砂土流滑运动的模型试验研究
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摘要
砂土流滑发生时,大面积土体高速流动将导致巨大的人员伤亡和财产损失。流滑砂土运动距离、破坏范围的研究可以为抗震减灾提供依据。文章通过砂土流动的室内模型试验,记录了砂土在不同初始状态下的流态化运动过程。然后,选择砂土模型中的特征质点,标定其在构形图中的位置,计算并分析其应变变化情况。研究表明:砂土的流动过程可分为整体流动阶段和局部流动阶段两个阶段。随着砂土流动时间的增长,总应变逐渐增长,应变率先增加后减少。
Severe economic loss and casualty will be induced by ground flow at a high speed in large areas during sand flow.The research on the run-out process and distance of ground flow can provide useful suggestions for earthquake resistant design.Model tests on sand flow were performed to simulate the time-history of flow configurations,which can be used to analyze the relationship between kinematic deformation and time.A reference particle in the model was selected to calculate the strain development of sand.Research results have shown that: a flow process goes through two stages: overall movement and local movement;during the process,the strain increases with time gradually.Meanwhile,the strain rate increases at first and then decreases to zero finally.
Severe economic loss and casualty will be induced by ground flow at a high speed in large areas during sand flow.The research on the run-out process and distance of ground flow can provide useful suggestions for earthquake resistant design.Model tests on sand flow were performed to simulate the time-history of flow configurations,which can be used to analyze the relationship between kinematic deformation and time.A reference particle in the model was selected to calculate the strain development of sand.Research results have shown that: a flow process goes through two stages: overall movement and local movement;during the process,the strain increases with time gradually.Meanwhile,the strain rate increases at first and then decreases to zero finally.
引文
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[3]殷跃平.汶川八级地震地质灾害研究[J].工程地质学报,2008,16(4):433-444.(Yin Yueping.Re-searches on the geo-hazards triggered by Wenchuanearthquake,Sichuan[J].Journal of Engineering Geolo-gy,2008,16(4):433-444.(in Chineses))
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