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为了解大型地下洞室群在地震过程中的动态响应特征,以大渡河流域的大岗山水电站大型地下洞室群为原型,开展地震模拟振动台物理模型试验研究。作为国内外首次进行此类振动台试验研究,系统介绍整个试验的方案设计。首先,根据本次试验的目的和特性,给出试验基本简化原则,并对模型体系进行相似设计,按照完全相似模型推导出各物理量的动力相似常数、确定模拟范围、模型尺寸和相似材料配比。然后,对试验边界条件进行设计,确定了作为柔性边界的聚苯乙烯泡沫板的材料和几何参数,制作了用于测量围岩内部应力的应变砖传感器,并介绍模型制作、洞室成型与开挖等工艺步骤;最后,确定试验输入波形,并按相似理论要求进行调整,给出模型试验的加载工况。经后期试验数据的分析,证明试验条件简化合理,模型设计与制作成功。一整套模型设计方法与制作工艺,可供今后类似试验作为参考。
In order to understand the dynamic response characteristics of large-scale underground caverns in the process of earthquakes, taking the large-scale underground caverns at Dagangshan Hydropower Station in Dadu River basin as the prototype, the physical model test of shaking table of seismic simulation was carried out. As the first time for such shaking table test research at home and abroad, the system design of the entire test program. First of all, according to the purpose and characteristics of this test, the basic simplified principle of experiment is given, and the model system is designed similarly. The dynamic similarity constant of each physical quantity is deduced according to the exact similarity model. The simulation range, model size and the ratio of similar materials . Then, the experimental boundary conditions were designed to determine the material and geometrical parameters of the polystyrene foam board as a flexible boundary. A strain brick sensor for measuring the internal stress of the surrounding rock was made. The model making, cavity forming and opening Digging and other process steps; Finally, determine the test input waveform, and adjusted according to similar theoretical requirements, given the model test load conditions. The analysis of post-test data proves that the test conditions are simplified and reasonable, and the model design and production are successful. A set of model design methods and production processes for future similar tests as a reference.