察汗乌苏水电站坝基覆盖层土料残余变形特性

The residual deformation properties on soil materials of dam foundation overburden layers in Chahanwusu Hydropower Project

通过大型和中型动三轴试验,对新疆察汗乌苏水电站混凝土面板堆石坝坝基覆盖层土料动力残余变形特性进行了试验研究工作。根据试验研究结果和以往成果中坝基动剪应力比分布规律,初步估计,在该工程给定的地震设计烈度条件下,该坝基覆盖层不会因地震变形而发生破坏。研究成果可为深厚覆盖层地基上高土石坝的动力变形分析和安全性评价提供科学依据,为深厚覆盖层工程特性的进一步研究提供参考。

This paper describes a series of experimental study results for the residual deformation properties of soil materials of dam foundation overburden layers in Chahanwusu hydropower project under the vibratory actions with large and middle scale cyclic triaxial testing machine. According to these results and distributive law of dynamic shear stress ratio in dam foundation,it can be preliminarily estimated that the dam foundation overburden layers will not present failure state owing to the seismic deformation under the design ground motion. These results may provide the scientific bases for dynamic deformation analysis and safety estimation of high earth and rockfill dam on deep overburden layers foundation,also provide a reference for further research of project properties on deep overburden layers.