材料期刊网

本文从岩体的流变性质及喷射混凝土支护与岩体相互作用的观点,对支护机理作了初步探讨。以岩石流变模型为基础,考虑支护对岩体的反作用力,导出了在平面变形条件下圆形断面平巷及竖井岩体中应力、应变、位移与时间关系的公式,还导出岩体中应力、应变分布公式,给出了计算喷射混凝土支护内部的应力、应变及位移公式。最后,在理论结果的基础上,作者提出设计喷射混凝土厚度及所需强度的计算公式。

The method of shotcrete for roadway and shaft support has been developedin no less than fifty underground metal mines in China, but so far a theoreticalanalysis is lacking. Since the deformation on the support and that on the contact plane of rockmass are identical and at the same time taking into account the reaction of rockmass on support, the correlation of stress-strain and displacement of rock mass inroadway and shaft of circular cross-section under condition of plane strain vary-ing with time may be viewed on a rheological model of rock mass. Hence, thecorresponding expression for the distribution of stress and strain over the rockmass and the equation for calculating stress-strain and displacement of shotcretesupport are worked out. The formulae of thickness and strength in various desi-gnings required for shotcrete thus obtained are reliable for engineering practice.