黄土地基震陷变形量的计算

THE CALCULATION OF SEISMAL SINKAGE DEFORMATION FOR LOESS FOUNDATION

本文概述了黄土试样的震陷变形与土体特性之间的关系.通过分析前人计算地震引起的土层永久变形诸方法,结合黄土在地震作用下的变形特点,提出了计算黄土地基震陷变形量的计算方法,编写了计算程序,在兰州市区选择了一条剖面,进行了计算,计算结果与宏观分析一致.

It is necessary to study the characteristics of seismo-sinkagc deformation of loess foundation in the delimitation of seismic damage of the constructional sites in the loess regions, through analysing the damaged types of buildings after earthquake and the deformational characteristics of the foundation in the loess regions. Depending on the micro-constructional variation of loess specimen, the reasons and process of the sinkage deformation of loess after earthquake are analysed. Through laboratory experiments, it is analysed the relationship between the sinkage strain of the loess specimen with void ratio, water content, dry specific gravity, stress history, stress value of consolidation, amplitude of dynamic stress and cyclic number of the dynamic stress. Depending on the results of the vibrant sinking experiments, using the method of statistics, it is built up the relationship between the sinkage stain of the specimen with the amplitude of the dynamic stress and the cyclic number of the dynamic stress, the pattern of the sinkage deformation curve is also determined. Through analysing the methods of calculating the permanent deformation caused by earthquake, it is put forward the method of calculating the seismo-sinkage deformation of the loess foundation, after chosing a section in LANZHOU, using the method and compiling aprogram, the seismo-sinkage deformation is calculated.