地震时黄土震陷量的估算方法

本文利用已有的震陷试验研究资料,并补充进行了相当数量的原状黄土的震陷试验。建立了考虑物性参数、固结应力、振次和地震动应力等因素的西北黄土残余应变的经验计算公式,提出了地震作用下黄土层震陷量的估算方法.并用该方法估算了兰州、西安、西宁、等城市的7个黄土场地的震陷量,给出了每一场地的震陷量随地震动加速度的变化曲线.从而为黄土地区的地震灾害预测预防和地基抗震设计研究提供了一种定量方法.

A METHOD OF ESTIMATING THE QUANTITY OF SEISMIC SUBSIDENCE IN LOESS DEPOSITS DURING EARTHQUAKES

Based on the data of the laboratory research in the seismic subsidence in the past,in ad-dition to a lots of seismic subsidence tests performed on undisturbed loess samples by the au-thors,an empirical formula of evaluating the residual strain in loess was developed involvingin following factors parameters of physical properties,consolidating stress,vibration timesand dynamic seismic stress.A method of estimating the quantity of seismic subsidence inloess deposits under the effect of an earthquake was presented.And then,the quantities ofseismic subsidence on seven loess sites in Lanzhou,Xian and Xining cities were estimated bythis method.The estimated results were expressed as the curves of seismic subsidence vary-ing with acceleration of ground motion.Thus,a quantitative method is provided for predic-tion and prevention of earthquake disaster and study of seismic design of ground in loessarea.