Abstract
With the typical composite roof roadway and roof fall accidents in the Guizhou Province of China as the research background, the expression of damage parameters of composite roof was deduced according to Weibull statistical distribution, generalized Hooke’s law and Mises yield criterion, and the influence of shape and scale parameters of Weibull on damage characteristic was discussed. Based on the infinite slab theory, the expressions of deflection and layer separation of each layer of the composite roof were obtained, the critical load expression of each delamination was determined, and the influence of roadway width, overlying strata load, elastic modulus, shape parameters and scale parameters on the stability of composite roof was explored. The research shows that the bolt support can effectively reduce the layer separation between the composite roofs and enhance the stability of the composite roof. On this basis, it is proposed that for the surrounding rock control problem of roadways with composite roof, the active support technology with bolts as the core should be adopted.
Highlights
China is one of the countries with the most abundant coal resources in the world.According to the survey data, as of 2019, China’s total proven coal reserves are about1758.8 billion tons, ranking the third in the world
The spatial distribution of coal resources in China is characterized by more coal resources in the west and less in the east, more in the north and less in the south
Mechanical Structure Model of Composite Roof weak coal coal and and rock rock stratigraphy stratigraphy with with small small The composite roof is composed of weak low strength
Summary
China is one of the countries with the most abundant coal resources in the world. According to the survey data, as of 2019, China’s total proven coal reserves are about. 1758.8 billion tons, ranking the third in the world. The spatial distribution of coal resources in China is characterized by more coal resources in the west and less in the east, more in the north and less in the south. Inner Mongolia, Shanxi, Shaanxi, Xinjiang, and Guizhou are the top five coal producing provinces in China [1–5]. Of strengthening roof disaster prevention and control [6–11]
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