应用离心模型试验分析涵洞病害机理

Studies on distress mechanism of culverts by centrifugal model test

利用离心模型试验,通过模拟实际依托工程的地基形式、回填材料、沟坡地形以及施工工艺,分析了涵洞发生病害的全过程,利用图片测量软件再现了土体、涵洞结构体、地基相互作用的过程,阐述了涵洞纵向不均匀沉降所产生的“扁担效应”对涵洞结构破坏的机理,根据实录影像描述了涵洞模型裂缝的发展形式,并与实际病害工程对比。

Based on centrifugal model test, the whole course of distress of culverts was analyzed by simulating the foundation, ravine land, fill material and construction technology of practical projects. The software of image measuring was utilized to reproduce the interaction course among the soil mass, culvert structure and ground. And it was shown that the destruction mechanism of culvert structure was attributed to the phenomena of shoulder pole, which was engendered because of longitudinal unequal settlement. The evolution of crack on the culvert model was described by recording of video tape, which was simultaneously contrasted to the practical diseased project.