桥隧相连工程多源损伤模型试验方法研究

桥隧相连工程是桥梁、隧道结构及围岩、洞口边仰坡岩土体及其防护工程的复杂组合体。其中,桥梁和隧道结构各部位及周围岩土体的力学行为及损伤机理与其结构和基础类型、相对位置、地形地质条件及外部荷载情况等密切相关。针对目前国内外对桥隧相连工程这一特殊工程实体研究较少的现状,结合相关工程实例开展Ⅳ、Ⅴ级围岩条件下的桥隧相连工程多源损伤室内模型试验方法研究:依据相似理论并结合桥隧相连工程的特点,采用量纲分析法分析模型试验中桥、隧及洞周岩土体各结构或部位中各物理量的相似指标与相互关系;拟定桥、隧模型的相似比及围岩相似模拟材料的配合比,并进行相关的材料试验。文中介绍的模型试验平台及测试方法,可为同类模型试验提供参考。

Study on Test Method of Multiple-source Damage Model of Bridge and Tunnel Connecting Works

The bridge and tunnel connecting works are a complex combination of the bridge structure and the tunnel structure and its surrounding rock,rock & soil mass of inverted slopes and protection works adjacent to the entrance.The mechanical behavior and damage mechanism of various parts of the bridge and tunnel structures and their surrounding rock & soil mass are closely related with factors such as the types of structures and foundations,relative location,terrain and geology conditions,external loads and so on.In view of the current situations that comparatively less investigations have been done into such special engineering work at home and abroad,the methed to carry out indoor model tests of multiple-source damages to bridge and tunnel connecting works in surrounding rock Grades Ⅳ and Ⅴwas explored with respect to practical engineering examples.The results are achieved as follows: The relationships of the physical quantities of the structures and parts of the bridge,tunnel and surrounding rock &goil mass are analyzed with the dimensional analysis method according to the similarity theorem and in consideration of the characteristics of the bridge and tunnel connecting works the similarity criterions and constants are derived;the similarity raties of the models of bridge and tunnel structures and the mix ratios of the similar materials of surrounding rock are determined,and material tests are conducted.The introduced model test platform and test methods provide reference for model tests of the same kind.