土-地铁隧道动力相互作用的大型振动台试验:试验方案设计

A large-scale shaking table test for dynamic soil-metro tunnel interaction:test scheme

以南京地铁的建设背景为基础,对含有可液化土层的深厚软弱场地上双洞单轨的地铁区间隧道结构进行了大型振动台模型试验研究。根据本次试验的目的和特性,首先给出了模型体系相似比的设计基本原则,并对整个模型体系进行了相似设计,对模型土和模型结构的制备方法和模型材料的物理特性进行了室内试验研究,同时,根据对隧道地震反应分析的数值模拟结果,对传感器的选择及其布置方案进行了分析。最后,根据南京及其周边地区的地震环境,对台面输入地震动的选取及其加载方法进行了具体的阐述。试验结果表明本文对土-地铁区间隧道动力相互作用的大型振动台模型试验的设计方案是合理的,对相关试验结果的整理和分析见另文。

Based on the background of metro construction in Nanjing city, a large-scale shaking table test is accomplished to model the dynamic soil-tunnel interaction with liquefiable soils included in site. According to the aim and characteristic of test, the essential rules used to supervise the scale ratio design of test are formulated and the scale relations and the ratio of model system are deduced. How to prepare the model soils and to build the model structure are studied. Physical characteristics of model soils and micro-concrete are given by lab tests. According to the earthquake response characteristic of metro tunnel calculated by finite-element method, arrangement plans of sensors are made. At last, three waves of earthquake ground motion are selected as inputs and loading conditions are set out by considering the earthquake environment of Nanjing city. Test results prove that the shaking table test scheme for dynamic soil-metro tunnel interaction is reasonable. Analysis of the test results will make in another paper.