Abstract
Deep horizontal high stress and high permeability geological factors appear when coal mines are converted to deep horizontal mining. When the roadway is damaged by the mining face, and the supporting components are mismatched, the deep roadways necessitate extensive repair work, which has a negative impact on the coal mining economy and sustainability. This paper carried out a series of field tests on the roadways deformation, crack distribution, and loose rock zone of the deep roadways. Furthermore, a numerical calculation model was established using the discrete element method (DEM) and calibrated with laboratory tests and RQD methods. Both the stress and crack distribution in the surrounding rock of the deep roadway were simulated. The field test and the corrected numerical model showed consistency. A FISH function was used to document the propagation of shear and tensile cracks around the roadway in three periods, and a damage parameter was adopted to evaluate the failure mechanism of the deep roadways under the dynamic stress disturbance. The matching of specifications of anchor cables, rock bolts, and anchoring agent is the primary point in the control of deep roadways, and revealing the stress evolution, crack propagation, and damage distribution caused by mining effects is another key point in deep roadway controlling. The field test and DEM in this paper provide a reference for the design of surrounding rock control of deep roadways and the sustainable development of coal mines.
Highlights
Deep roadways are plagued by a variety of issues, such as asymmetrically high ground stress and various lithologies, making it difficult to pinpoint the sources of structural instability and adopt effective management techniques [8,9,10]
Deep roadways are prone to a variety of challenges, such as asymmetrical high ground stress, making it hard to understand the reasons for structural instability and adopt effective approaches [11]
This study used a combination of field investigation and numerical simulation methodology to reveal the mechanism of abnormal deformation and failure characteristics of deep high-stress roadways induced by mining disturb
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. A large amount of the previous literature on the mechanism of deformation and failure of deep roadways and the research methods of control technology mainly focuses on in-site testing, theoretical models, and numerical simulations [1,19,26]. Combining the abovementioned site’s geological conditions, the method of field and numerical simulation is used to systematically study the failure characteristics of deep high-stress, analyze the stress field, crack field, and damage change characteristics of the deep high-stress main roadways affected by mining disturbances. Geological conditions and field study on the deformation and failure characteristics of the deep high-stress main roadways; Numerical simulation study on deformation and failure mechanism of deep main roadways; To develop a basic control strategy of the reinforcement and repair technology of the deep main roadway in the Dongpang coal mine
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