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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。
Aiming at the earthquake damage induced by sand liquefaction, such as surface subsidence and lateral movement of the ground, the shaking table model tests on the deformation characteristics of liquefiable ground with 3 °, 6 ° and 9 ° inclination angles are carried out. The regularity of surface vertical deformation and lateral deformation of the type site and pore water pressure distribution. The results show that when the inclination angle of the surface is 3 ° and 6 °, the phenomenon of obvious slope flow occurs on the surface layer of sand and soil when liquefaction occurs, resulting in the sinking and burying of the surface of the foundation on the shallow depth of sand layer , Which greatly aggravates the inhomogeneous shocks on the surface of the liquefied foundation. Under the conditions of a surface inclination angle of 9 °, local liquefaction of the liquefiable soil layer may occur locally, and the flow and moment of the surface of the liquefied soil layer do not appear However, in order to release the pore pressure accumulated in the foundation, severe ground damage such as sandblasting and water blasting occurs on the foundation on the thinner side of the overburden, resulting in large collapse of the local surface area.