青藏工程走廊冻土场地地震动特征初步分析
Preliminary Study on Characteristics of Ground Motion at Permafrost Sites along Qinghai-Tibet Engineering Corridor
- 防灾减灾工程学报 2019年39卷第2期 页码：201-208
- 作者机构：
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- 基金信息：国家自然科学基金项目（41701058）;中国博士后科学基金项目（2015M570490）资助
DOI：10.13409/j.cnki.jdpme.2019.02.002
中图分类号： U435-
纸质出版：2019
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[1]陈拓,马巍,穆彦虎,王建州.青藏工程走廊冻土场地地震动特征初步分析[J].防灾减灾工程学报,2019,39(02):201-208.
陈拓, 马巍, 穆彦虎, et al. Preliminary Study on Characteristics of Ground Motion at Permafrost Sites along Qinghai-Tibet Engineering Corridor[J]. 2019, 39(2): 201-208.
[1]陈拓,马巍,穆彦虎,王建州.青藏工程走廊冻土场地地震动特征初步分析[J].防灾减灾工程学报,2019,39(02):201-208. DOI： 10.13409/j.cnki.jdpme.2019.02.002.
陈拓, 马巍, 穆彦虎, et al. Preliminary Study on Characteristics of Ground Motion at Permafrost Sites along Qinghai-Tibet Engineering Corridor[J]. 2019, 39(2): 201-208. DOI： 10.13409/j.cnki.jdpme.2019.02.002.
摘要
在分析青藏工程走廊冻土波速基本特征基础上
结合室内动三轴有关冻土动力学特性的试验结果
考虑不同超越概率的人造地震荷载作用
对青藏高原多年冻土场地地震动特征进行分析。冻土场地地震反应计算考虑了气候变化和工程活动引起多年冻土温度升高、活动层厚度增大的背景
分别对不同冻土场地条件地震动特征进行分析
明确了活动层厚度、融冻状态及冻土层厚度等因素对冻土场地的加速度放大效应、地基土应变及反应谱特征周期变化特征。研究结果表明
尽管地表峰值加速度放大系数随活动层厚度增加而增加
然而活动层土体厚度及状态的变化不足以改变场地的固有特性
对场地特征周期影响不明显。场地的固有特性随着冻土层厚度的变化而发生变化
冻土层厚度对地震动放大效应的抑制作用随着输入地震荷载的增大越为明显。冻土层厚度对场地特征周期值影响较大
场地特征周期随着冻土层厚度增加呈对数增大趋势。
Abstract
Based on the analysis of elementary characteristics of wave velocities of soils at the permafrost sites along Qinghai-Tibet Engineering Corridor
combining the results of dynamic triaxial test
using three time histories of ground motion acceleration with different exceedance probabilities related to the research area
the characteristics of ground motion are analyzed to estimate the amplification effects of permafrost areas
as well as the seismic response of frozen soil ground.Considering the influence of the global warming and engineering activities
the change of the active layer and the variety of permafrost thickness are taken into account in the numerical calculation.The research results show that the influence of the active layer thickness is not significant despite the ground peak acceleration increases with active layer thickness
the changes of the active layer are not enough to alter the inherent characteristics of permafrost sites
the active layer thickness has little influence on the characteristic site period.The results also indicate that the permafrost thickness has an obvious influence on the site effect and the sites with large permafrost thickness have no amplification effect on the ground motion.The inhibitory effects are more obvious with higher intensity of the input ground motion.The permafrost thickness has a significant impact on the characteristic site period.The characteristic site period gradually increases with the increase of the permafrost thickness
showing a logarithmic relationship.
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references
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