离心场中陡倾顺层岩质边坡振动试验关键技术研究

为解决离心场中陡倾顺层岩质边坡振动试验的关键技术问题,设计了陡倾顺层斜坡的离心振动台模型,通过试验探讨了试验仪器设备的关键技术参数、动力相似关系、相似材料比选以及传感器的安装布置等内容,并确定了地震波的加载方案。同时为了得到可靠的试验结果,分析了离心力场中的误差、传感器的安装与误差问题和边界效应问题,结合以往经验对误差方法进行比选,并提出了相应的减小误差的方法。研究结果表明离心振动台模型试验要进行合理的设计;离心力场中的系统误差可通过设计模型尺寸大小和选择模拟模型和原型应力保持一致的高度来减小;传感器测量误差可采用在传感器周围填充满砂土来减小;多层剪切层铝合金框架模型箱能够最大程度减小边界效应的影响。

Key Technologies of the Vibration Test of SteepBedding Rock Slope in Centrifugal Field

Through the design of centrifugal vibration table model test of steep dip bedding rock slope, the key technical parameters of test apparatus, the dynamic similarity relations, the selection of similar materials and the installation and arrangement of sensors are discussed.The loading scheme of seismic wave is also determined.Moreover, through analyzing the errors in centrifugal field and sensors installation as well as boundary conditions, corresponding measures of reducing the errors are put forward based on comparison with previous experiences.Results suggest that centrifugal shaker table test should be designed rationally;system error in the centrifugal force field could be diminished as the model size and stress are consistent with those of the prototype;error of sensors could be reduced by filling sand around sensors;aluminum-alloy frame model box with multiple shear layers could reduce boundary effect to the largest extent.