Abstract
In maintaining the efficiency of coal mining, the stability of roadway plays a significant role, as it is closely related to the production of coal and the safety of personnel. In deep underground coal mines, the rheological deformation of roadway normally occurs, which affects its service life. To address this problem, in this paper, a novel high-efficiency Jet Grouting (JG) technique was presented, and its control effect on roadway stability was investigated. A creep test of a coal specimen in a laboratory scale was performed, and its creep behavior was revealed. The rheology of the coal mass surrounding the roadway was further analyzed according to the field-monitoring results of roadway deformation. A time-dependent numerical model with a Burger-creep visco-plastic model (CVISC) was established and validated by comparing the calculated displacement with in-situ measurement. The JG technique was tested in the field, and its applicability and practicability were confirmed. According to the validated model and field test results of JG, a numerical model with CVISC by JG support was established to analyze the effect of JG on the roadway. The results showed that the JG support can effectively reduce roadway deformation, optimize stress conditions, and reduce the extent of the plastic zone around the roadway. The rheological properties of the soft coal roadway were constrained and long-term stability was ensured. This pioneering work can guide the application of JG for the stability control of roadways and promote the sustainability of coal mining efficiently.
Highlights
The efficiency and sustainability of coal mining are greatly affected by the stability of the roadway in underground mines [1]
The rheological properties of the soft coal mass had a negative effect on roadway stability, and, it is necessary to evaluate the support of Jet Grouting (JG) in controlling the time-dependent behavior of the soft coal mass surrounding the roadway
One of the objectives of this study is to reveal the rheological behavior of the soft coal mass around the roadway
Summary
The efficiency and sustainability of coal mining are greatly affected by the stability of the roadway (a transportation corridor) in underground mines [1]. High-pressure cement grout is injected into a soft coal mass and mixed with coal particles cut by a high-velocity jet, and, a “coalcrete” composite with high strength is generated By this technique, the properties of the original soft coal mass are deeply changed, and the formed coalcrete can be further used to construct coalcrete columns around the roadway profile. The rheological properties of the soft coal mass had a negative effect on roadway stability, and, it is necessary to evaluate the support of JG in controlling the time-dependent behavior of the soft coal mass surrounding the roadway. The results are very encouraging and can guide the application of JG in coal mines
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