摘要
隧道衬砌多为曲墙式,且所受荷载复杂,不易用解析的方法求得衬砌各个截面的荷载效应,一般情况下都要用数值法求解。在隧道衬砌结构可靠度分析中,常用较为简单的一次二阶矩法,并结合随机有限元法进行分析,但精度较低。虽然有很多高精度的结构可靠度分析方法,但大多太复杂或计算时间长,不适用于隧道结构的可靠度计算。经过对算法的比较分析,提出一种简单、实用的二次二阶矩法,与随机有限元法相结合,进行隧道衬砌结构的可靠度分析,并给出了具体步骤和算例,结果表明该法具有较高的精度。
Tunnel lining commonly is curve wall, and the load is complex, so load effect at each section of tunnel lining is not easily obtained. In general, numeric method is adopted to calculate the load effect. In reliability analysis for tunnel lining structure, the simple first-order second-moment method combined with stochastic finite element method is usually employed, but its precision is low. Although there are many methods of higher precision for reliability analysis, most of these methods are complicated or their calculation time is too long. They are not suitable for reliability analysis of tunnel lining structure. Hereby, it is suggested that second-order second-moment method combined with stochastic finite element method should be employed instead, and detailed formula and examples were given. Result shows that this method is of higher precision.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第13期2243-2247,共5页
Chinese Journal of Rock Mechanics and Engineering
关键词
隧道工程
衬砌
可靠度
二次二阶矩法
数值法
Finite element method
Method of moments
Numerical methods
Reliability
Tunneling (excavation)
