Abstract
In order to effectively solve a series of problems such as the difficulty of coal and rock interbed roadway support in Gaojiazhuang Coal Mine and get a scientific and reasonable optimization scheme of surrounding rock support, theoretical analysis, numerical simulation, ultrasonic detection, field-effect test, and other means are adopted to analyze the instability of coal and rock interbed roadway. The results show that the interbedded roadway has weak interbedded cementation, and its ore pressure is more intense due to the influence of its interbedded weak structural plane. Based on Mohr’s strength envelope principle, it is proposed that horizontal stress is the main factor that causes a wide range of shear displacement, penetration crack, and surrounding rock failure of the roof of this kind of roadway. Through the finite element numerical simulation analysis, the deformation and failure law, stress distribution characteristics, and failure area distribution characteristics of coal and rock interbedding roadway surrounding rock are theoretically revealed, and the control effect of different support schemes on roadway surrounding rock deformation is greatly different. Based on the ultrasonic detection technology, it is proved that the roadway side failure has strong zoning characteristics, and the failure range and stress distribution range of the surrounding rock of the belt roadway in the 2103 working face of Gaojiazhuang Coal Mine are detected. Finally, the coupling strengthening support scheme combining prestressed anchor cable and bolt is proposed. The engineering application and the observation of surrounding rock deformation show that the reinforced support technology can effectively enhance the stability of the surrounding rock of the interbed roadway in Gaojiazhuang Coal Mine, and it has a good reference for the surrounding rock conditions of this kind of roadway.
Highlights
With the improvement of mechanization and intensification of coal mine mining, mining roadway section area is increasing, so in the construction of mining roadway, the way of breaking the bottom along the top or breaking the top along the bottom is often used to carry out the construction, resulting in the coalrock interbed roadway proportion more and more
Theoretical analysis, and numerical simulation to determine the reasonable width of coal pillars in the thin coal roof face section affected by high geostress and creep damage in deep wells [11]
Zhong et al used similar simulation tests and Advances in Civil Engineering numerical simulation tests to study the adaptability of the inclined trapezoidal and straight-walled semicircular arched roadway to the coal and rock interbed roadway; orthogonal simulation tests were conducted to obtain 6 coal rock instability factors of interlevel roadways [13, 14]
Summary
With the improvement of mechanization and intensification of coal mine mining, mining roadway section area is increasing, so in the construction of mining roadway, the way of breaking the bottom along the top or breaking the top along the bottom is often used to carry out the construction, resulting in the coalrock interbed roadway proportion more and more. Due to the differences in the geological occurrence and mining technology conditions of coal seams in coal mines, the instability mechanism of coal-rock interbed roadway in different areas and its support technology still need to carry out theoretical and practical research according to local conditions [21,22,23,24,25,26,27,28,29,30]. Influenced by the occurrence condition of the coal seam, the interbedding arrangement of coal and rock along the top and bottom is adopted in the excavation of 203 working face, which brings great difficulties to roadway support. 3. Research on the Failure Mechanism of CoalRock Interbed Roadway e stress environment of the rock mass is a relatively balanced three-dimensional stress stable state before coal and rock interbedding roadway excavation. The stress is adjusted and transferred to the surrounding roadway, causing local stress concentration, increasing the maximum principal stress, and decreasing the minimum principal stress, which shows that the Moire circle is cut by the strength envelope after roadway excavation construction, and the coal and rock mass are
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