Mechanism of Time-Dependent Instability of Deep Soft-Rock Roadway and Crack-Filling Reinforcement Technology

Soft broken surrounding rock exhibits obvious rheological properties and time-dependent weakening effects under the action of deep high-ground stress, leading to the increasingly prominent problem of sustained large deformation in deep roadways. In this study, with the II5 Rail Rise in Zhuxianzhuang...

Full description

Saved in:
Bibliographic Details
Published in:Applied sciences 2023-04, Vol.13 (7), p.4641
Main Authors: Wu, Bowen, Chang, Jucai, Li, Chuanming, Wang, Tuo, Shi, Wenbao, Wang, Xiangyu
Format: Article
Language:English
Subjects:
Boreholes
Coal industry
Coal mines
Coal mining
Control systems
crack filling
deep roadway
Deformation
Engineering
Instability
Mathematical models
Numerical analysis
Onsite
Plastic deformation
Rheological properties
Roads & highways
Rocks
Simulation
Simulation methods
soft rock
stability analysis
Stress concentration
Technology
time-dependent damage
Velocity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Soft broken surrounding rock exhibits obvious rheological properties and time-dependent weakening effects under the action of deep high-ground stress, leading to the increasingly prominent problem of sustained large deformation in deep roadways. In this study, with the II5 Rail Rise in Zhuxianzhuang Coal Mine as an example, the mechanism and control technology of time-dependent damage and instability in a deep soft-rock roadway were explored through a field observation and numerical simulation. The research results show that the range of the loose circle in the deep fractured surrounding rock can reach 3.0 m. The expansion of shallow and deep cracks causes the primary plastic deformation and secondary rheological deformation of the surrounding rock, with the rheological deformation rate increasing by 21.4% every 55 days on average, which ultimately induces the instability and failure of the surrounding rock. Based on the mechanism of roadway instability, a control technology of high-preload bolt + deep- and shallow-borehole crack filling was proposed. The technology reduces deformation and ensures the stability of the roadway surrounding rock by inhibiting the propagation of deep and shallow cracks and reinforcing the surrounding rock.
ISSN:2076-3417
2076-3417
DOI:10.3390/app13074641