针对地震中破坏严重的村镇低层房屋结构，提出土工加筋橡胶砂复合垫层隔震方法。用橡胶砂、土工格室和土工格栅构造厚度为200 mm、填料配比为30%的加筋橡胶砂复合垫层，考虑粗砂和细砂两种砂粒径的橡胶砂，在3种基底压力（50 kPa, 100 kPa, 150 kPa）、3种地震波输入加速度（El Centro 0.1g, 0.2g, 0.3g）下进行振动台试验。结果表明：加筋橡胶砂复合垫层具有良好的隔震效果，减震系数随着基底压力和输入加速度的增大而减小；砂粒径大的复合垫层隔震效果更好，减震系数受基底压力和输入加速度的影响更大；与已有文献对比发现，加筋橡胶砂复合垫层的隔震效果整体优于纯橡胶砂垫层，可作为农村低层房屋隔震的一种可行方法。
Abstract
Aiming at the low-rise housing structures in villages which were damaged seriously in the earthquake, a new reinforced rubber sand mixture composite cushion (GRSMCC) was proposed. A kind of 0.2 meter thickness cushion was constructed by use of geocell, geogrid and RSM with rubber mass content of 30 percent. Shaking table tests were carried out taking into account two kinds of river sand, coarse or fine, three kinds of foundation pressure, 50 kPa, 100 kPa, 150 kPa, and three kinds of seismic wave input acceleration, El Centro 0.1g, 0.2g, 0.3g. The test results indicate that the GRSMCC acts well as a base isolator, and the isolation coefficient decreases with the increase of the foundation pressure as well as input acceleration. The GRSMCC with the river sand of big size has better seismic isolation effect, and the isolation coefficient is more affected by the foundation pressure and input acceleration. Compared with the references in literatures， it is found that the isolation effect of GRSMCC is better than that of pure rubber sand mixture cushions, which can be used as a feasible method for the seismic isolation of rural low-rise houses.
关键词
加筋橡胶砂 /
复合垫层 /
隔震 /
振动台试验 /
减震系数
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Key words
reinforced rubber sand mixture /
composite cushion /
isolation /
shaking table test /
isolation coefficient
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