摘要
土石坝振动台模型试验是认识坝体地震破坏过程和检验抗震措施效果的重要手段之一。针对2种坝体材料,利用小型振动台,开展了一系列不同加载工况、不同加筋方式的土石坝小型振动台模型试验。试验结果表明:①2种坝体材料的初始破坏都首先从坝顶开始,表明坝顶是抗震的关键部位,与已有研究成果基本一致;②相同加载条件下,级配较差的碎石料模型坝的抗震性能优于砂砾石料,表明相对于级配,堆石料自身的性质对土石坝抗震性能的影响更大;③由细铁丝网和纱布组成并在坝坡采取包裹处理的复合加筋的抗震措施,抗震效果优于平铺纱布、平铺纱布且在坝坡包裹处理、平铺细铁丝网等的抗震措施。研究成果可供进一步开展土石坝大型振动台模型试验的材料选择、抗震措施设计等参考。
The shaking table model test of earth-rockfill dam is one of important way to recognize the earthquake damage process and test the effects of seismic measures for dams. In this paper, a series of small scale shaking table model tests were carried out by using two different materials under different loading and reinforcement conditions. The results show that： （1） The initial dam- age of model dams of two different materials both start from the top of the dams,which indicates that the top of the dam is the key part of the seismic design, this is in line with existing research basically. （2） Although the broken stones have a poor gradation, its model dams are superior to the sandy gravels ones under the same loading conditions, it indicates that the properties of rock- fill materials have a larger influence on the earthquake resistance of dams. （3） Seismic measure composed of fine steel mesh-gauze and wrapping at the dam slope is superior to other measures such as spread flat gauze, spread flat gauze and wrapping at the dam slope, spread flat fine steel mesh. The research provides reference basis for the resistant design and choice of materials of large-sized shaking table model tests.
出处
《防灾减灾工程学报》
CSCD
北大核心
2014年第1期124-128,共5页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(U1134207
51109068)资助
关键词
加筋土石坝
振动台
模型试验
抗震性能
reinforced earth-rockfill dam
shaking table
model test
earthquake resistance behavior
