| 土石坝振动台模型试验颗粒流数值模拟分析 |
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| 引用本文： | 刘汉龙,杨贵.土石坝振动台模型试验颗粒流数值模拟分析[J].地震学刊,2009(5):479-484. |
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| 作者姓名： | 刘汉龙 杨贵 |
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| 作者单位： | 河海大学岩土力学与堤坝工程教育部重点试验室、河海大学岩土工程科学研究所,南京210098 |
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| 基金项目： | 国家杰出青年科学基金项目（50825901）、国家自然科学基金雅砻江水电开发联合研究基金项目（50639050）、水利部公益性行业科研专项经费项目（200801014）资助 |
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| 摘 要： | 目前一般采用振动台试验、离心振动台试验和有限元动力分析来获得土石坝在设计地震荷载作用下的形态和抗震性能。本文结合孔宪京等的土石坝振动台试验结果开展了颗粒流细观数值模拟研究,克服了传统连续介质力学的宏观连续性假设,形象而直观地表现出坝体在动力荷载作用下的破坏特征。数值模拟规律与振动台试验规律基本一致。同时还分析了坝体颗粒粘结强度和地震峰值加速度变化对坝体破坏特征的影响。数值结果表明,当颗粒间粘结强度较低时,表现为坝体表面颗粒的滑动破坏,粘结强度稍大时,会出现局部的小块颗粒团整体滑动破坏;随着峰值加速度的增大,坝顶沉降量在增大,坝体破坏特征不变。
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| 关 键 词： | 土石坝 振动台试验 破坏特征 二维颗粒流程序(PFC2D) 数值模拟 |
PFC^2D Numerical Analysis of Model Testing of Earth and Rock-Fill Dam on Shaking Table |
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| LIU Han-long,YANG Gui.PFC^2D Numerical Analysis of Model Testing of Earth and Rock-Fill Dam on Shaking Table[J].Journal of Seismology,2009(5):479-484. |
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| Authors: | LIU Han-long YANG Gui |
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| Institution: | (Key Laboratory for Ministry of Education for Geomechanics and Embankment Engineering, Geotechnical Research Institute, Hohai University, Nanjing 210098, China) |
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| Abstract: | The shape and seismic behavior of earth rock-fill dam mulated by shaking table test, shake table for the centrifuge under designed seismic load are usually sitest and finite element dynamic analysis. Mesomechanical simulation was analyzed based on the shaking table test in Reference1], which overcomes the deficiency of macro-continuity assumption in continuum mechanics and can demonstrate the failure characteristics of dam under dynamic loading intuitively and vividly. The law obtained from numerical simulation is almost consistent with the one obtained from the shaking table test. Besides, the influencing factors of bond strength of particle and peak acceleration of seismic wave on the characteristics of damage in the dam were analyzed. The simulation results indicate that the failure characteristics of dam are particle sliding on the dam surface with very low bond strength and particle cluster sliding on the dam surface with slightly higher bond strength. With the increase of peak acceleration, the settlement of dam crest is becoming larger, but the failure characteristics of dam remains unchanged. |
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| Keywords: | earth and rock-fill dam shaking table test failure characteristics Partical Flow Code in 2 Dimensions（PFC2D） numerical simulation |
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