表面倾斜可液化地基变形特性振动台试验研究  

Shaking table tests on deformation properties of the cone-shaped liquefaction foundation

作　　者：陈继华[1] 庄海洋[2] 王伟 

机构地区：[1]石家庄经济学院勘查技术与工程学院,石家庄050031 [2]南京工业大学岩土工程研究所,南京210009 [3]武警石家庄士官学校,石家庄050061

出　　处：《工程勘察》2013年第8期6-10,29,共6页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金(51278246;50808100)

摘　　要：针对砂土液化诱发的地表震陷和地面侧向移动等地震破坏现象,开展了表面倾斜角度为3°、6°、9°的不同可液化地基变形特性的振动台模型试验,测试分析了该类型场地地表竖向变形和侧向大变形的规律及地基孔压分布。研究结果表明:表面倾斜角度为3°、6°时,地基液化时砂土层表层发生了明显的顺坡流动现象,造成砂土层埋深较浅的一侧地基表面下沉和埋设较深的一侧地基表面抬升,大大加剧了液化地基表面的不均匀震陷;表面倾斜角度为9°工况下,底部可液化土层可能发生局部液化现象,未出现液化土层表层的流动和瞬间滑移现象,但为了释放地基内积聚的孔压,在上覆土层较薄一侧地基产生喷砂冒水等严重震害,造成地面表面局部范围的较大震陷。Based on the seismic damaging phenomenon such as the liquefaction-induced settlement and ground lateral movement, a series of shaking table tests are completed by considering the different surface tilt degrees of the cone-shaped liquefaction foundation with 3°, 6°and 9°respectively. With the respect to the test results, the following characteristics are discussed such as the surface vertical deformation, lateral deformation and dynamic pore water pressure. As the results, the downhill liquefaction flow phenomena are very obvious with the surface tilt degrees being 3 and 6 when the foundation is liquefied. At the shallow side of the sand layer, the ground surface settlement takes place obviously and the ground surface uplifts at another side of the foundation. In addition, with the surface tilt degree being 9 degrees, for the thickness of the overlaying soil layer being large, the downhill flow phenomena does not take place. However, in order to release the dynamic pore pressure accumulated in the foundation, the sand boil and other serious seismic damaging phenomena have taken place at the thinner overlaying soil layer which gives rise to more earthquake-induced settlement.

关 键 词：砂土液化 倾斜地基 振动台试验 地基变形 

分 类 号：TU435[建筑科学—岩土工程]