隧道围岩压力的应力分析方法  

Stress analysis method for pressure of surrounding rocks on tunnels

作　　者：林乐彬[1] 刘寒冰[1] 刘辉[2] 

机构地区：[1]吉林大学,吉林长春130022 [2]长沙理工大学岩土工程研究所,湖南长沙410076

出　　处：《土木工程学报》2007年第8期85-89,共5页China Civil Engineering Journal

摘　　要：围岩压力值是进行隧道设计和稳定性研究的重要依据,一般求解围岩压力常采取经验简化方法,如普氏计算法、太沙基计算方法等。这些经验方法简单实用,但求得的围岩压力值没有考虑隧道断面的形状影响和局部的压力变化,更无法考虑隧道围岩复杂的地质条件和地形地表条件,在隧道结构设计中有一定的局限性。有限元法在求解非线性问题和复杂边界问题方面有很好的效用,目前是岩土工程采用最为广泛的数值分析方法。从应力分析的角度,通过应用有限元软件对湖南湘西某隧道进行应力分析,得到隧道围岩压力的规律,给出应力分布图和包括顶压和侧压的围岩压力图,进而分析该隧道的稳定性。Surrounding rock pressure on tunnels is a key parameter for tunnel design and stability analysis. It is commonplace that the rock pressure is calculated by using some classical simplified methods, such as the Terzaghi theory and Promojiyfakonov theory. Although practical, these simplified methods are limited by its incapability of considering the shape of the tunnel cross-section, the local stress difference, the geological condition, the structure of the surrounding rocks, and the terrain topography. In this paper, the basic theory of FEM is introduced together with the adopted software of Geocad-SAFE. Numerical stress analysis is carried out for a tunnel located in west Hunan Province. The stress distribution around the tunnel is obtained and the stability of the surrounding rocks is studied.

关 键 词：应力分析 有限元法 隧道 围岩压力 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]