Research On Fatigue Design Of Large-scale Model Test For Shield Tunnel Structure Dynamic Loads Caused By High-speed Train

In this dissertation, a preliminary study at Guangzhou Metro Guangzhoubei station to Huacheng Road station shield tunnel model design through the Wuhan-Guangzhou high-speed rail and related parameter selection. The Shield tunnel test is designed to detect the stress response and structural fatigue law under the load of Wuhan-Guangzhou high-speed rail vehicle.There are a few scholars study on fatigue design of large-scale model test for shield tunnel structure dynamic loads caused by High-speed train. In this dissertation, the following contents are mainly based on the research ideas and results of similar shaking table simulation test. The main research work and results are as follows:1. Considering the testing requirements and limits of test conditions, and in accordance with the law of similarity rtheory, this test deducts the geometric similarity ratio of 1:10, similar density ratio of 1:1, elastic model similarity ratio of 1:10.2. In reference to a large number of model test designs, the test confirms with quartz sand, barite powder, Vaseline, as the base material of surrounding rock, and gypsum, quartz sand, diatomaceous as the base material of shield segment. Pure aluminum wire as the material of segment reinforced and connecting bolts3. In reference to a large number of model test designs, the test proposed the high-speed railway train vibration force function curve for the first time, which is based on the speed of train and rail load distribution of train vibration force; By simplifying the train vibration force curve, this dissertation confirms the test loading function, and uses numerical simulation method to make sure the equivalent between the two force function.4. According to the destruction of existing segment and segment dynamic response, this dissertation analysis the putative segment fatigue damage location. By the segment failure characteristics, this dissertation proposed the sensor placement scheme; In combination with concrete fatigue failure characteristics, this dissertation proposed the segment fatigue criterion which is based on the concrete destruction of the first stage and the second stage.5. Complete the design of large-scale model test for shield tunnel structure dynamic loads caused by High-speed train.