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加筋措施在土石坝的抗震加固中得到了较为广泛的运用。采用高精度的大型动力三轴仪,对两河口土石坝加筋堆石料的动力残余变形特性进行了试验研究,探讨了围压、循环荷载条件及加筋间距等对堆石料动残余变形的影响。试验结果表明:在循环荷载作用下,加筋堆石料与素堆石料的残余变形的发展规律基本一致,但加筋后堆石料的残余变形变小,且随加筋层数增加残余变形的降低愈明显。因此,扩大加筋范围、减少加筋间距是减小地震永久变形,提高抗震稳定性的有效工程措施。还根据试验结果,初步探讨了加筋对动残余变形影响的机理。
Reinforcing measures in the earth-rock dam aseismic reinforcement has been more widely used. The dynamic residual deformation characteristics of rockfill dam reinforced with rockfill dam were studied by using high-precision large-scale dynamic triaxial apparatus. The influence of confining pressure, cyclic loading conditions and reinforcement spacing on the residual deformation of rockfill dams was discussed . The experimental results show that under the cyclic loading, the development law of residual deformation of the reinforced rockfill material and the rockfill material is basically the same, but the residual deformation of the rockfill material becomes smaller after the reinforcement and the residual deformation decreases with the increase of the reinforcement layer The more obvious. Therefore, enlarging the reinforcement range and reducing the reinforcement spacing is an effective engineering measure to reduce the permanent deformation of the earthquake and improve the seismic stability. According to the experimental results, the mechanism of the influence of the reinforcement on the residual deformation is also discussed.