铁路隧道衬砌极限状态法设计软件开发及应用

Development and Application of Limit State Method Design Software for Railway Tunnel Lining

目前,铁路隧道设计方法已由安全系数法向极限状态法转轨,但缺乏隧道衬砌结构极限状态法设计专用软件,衬砌设计仍需采用多软件协同作业的传统方法完成,过程繁琐,效率较低。提出基于VB6.0开发的铁路隧道衬砌极限状态法设计软件的构建思路、软件功能、软件模块及操作流程,介绍软件在铁路隧道极限状态法转轨工作中的应用成果。该软件集建模、有限元计算、配筋设计、结果显示及结果输出等功能于一体,避免了衬砌结构设计采用多个软件联合处理的繁琐操作。在铁路隧道极限状态法转轨工作中的应用表明,该软件将衬砌及明洞结构的单次设计完成时间由传统方法所需的20 min降为5 min左右,在计算效率上优势明显;衬砌及明洞结构采用极限状态法和采用安全系数法的工程投资大致相当,笔架山隧道和岐山隧道采用极限状态法较安全系数法工程投资分别节约0.73%和1.6%。

At present,the design method of railway tunnel has changed from safety factor method to limit state method,but there is a lack of professional software for the design of secondary lining structure with limit state method.The lining design still requires traditional method of multiple software cooperative operation,which is complicated and inefficient.This paper introduces the concepts,functions,modules and operation flow of the software developed for the design of railway tunnel with lining limit state method based on VB6.0,and presents the application results of the software used in the work of transition to limit state method.The software integrates the functions of modeling,finite element calculation,reinforcement design,result display and result output,which avoids the complicated operation of multiple software cooperative working in lining design.Furthermore,the application of the software used in the work of transition to limit state method shows that the single design time of the lining and open cut tunnel is reduced from 20 minutes to about 5 minutes on account of its remarkable calculation efficiency.In addition,the project investments of lining and open cut tunnel based on the limit state method and the safety factor method are approximately the same,and the limit state method can save 0.73%and 1.6%respectively for Bijiashan Tunnel and Qishan Tunnel compared with the safety factor method.