土质边坡震裂机制物理模拟研究

PHYSICAL SIMULATION ON GENETIC MECHNISM OF RUPTURE IN SOIL SLOPE UNDER EARTHQUAKE

为了研究地震中土质边坡(包括覆盖层边坡)在强震作用下破裂的成因机制,以"5.12"汶川特大地震为背景资料,采用震动台模拟试验进行了研究。模拟试验结果表明:斜坡震裂变形破坏与斜坡外形结构特征具有相关性。坡面转折点应力最易集中,破坏的可能性较大。震动条件下土质边坡完全破坏也具有一般性的规律,即以"一垮到底"的方式堆积于坡脚。本次震裂边坡形成机制研究初步显示了一定规律,但在地震条件下的动力响应问题还需进行更深入研究。

This paper uses the ＂5·12＂ Wenchuan earthquake as the background.It attempts to clarify scientifically and rationally the genetic mechanism of ruptures in the soil slope（including the overlay slope）under the dynamic loading of the earthquake.The aspect is examined systematically through vibration machine simulation test which belongs to the physical simulation method.The test results show the deformation and failure under the loading of earthquake have a certain correlation with the slope external structure.Stress mainly concentrated in the slope-shape turning zones,where damage can be made easily.The instability and failure Under the condition of vibration,soil slope show an general instability and failure mode that the slope collapses completely and results its debris piled at the slope toe area.Although this study reveals some regularities,the question about the dynamic response of soil slopes still needs further study.