3390/min11040423