【摘要】 讨论了南水北调工程大型穿黄隧道砂基在施工期和运行期产生液化的可能性及液化深度问题。砂土动力试验采用了原状样和扰动样 ,从微观结构和动力特性分析了两种试样成果的差别 ,并对 7度地震下砂基液化的可能深度作了判定。对砂土加密后的抗液化性能的提高进行了试验 ,还对盾构机施工时的振动加速度进行了实测 ,并探讨了施工时砂基液化的可能性更多还原

【Abstract】 In the project of water transferring from south to north of China (middle route), there are two large tunnels installed in the sand layers under the Yellow River bed. This paper deals with the problems of possible liquefaction and the depth of influence for these sand layers under 7 degree earthquake. The samples for dynamic tests are disturbed and undisturbed, which are taken from tunnel site by drilling.The depth of liquefaction in sand layer is estimated using different method. The anti liquefaction property for the sand sample compacted to higher density is also investigated. Finally, the vibrating acceleration of shield machine is measured to discuss the possibility of liquefaction during construction.更多还原