摘要
应用荷载结构法,对厦门海底隧道衬砌结构的可靠性进行计算分析。首先应用拉丁超立方抽样法(LHS)随机抽样得到一组随机数,然后代入有限元方程求解,得到一组响应变量的解,最后将这组解进行统计分析,从而得到该响应变量的分布特征。通过对各随机变量的灵敏度分析,结构的覆土厚度、外水头高度、围岩的弹性抗力系数、衬砌混凝土的弹性模量以及围岩的侧向压力系数的变化对最大弯矩影响明显。其中,最大弯矩受结构的覆土厚度影响最大,其次是外水头高度。采用蒙特卡洛法对海底隧道衬砌结构进行可靠度分析,结果表明翔安海底隧道的衬砌结构安全可靠。
The reliability of the lining structure of Xiang＇an subsea tunnel in Xiamen is analyzed by means of load-structure method.Finite element analysis is performed to calculate the structural samples,whose mechanical variables are sampled by Latin Hypercube Sampling Technique（LHST）,and a set of response variables are obtained.The distribution characteristics of the variables are obtained by statistically analyzing on the response variables.The sensitivity analysis on the random variables shows that the variations of the the cover depth,water head,elastic resistance coefficient of the surrounding rocks,elastic modulus of lining concrete and the lateral pressure coefficient of the surrounding rocks have obvious influence on the maximum bending moment of the lining strucuture.The cover depth is the factor that has the greatest influence on the maximum bending moment,while the water head is the factor that has the second greatest influence on the maximum bending moment.The reliability of the lining structure of Xiang＇an subsea tunnel is analyzed by means of Monte Carlo method,which shows that the lining structure is safe and reliable.
出处
《隧道建设》
2011年第4期411-415,528,共6页
Tunnel Construction
关键词
海底隧道
风化槽
衬砌结构
可靠度
subsea tunnel
weathering slot
lining structure
reliability
