考虑岩体变形特性的圆形压力隧洞衬砌应力计算方法

在水工圆形压力隧洞衬砌应力计算中,假定岩体是弹性体,这与岩体变形特性不完全相符。本文根据原位岩体变形试验结果,考虑了岩体弹-塑性变形,按线性强化材料处理,建立了衬砌应力计算方法,给出了岩体产生塑性变形的临界内水压力,并指出了岩体力学参数如何确定。

Calculation Method of Stresses in Pressure Tunnel Lining Allowing for the Characteristics of Rock Mass Deformations

In calculating the lining stresses of a pressure tunnel with circular cross-section it is generally assumed that the rock mass is elastic. However, this assumption does not often accord with the characteristics of rock mass deformation. This paper presents a method of calculating the lining stresses, in whieh the test results of elasto-plastic deformations of rock mass are considered and it is treated as linear strain-hardening material. The critical interior water pressure ia the tunnel which creats the plastic deformations of rock mass is given. It is also indicates how to determine the parameters of rock mechanics.