Abstract
In order to meet the security and high-efficiency production needs, high-strength bolt (cable) reinforcement technology is usually used to maintain the stability of roadways. However, due to the great variability of lithology and mechanical properties, the failure form and stability of the layered roof in coal roadways are significant differences. The traditional supporting design method of the layered roof support in coal roadways is the engineering analogy method, which depends on experiences rather than theoretical analysis. Based on the theory of the elastic foundation beam and key stratum, this paper establishes a simplified analytical model of layered roof strata in coal roadways. Based on the Mohr-Coulomb theory, this paper gives the failure criteria of the layered roof strata, and the failure range of the layered roof strata is obtained. The length and pretightening force of bolt (cables) of the layered roof strata can be calculated based on the suspension theory and composite beam theory, which providing a quantitative theoretical basis for the determination of supporting parameters. Finally, as a case, the layered roof strata failure range and supporting parameters of the S1301 auxiliary transportation roadway in Gucheng coal mine are calculated.
Highlights
With the continuous innovation of energy mining technology [1], the support technology of roadway is constantly innovating
The study on the deformation mechanism and the supporting parameters of layered roof strata mainly depend on simulation tests, numerical simulations, and field measurements rather than theoretical analysis [10,11,12,13]
Zhang et al [14] studied on the mining instability characteristics and failure modes of the layered roof with three types of weak intercalation which depended on simulation tests and proposed the control principle of the roadway surrounding rock
Summary
With the continuous innovation of energy mining technology [1], the support technology of roadway is constantly innovating. It is very important to analyze the surrounding rock pressure and failure characteristics of the layered roof strata. Due to the existence of the free surface and unbalanced surrounding rock pressure, the layered roof strata of rectangular coal roadways will bend and deform to the free surface. Zhang et al [14] studied on the mining instability characteristics and failure modes of the layered roof with three types of weak intercalation which depended on simulation tests and proposed the control principle of the roadway surrounding rock. Based on the composite beam theory and elastic foundation beam model [6, 19,20,21], the deformation characteristics of the layered roof strata in rectangular roadways are analyzed in this study. We can calculate the length and pretightening force of the bolt (cable) based on the suspension theory and composite beam theory, which provides a quantitative theoretical basis for the determination of the supporting parameters
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