隧道相似模型中试验边界尺寸选取的探讨

目前相似模型试验方法在隧道及地下工程领域的应用越来越为广泛。由于进行模型试验的试验平台规格不一,研究人员在进行模型试验以及不同试验平台数据结果对比分析时经常会面对边界条件影响这一问题。边界条件作为相似模型试验中最为基本且关键的部分,直接关系到试验结果的可信度。本文结合南湖路湘江水下隧道相似模型试验,讨论边界条件在一定范围改动时对试验结果的影响。从试验结果来看,所获取的数据与工程现场采集的数据有着较好的相似度,因此建议针对隧道等几何尺寸较为规则的结构进行相似模型试验时,可以结合试验设备情况对边界条件进行一定改动。

DISCUSSION ON SELECTION OF TEST BOUNDARY SIZE IN TUNNEL SIMILAR MODEL

At present similar model test methods are more and more widely used in the field of tunnel and underground engineering. Because of the different specifications of test platforms for model tests, researchers often face the problem of boundary conditions when conducting model tests and comparative analysis of data from different test platforms. As the most basic and key part of similar model test, boundary conditions are directly related to the reliability of test results. Based on the similar model test of Xiangjiang underwater tunnel on Nanhu road, the influence of boundary conditions on the test results is discussed in this paper when changes are made to a certain extent. From the test results, the obtained data have a good similarity with the data collected in the engineering field. Therefore, it is suggested that the boundary conditions can be changed according to the condition of the test equipment when similar model tests are carried out on the structures with regular geometric sizes, such as tunnels.