三峡库区塌岸的物理模拟研究

PHYSICAL MODELLING FOR EXAMINATION OF BANK COLLAPSE IN THREE GORGES AREA

三峡水库正常蓄水以后,涉水岸坡岩土体内部的地下水动力场和应力场都将发生较大的改变,再加上库水位变动、风浪侵蚀以及暴雨等外部营力作用,岸坡稳定性将发生显著变化,并可能导致塌岸的发生。为了研究三峡水库的塌岸模式和成因机理,本文在查明三峡库区塌岸工程地质条件的基础上,采用物理模拟手段,利用正交设计原理,分析研究了塌岸模式及塌岸宽度与岸坡坡角、水位、降雨强度、土质及波浪等影响因素的关系和敏感程度。

After the Three Gorges dam begins its full functions, the fields of stress and dynamics of ground water in the soil and rock mass will have great changes. If other external agents such as change of water level, erosion of wind wave and rainstorm emerge, the stability of the bank slopes will be changed too. It even can cause banks to collapse. In order to research the modes of the bank collapse and the formation mechanism, this paper develops the conditions of geology and climate of the Three Gorges in a model test. Then, using the method of physical modelling and the principle of orthogonal design, this paper develops the relations and sensitivity between the pattern and width of bank collapse and factors including slope angle, water level, rainfall intensity, earthiness and wave.