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本文把岩体作为粘弹性介质,用伯格斯模型描述岩体的流变特性,对均质、连续、各向同性的岩体在围岩稳定分析中如何考虑岩体的流变特性,提出了一种数值计算方法,并对较坚硬的正长岩和较软弱的砂岩进行了流变计算。算例表明:岩体的流变特性对岩体,特别是软弱岩体的围岩稳定影响是不容忽视的,在围岩稳定分析中,粘弹性方法比弹性方法具有更好的近似性,它能更好地为我们预示洞室围岩塑性区的发展和洞周位移的变化情况,并为寻求有利的支护时间和支护形式提供依据。
In this paper, the rock mass is considered as a viscoelastic medium, and the rheological properties of the rock mass are described using the Burgers model. How to consider the rheological properties of the rock mass in the stability analysis of the surrounding rock for homogeneous, continuous, and isotropic rock masses is proposed. A numerical calculation method was used to calculate the rheological behavior of harder syphon and weaker sandstones. The calculation example shows that the rheological properties of rock mass can not be neglected for the stability of rock mass, especially the weak rock mass. The viscoelastic method has a better approximation to the elastic method in stability analysis of the surrounding rock. It can better predict for us the development of the plastic zone of the surrounding rock of the cavern and the change of the displacement around the cavern, and provide a basis for seeking favorable support time and supporting forms.