特厚复合顶板锚杆支护角度确定新方法

doi:10.11799/ce201705022

Abstract

Abstract: As the extra thick compound roof is quite thick and easy to bed layer and damage, the improper maintenance of roadway can extremly easy to cause casualty accidents by large roof fall. Therefore,its design requirements is stricter on bolt angle.Firstly, this paper refers to the concept of stress ellipse from numerical simulation and analyzes and summarizes the laws of roof damage from shear stress ellipse. Secondly,by theoretical analysis, the paper proposes a new method of calculation bolt support angles. Research results are as follows: The simulation results show that both sides of the tunnel roof are mainly shear failure, and the shear stress was significantly greater than the shear stress in the middle;The paper calculates the specific trajectory equations of shear stress ellipse by caving arch equation and finds the calculation method of bolt inclination angle based the trajectory equation of stress ellipse; The paper calculates the angle of bolt support and puts it compiled into two data tables. This provides the basis and guidance for similar projects support.

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http://www.coale.com.cn/EN/Y2017/V49/I5/69

References

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Study on New Method of Angle Computation of Bolt Act on Extra Thick Compound Roof

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