高地震烈度区坝基砂层的动力学特性研究

Study on Dynamic Characteristics of Sand Layer in Dam Foundation in High Earthquake-intensity Area

下坂地水库位于帕米尔高原腹地,具有高海拔、高地震烈度,以及古冰川及新冰川活动频繁等特点。河床覆盖层厚度达150 m,其中坝基下存在砂层,其力学性质差。工程区地震设防烈度8.5度,对坝基砂层液化可能性进行评判及处理措施等,都有很大的难度。以下坂地坝基砂层液化问题研究为例,对砂层的勘察、动力学特性的试验分析研究加以总结。

The Xiabandi Reservoir is located at the hinterland of Pamirs,which possesses the characteristics of high altitude,high earthquake intensity and frequent activities of ancient and new glaciers.The thickness of the river bed cover is 150 m,among them there is sand layer in dam foundation with poor mechanical properties.The seismic intensity of project area is 8.5,so it is very difficult to evaluate liquefaction possibility and take measures for the sand layer.In this paper,the sand layer liquefaction in dam foundation of the Xiabandi Reservoir had been taken as an example,investigation and dynamic characteristics of the sand layer have been summarized.