基于振动台实验的典型滑坡单元体震动滑移特征发现

针对典型滑坡滑动单元在地震过程中的滑移特征,制作了典型振动台物理模型,通过输入不同频率、峰值和持时的正弦地震波,开展了一系列的实验研究工作,得了一些比较有意义的新成果:(1)在输入地震波强度足够大时会出现瞬时沿滑带向上的滑移行为,存在向上和向下两个滑移屈服加速度;(2)在研究分析中,不可以坡底输入的地震加速度值而应以滑带处局部加速度值作为判别滑移与否和滑移量大小的计算数据;(3)滑体沿滑带产生的永久滑移总量随地震波持时增加呈阶梯波状增长;(4)不同时刻任一周期的振动滑移特征相对独立,且每一地震波周期时间内具有几乎相同的周期性滑移特征,总体滑移量是无数周期内滑移量的累加;(5)在每一地震波周期时...

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Bibliographic details
Volume: 45
Main Author: 钱海涛;肖锐铧
Format: Journal Article
Language: Chinese
Place of publication: 中国地震局地壳应力研究所,北京,100085%国土资源部地质灾害应急技术指导中心,北京,100081 2018
published in: 水文地质工程地质 Vol. 45; no. 2; pp. 64 - 69
Data of publication: 2018
ISSN: 1000-3665
Alternate Title: New results of the slid characteristics of a typical earthquake landslide model based on shake table tests
Classification Codes:
Bibliography: typical earthquake landslide model; shake table tests; yield acceleration; slid characters
In order to examine the slid characteristics of the typical landslide model triggered by strong earthquakes,physical models for shake tables are created and a series of tests are conducted by inputting sine seismic waves with different frequencies,duration and peaks. The following five interesting findings are obtained from the tests.(1) The slid-body may slide not only downward but also upward along the slid-belt when undergoes a strong shake wave and two yield accelerations(the downward and upward yielding acceleration) exist.(2) The data for slid analysis should be the local acceleration close to the slid-belt other than the acceleration at the bottom of the landslides model.(3) With time growing,the overall displacement of the slid-body along the slid-belt accumulates with the characteristics of the stepped wave in shake-table testes.(4) The slid characteristics of different wave periods are independent of each other
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