地震序列对砂土液化场地条件影响的试验研究
Experimental study on the influence of earthquake sequences on the conditions of sand liquefaction sites
李金宇 1王伟 1王浩宇 1齐亚坤 1张晓庆 1赵梦瑶2
作者信息
- 1. 防灾科技学院 地质工程学院,河北 廊坊 065201
- 2. 中国地质大学 工程技术学院,北京 100083
- 折叠
摘要
地震序列作用下砂土液化和再液化趋势研究,对于工程场地的地震地质灾害评价具有重要意义.通过振动台试验,分析模拟地震序列作用下多次液化后场地条件的变化情况.基于试验过程中各类传感器的采集记录,结合轻型动力触探测试和液化前后的土工试验数据,得到场地模型土层振动液化过程中孔隙水压力、土压力、加速度、土壤含水率和土体相对密实度的变化规律.结果表明,在模拟地震序列作用下,随着振动次数的增加,相同深度的砂土密实度显著增加,增量逐渐变小,孔压增量逐渐降低;而不同深度的砂土密实度和孔压增量由深部到浅部逐渐降低,导致深部砂土的液化势显著低于浅部砂土.
Abstract
The research on the liquefaction and reliquefaction trend of sand under the action of earthquake sequence is of great significance for the evaluation of seismic and geological disasters at engineering sites.Through the shaking table test,the changes in site conditions after multiple liquefaction under the action of a simulated earthquake sequence are analyzed.Based on the data collected and recorded by various sensors during the test,combined with the light dynamic penetration test and the geotechnical test data before and after liquefaction,the variation laws of pore water pressure,earth pressure,acceleration,soil moisture content,and relative compactness of soil in the process of site model soil liquefaction are obtained.The results show that under the action in simulated earthquake sequence,with the increase of vibration times,the sand compactness at the same depth increases significantly,the increment decreases gradually,and the pore water pressure increment decreases gradually.However,the sand compactness and pore water pressure increment at different depths gradually decreased from deep to shallow,resulting in the liquefaction potential of deep sand being significantly lower than that of shallow sand.
关键词
地震序列/砂土液化/密实度/孔隙水压力/轻型动力触探测试Key words
earthquake sequence/sand liquefaction/compactness/pore water pressure/light dynamic penetration test引用本文复制引用
基金项目
中央高校基本科研业务费研究生科技创新基金项目(ZY20230307)
中国地震局地震科技星火计划项目(XH23062A)
出版年
2024
NETL
NSTL
万方数据