| 滑带土动力学性质试验研究 |
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| 引用本文： | 晏鄂川,刘汉超,唐辉明.滑带土动力学性质试验研究[J].工程地质学报(英文版),2003,11(3):318-322. |
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| 作者姓名： | 晏鄂川 刘汉超 唐辉明 |
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| 作者单位： | 1.中国地质大学,武汉430074; |
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| 摘 要： | 为了研究地震高烈度区老滑坡的复活变形原因,本文对滑坡滑带土的动力学特性进行了系列研究。本次试验采用扰动土样,制样基本物理指标按滑带土的现场测试指标确定,在不固结不排水条件下,运用MTS810Teststar程控液压伺服土动三轴仪对单个样品逐级放大动应力的分级试验方法进行。侧向压力 (围压 )分别采用 100kPa、20 0kPa、300kPa三级,通过施加轴向振动荷载 (力 )模拟地震作用,振动波形为正弦波,频率为 1Hz,振幅随试样性质确定。研究结果表明,滑带土在动荷载作用下的动力学性质与其静荷载作用下的力学性质有着较大的差异,主要表现在滑带土的动应力与动应变关系的非线性、滞后性及变形积累特点,动弹性模量与动强度的显著降低以及动阻尼比的显著增大特性。这揭示了动力作用下的滑坡复活原因之一,同时为滑坡稳定性评价和动力作用下的变形机制模拟分析提供了基础资料,也为分析滑带土动力本构模型提供了基本内容。
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| 关 键 词： | 滑带土 动力学特性 动弹性模量 阻尼比 动强度 |
| 文章编号： | 1004-9665/2003/11(03)-0318-05 |
| 收稿时间： | 2002-12-20 |
| 修稿时间： | 2002年12月20 |
EXPERIMENTAL STUDY ON THE DYNAMIC PROPERTIES OF SOIL IN SLIDE ZONE OF LANDSLIDE |
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| Institution: | 1.Engineering Faculty, China University of Geosciences, Wuhan 430074;2.Chengdu Institute of Technology, Chengdu610059 |
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| Abstract: | In order to study the deformation cause of reactivated landslide in a high seismic intensity area, the authors firstly systematically analyze the dynamic properties of soil in slide zone in cyclic triaxial test . The disturbed soil samples, physical properties of which are prepared to be field test index are tested on triaxial compressor under unconsolidated-undrained condition , with confining pressure of 100kPa, 200kPa and 300kPa and a step by step increasing dynamic load. Analyzing the environmental condition of the landslide in combination with high seismic intensity in the region, the seismic response properties of soil in slide zone are systematically sdutied. The result shows that there is a lot of difference between the dynamic and the static properties, for example, the nonlinear relation between dynamic stress and strain, dynamic elasticity modulus and dynamic strength of the soil markedly reduce, but damping ratio increases. The study provides an important theoretical basis for evaluating the sliding of the landslide. |
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| Keywords: | The slide zone Dynamic property Dynamic elasticity modulus Damping ratio Dynamic strength |
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