基于蠕变影响的红砂岩围岩抗力系数的计算  

Based on rock resistant coefficient of redsandstone tunnel under the consideration of creep effect

作　　者：魏明[1] 罗凤姿[1] 

机构地区：[1]湖南工程职业技术学院,湖南长沙410114

出　　处：《四川建筑科学研究》2015年第1期155-160,共6页Sichuan Building Science

摘　　要：基于Winkler局部变形理论,将围岩划分为能够考虑蠕变效应的3个有限环模型。在应力-应变全过程曲线的基础上,采用伯格斯(Burgers)蠕变力学模型来模拟粘弹性区的蠕变变形,推导了考虑围岩蠕变效应的围岩抗力系数公式。为研究红砂岩隧道衬砌设计的围岩抗力特性,以沪昆高速铁路特大断面隧道——店塘边隧道红砂岩段为工程依托,分别计算了该段围岩有无考虑蠕变效应的抗力系数值,得到了以下结果:考虑红砂岩的蠕变效应后,围岩抗力系数值有所降低,当红砂岩段围岩软弱破碎、出现塑性流动变形时,围岩抗力系数并不为零,围岩仍具有分担荷载的能力。这一研究结果能够对隧道衬砌设计提供一定的理论指导。Based on the Winkler local deformation theory, the surrounding rock of high-speed railway tunnel was classified into three finite ring model and the creep effect is considered. On the basis of the complete stress strain curve, the Burgers creep mechanical model was used to simulate the creep deformation of viscoelastic area and the resistance coefficient calculation formula was derived which can consider the effect of creep. For studying the characteristics of surrounding rock strength of red sandstone in tunnel lining design, with Shanghai-Kunming high-speed railway Diantangbian tunnel as a support project. And calculated the value of the resistant coefficient of this red sandstone consider creep effect or not. The following results were obtained： the resistance coefficient value of surrounding rock is reduced after considering the creep effect of red sandstone. When the red sandstone appearing weak surrounding rock crushing and with plastic flow deformation, the resistance coefficient of surrounding rock is not zero and still has the ability of the load of surrounding rock. This research result can also provide certain theoretical guidance for tunnel lining design.

关 键 词：蠕变效应 红砂岩 围岩 抗力系数 

分 类 号：TU452[建筑科学—岩土工程]