为了研究爆炸作用下的堤坝破坏形态,基于MM-ALE法（Multi-material ALE method）对某土质堤坝的爆破试验进行了数值模拟,并对堤坝土体中的应力波传播及密度变化规律进行了分析。结果表明：利用MM-ALE模型可以再现堤坝爆炸溃决演化的全过...为了研究爆炸作用下的堤坝破坏形态,基于MM-ALE法（Multi-material ALE method）对某土质堤坝的爆破试验进行了数值模拟,并对堤坝土体中的应力波传播及密度变化规律进行了分析。结果表明：利用MM-ALE模型可以再现堤坝爆炸溃决演化的全过程,且计算结果与现场试验实测数据吻合较好。堤坝坡面及坝顶自由面附近的反射稀疏波和压缩波反复叠加作用是形成爆炸溃口的关键因素;爆炸坑洞演化相对于爆炸应力波传播具有明显的滞后性;爆后堤坝土体被分为爆腔区、压密区和原状土区三个不同的区域,坑口附近压缩带阻止了由水流冲刷引起的连续纵向下切及溃口边坡失稳坍塌引起的间歇横向扩展,局部爆炸压密对保证爆后堤坝整体稳定性具有重要作用。该研究成果可为爆破拆除土坝和堰塞坝等工程应用提供参考。展开更多
The sea bottom in front of a breakwater is scoured under the action of broken waves,and this will affect the stability of the breakwater.In this paper,the scours of sandy seabed in front of a breakwater under the acti...The sea bottom in front of a breakwater is scoured under the action of broken waves,and this will affect the stability of the breakwater.In this paper,the scours of sandy seabed in front of a breakwater under the action of broken waves are investigated experimentally.The depth and range of the scouring trough at the foot of a breakwater are studied,and the influence of open foundation-bed on scouring and depositing is also discussed.In order to apply the research results to practical projects,the scale of model sediment and the scale of scours and depositions are suggested.展开更多
In the 2011 Great East Japan Earthquake, the highway embankments were almost less damaged comparing with the past earthquakes in Japan. But the only one embankment close to the Naka Interchange at Joban Highway was da...In the 2011 Great East Japan Earthquake, the highway embankments were almost less damaged comparing with the past earthquakes in Japan. But the only one embankment close to the Naka Interchange at Joban Highway was damaged a little severely and remarkably because of two interesting phenomena. One phenomenon is the toe-sliding failure observed at the shallow soft base ground and the other one is one-side slope sliding failure. It can be seen that the increase in the degree of saturation at embankment body or the direction of the ground motion or the interaction between the strength of the base ground and the embankment body are involved in the stability of the embankment by modifying the phenomenon by analytical approach such as circular sliding method and dynamic response analysis. Through this research, some important lessons can be obtained for future seismic countermeasure of embankments.展开更多
文摘为了研究爆炸作用下的堤坝破坏形态,基于MM-ALE法（Multi-material ALE method）对某土质堤坝的爆破试验进行了数值模拟,并对堤坝土体中的应力波传播及密度变化规律进行了分析。结果表明：利用MM-ALE模型可以再现堤坝爆炸溃决演化的全过程,且计算结果与现场试验实测数据吻合较好。堤坝坡面及坝顶自由面附近的反射稀疏波和压缩波反复叠加作用是形成爆炸溃口的关键因素;爆炸坑洞演化相对于爆炸应力波传播具有明显的滞后性;爆后堤坝土体被分为爆腔区、压密区和原状土区三个不同的区域,坑口附近压缩带阻止了由水流冲刷引起的连续纵向下切及溃口边坡失稳坍塌引起的间歇横向扩展,局部爆炸压密对保证爆后堤坝整体稳定性具有重要作用。该研究成果可为爆破拆除土坝和堰塞坝等工程应用提供参考。
基金the National Natural Science Foundation of China!(No.599790 1 9)
文摘The sea bottom in front of a breakwater is scoured under the action of broken waves,and this will affect the stability of the breakwater.In this paper,the scours of sandy seabed in front of a breakwater under the action of broken waves are investigated experimentally.The depth and range of the scouring trough at the foot of a breakwater are studied,and the influence of open foundation-bed on scouring and depositing is also discussed.In order to apply the research results to practical projects,the scale of model sediment and the scale of scours and depositions are suggested.
文摘In the 2011 Great East Japan Earthquake, the highway embankments were almost less damaged comparing with the past earthquakes in Japan. But the only one embankment close to the Naka Interchange at Joban Highway was damaged a little severely and remarkably because of two interesting phenomena. One phenomenon is the toe-sliding failure observed at the shallow soft base ground and the other one is one-side slope sliding failure. It can be seen that the increase in the degree of saturation at embankment body or the direction of the ground motion or the interaction between the strength of the base ground and the embankment body are involved in the stability of the embankment by modifying the phenomenon by analytical approach such as circular sliding method and dynamic response analysis. Through this research, some important lessons can be obtained for future seismic countermeasure of embankments.
