Study on Liquefaction-Induced Ground Movement and Damage to In-ground Structures

液化引起的地面移动及地下结构损伤研究

基本信息

批准号：
63460158
负责人：
HAMADA Masanori
金额：
$ 3.97万
依托单位：
Tokai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

It was reported that liquefied ground had moved with a magnitude of several meters depending on geophysical conditions and caused fatal damage to in-ground structures such as foundation piles and buried pipes. These liquefaction-induced ground movement has been recognized in earthquake engineering circles as one of critical factors for the earthquake resistant design of the structures.In order to clarify the effect of the liquefaction-induced ground movement on the in-ground structures, the authors conducted experimental studies by model ground on a shaking table. Model saturated sand ground of 6.0m in length and 1.0m in depth and width was liquefied by sinusoidal excitation. Pile models which is acryl and vinyl pipes with a diameter of 1.8cm and 2.2cm were buried in the model ground. The acceleration and displacement of the ground, pore water pressure, earth pressure of liquefied soil and the stratum the model piles were measured.From this experiment it was found that the strain of the model piles was not necessarily maximum when the ground displacement reached the maximum value, which suggests the so-called "Seismic Response Displacement Method" where the ground displacement is forced to in-ground structures through the ground spring, can not be applied to the structures in liquefied soil. Based on the detailed examination of the measured results the authors reached a conclusion that the seismic loading to in-ground structure from the lateral movement of liquefied soil is similar with the drag force of the liquid flow.

据报道，根据地球物理条件的不同，液化的地面已经以数米的大小移动，并对地基桩和埋入管道等地面结构造成了致命的破坏。这些液化引起的地面运动已在地震工程圈中被认为是结构地震设计的关键因素之一。为了阐明液化诱导的地面运动对地面结构的影响，作者通过模型在摇晃桌子上进行了模型地面进行实验研究。通过正弦激发使模型的饱和砂面长度为6.0m，深度和宽度为1.0m。直径为1.8厘米和2.2厘米的丙烯酸和乙烯基管的桩模型被埋在模型地面中。测量了地面的加速度和位移，孔隙水压，液压土壤的地球压力和模型桩的地层。从本实验中发现，模型堆积的应变不一定是最大的，当地面位移达到最大值时，当地面源于地面源的位置而不是在地面上构造了构造，从而构成了所谓的“地震响应”方法，即构造的结构是构造的，该结构是构造的，该结构是构造的，该结构是建立的，即构造的构造，即构成构建的构造，即在地面上构成，即在地面上构建构造的构建，即在地面上构成构造的构造，即在地面上构成构造的构造，即在地面上构成构造的构造。液化土壤。根据对测量结果的详细检查，作者得出的结论是，从液化土壤的横向运动中的地震载荷向地面结构与液体流量的阻力相似。