摘要
波浪会对海床产生反复的作用力,由此引起的土体颗粒间孔隙水压力变化是造成土体液化的主要原因。使用自行研发的孔压监测设备,对黄河口埕岛海域易液化区海底孔压进行了长时间、高精度的观测,并对孔隙水压力、波高以及潮位间的关系进行分析。监测结果显示,本次监测条件下波浪最大作用深度介于0.5~1.5m之间,超过该作用深度后孔压无明显变化。土体内部孔隙水压力的变化主要由潮位和波高决定,潮位的作用可使孔压缓慢平滑的变化且对超孔压无影响;波高的作用可使孔压快速、剧烈地振荡并导致超孔压的出现。
Variation of pore pressure between soil particles, which caused by the cyclic loading from waves to seabed,is the main reason for soil liquefaction. By using a self-designed pore pressure monitoring equipment, we monitored pore pressure with a long-period, high-precision way in the easy-liquefied zone in Chengdao sea area of Yellow River Estuary. The monitoring results show that the maximum wave-affected depth is between 0.5 m to 1.5 m and no obvious pore pressure response in the deeper sediment during this period. Pore pressure variation in soil is mainly determined by tide level and wave height. Tide level changes can result in smooth change in pore pressure but can not cause the emergence of excess pore pressure while wave height changes can result in severe oscillation in pore pressure and lead to the appearance of excess pore pressure.
作者
杜星
孙永福
宋玉鹏
赵晓龙
周其坤
Du Xing;Sun Yongfu;Song Yupeng;Zhao Xiaolong;Zhou Qikun(First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China;Laboratory for Marine Geology and Environment,Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266235, China)
出处
《海洋学报》
CAS
CSCD
北大核心
2019年第7期116-122,共7页
基金
国家海洋公益性行业科研专项(201005005)
国家重点研发计划项目(2017YFC0307305)
关键词
埕岛海域
波致孔压
孔压监测
粉土液化
Chengdao sea area
wave-induced pore pressure
pore pressure monitoring
silt liquefaction
