随机地震荷载作用下黄土动强度的试验方法

A TEST METHOD OF DYNAMIC STRENGTH OF LOESS UNDER RANDOM SEISMIC LOADING

摘要:

本文将APPLE-Ⅱ微机与国产动三轴仪联机,对黄土试样直接施加随机地震荷载时程进行动强度试验,提出了在随机地震荷载条件下,从黄土的动应力与积累残余应变关系曲线确定动强度的动三轴试验方法。进而用这种方法做出的动强度参数对1920年海原8.5级大震所引起的回回川黄土滑坡进行了反演,反演结果与宏观震害相符合。

Abstract:

In this paper, by use of an APPLE-Ⅱ microcomputer controling a dynamic triaxial apparatus made at home, the dynamic strength tests are directly performed on a loess by employing random time histories of seismic load. The method of determining the dynamic strength of loess under the seismic loading from relation curves of dynamic stress and residual strain was presented. And then, the Huihuichuan loess landslide induced by the 1920 Haiyuan earthquake (Ms=8.5) is inverted, and the inverted result coincides with the real seismic damase.