土工格栅加筋高土石坝的动力弹塑性分析
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摘要
在高土石坝动力反应特性的基础上,建立了土工格栅加筋高土石坝的弹塑性分析模型,并利用该模型对土工格栅加筋高土石坝的受力情况、变形和破坏机理进行研究,分析了土工格栅的连接方式、长度、刚度以及铺设间距等参数对高土石坝变形的影响。计算结果表明:选择模量高、延伸率适宜的土工格栅对减少坝顶的位移和提高坝体的稳定性具有明显效果;土工格栅所受内力从下往上逐渐减小,最大内力出现在底层;当格栅长度超过潜在滑裂面一定长度后,再增加格栅长度对永久位移的影响已不明显。研究结果可以为实际工程设计提供参考。
Based on the dynamic response of high earth-rockfill dam, an elastic-plastic analysis method for the slope of high earth-rockfill dam reinforced with geogrids has been established. The mechanics behavior, deformation and failure mechanism of high earth-rockfill dam which reinforced with geogrids were analyzed. The connection between geogrids, the length, the spacing and the stiffness on the deformation of the high earth-rockfill dam were discussed. The results show that the deformation of the high earth-rockfill dam could be reduced by geogrids with higher elastic modulus and proper extensibility and the stability of slope would be improved. In addition, the internal force of geogrids decreased gradually from the top to down and the largest occurred at the bottom. When the geogrid is longer than a certain length of the potential slip surface, the increasing of the permanent displacement is not very obvious. These results can be used as a reference for future study and design of geogrid reinforced in high earth-rockfill dam.
Based on the dynamic response of high earth-rockfill dam, an elastic-plastic analysis method for the slope of high earth-rockfill dam reinforced with geogrids has been established. The mechanics behavior, deformation and failure mechanism of high earth-rockfill dam which reinforced with geogrids were analyzed. The connection between geogrids, the length, the spacing and the stiffness on the deformation of the high earth-rockfill dam were discussed. The results show that the deformation of the high earth-rockfill dam could be reduced by geogrids with higher elastic modulus and proper extensibility and the stability of slope would be improved. In addition, the internal force of geogrids decreased gradually from the top to down and the largest occurred at the bottom. When the geogrid is longer than a certain length of the potential slip surface, the increasing of the permanent displacement is not very obvious. These results can be used as a reference for future study and design of geogrid reinforced in high earth-rockfill dam.
引文
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[6]李红军.高土石坝地震变形分析与抗震安全评价[D].大连:大连理工大学,2008.
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[11]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.
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