摘要
大型振动台模型试验和计算分析结果表明,土层液化对地面运动的影响主要表现为:液化段地面运动时程在形状、幅值和频谱等方面均有很大变化;而且,当孔压比达到0.6—0.7时土层液化就开始对地面运动产生影响。此外,波的短周期成份降低甚至被滤掉,长周期成份被放大,但是这种被滤掉或放大的周期段将随各种因素而变。输入地震波特征对液化时刻或液化开始起作用的时刻有重大影响,所得结果可用以很好解释液化宏观震害现象。
The results from large scale shaking table and numerical calculations have showed that the effect of liquefied soil layer on ground motion is appeared mainly as variation in form,amplitude and spectrum of history of the ground motion and was begun when pore water pressure ratio reaches 0. 6 - 0. 7. Besides,the short period waves will be reduced and even be filtered out and in-versly,the long period waves will be amplified. The range of reduced or filtered frequency will change with various factors. The beginning time and the initial liquefaction effect time of the soil layers depend significantly on the characteristics of the input waves. The results obtained here can give a good explanation on the phenomena of earthquake damage.
出处
《地震工程与工程振动》
CSCD
北大核心
1994年第4期14-23,共10页
Earthquake Engineering and Engineering Dynamics
基金
地震学联合基金会
