响应面方法在整体式隧道衬砌可靠性分析中的应用

在特性参数有较多样本时，蒙特卡罗法是目前计算结构可靠度的一种较为准确的方法。但在地下工程中，可以得到的特性参数样本数往往有限，因此，使用响应面方法更具有实际意义。针对铁路隧道整体式衬砌，将响应面方法所得的结果与蒙特卡罗法10万次抽样结果进行了对比分析，发现除了弯矩为零附近的截面外，其他截面上二者有较好的一致性，显示响应面方法应用于隧道衬砌可靠性分析是可行的。

APPLICATION OF RESPONSE SURFACE METHOD TO RELIABILITY ANALYSIS OF MONOLITHIC LINING OF RAILWAY TUNNEL

When there is large number of samples of characteristic parameters,the Monte-Carlo method is a comparatively accurate method to compute reliability of structure. However,in underground engineering,available samples of those characteristic parameters are quite limited in quantity,so it is more practical to use response surface method instead. In the light of monolithic lining structure of railway tunnel,the results from response surface method are analyzed and compared with those from 100 000 samplings by Monte-Carlo method. It is found that the two methods are mutually in good agreement on all sections except the place where the bending moment is approximately zero,which shows that response surface method is feasible to calculate reliability of railway tunnel lining.