岩土工程学报2023，Vol.45Issue(z2)：61-66,6.DOI:10.11779/CJGE2023S20002
含不透水软弱层的可液化场地浅埋输水管动力响应分析
Dynamic response analysis of shallowly buried water pipelines in liquefiable sites with impervious weak layers
摘要
Abstract
Due to the combined effects of special bedding structures,hydraulic barriers in impermeable layers and the formation of"water interlayers",the dynamic responses of shallowly buried water pipelines in liquefiable interlayer soil sites are complex.A series of shaking table tests on the shallowly buried water pipelines in liquefiable sites with impermeable weak layers are conducted to compare and analyze various aspects,including soil acceleration responses,development patterns of dynamic pore pressure,vertical displacements of pipelines,excess pore pressure responses at the pipe-soil interface and dynamic earth pressures on pipeline walls.The uplift mechanisms of underlying pipelines and the enhancement of anti-uplift performance in sites with impermeable layers are investigated.The results show that the differential dynamic earth pressures between the above and below pipelines are primarily responsible for pipeline uplift.Furthermore,there exists a positive correlation between the uplift rate and the differential dynamic earth pressures.The presence of impermeable layers isolates hydraulic gradients between the upper and lower sand layers within the site,reducing the differential dynamic earth pressures at both sides of the pipelines,decreasing their displacement and improving the seismic stability.Moreover,the absence or thickness of impermeable layers significantly influences the deformation patterns.The absence of an impermeable layer results in larger strains on the pipelines,accompanied by noticeable asymmetric characteristics.As the thicknesses of the impermeable layers increase,the deformations of the pipelines become more regularized.关键词
不透水软弱层/浅埋输水管道/上浮机理/动土压力差/振动台试验Key words
impervious soft soil layer/shallowly buried water pipeline/uplift mechanism/dynamic earth pressure difference/shaking table test分类
建筑与水利引用本文复制引用
胡正阳,张鑫磊,高洪梅,王志华,孙玥,高梦婷..含不透水软弱层的可液化场地浅埋输水管动力响应分析[J].岩土工程学报,2023,45(z2):61-66,6.基金项目
国家自然科学基金青年基金项目(52108324) （52108324）
国家自然科学基金面上项目(52178336) （52178336）
江苏高校"青蓝工程"中青年学术带头人项目 （）
