摘要
液化是造成场地地震破坏的首要原因之一。自Casagrande的经典工作以来,对地震液化的研究已经取得了很大的进展。然而这些研究大多是针对于砂土而进行的,对于粉土液化研究的相对较少,且粉土的液化特性也有别于砂土。因此,在已有研究的基础之上利用粉土液化试验得出的结果,分析了粉土液化的机理、影响因素以及在振动过程中粉土中孔隙水压力的增长规律,认为粉土中的粘粒含量、密实度以及土的结构性对其抗液化能力有较大的影响。考虑到试验中振动次数的离散性,引入了时间参数的概念,根据动三轴试验结果提出了孔隙水压力增长的经验公式,可以比较方便地应用于计算液化的有限元程序中去。
Soil liquefaction is a major cause of site damage during earthquakes. Since Casagrande＇s works, significant progress has occurred. But, most of these are applicable for sandy soils. So, based on the former research and the dynamic triaxial test, some questions are analyzed, including the mechanism of silty soil liquefaction and some factors, such as the clay particle content, the relative density and the structure of the soil, which impact on the liquefaction strength of the silty soils. The pore water pressure is also, studied. Considering that the number of cyclic loading is non-continuous, a new applied model is proposed to evaluate the pore water pressure, which is expediently applied into the finite element method programs. Key words： silty soil; liquefaction; pore water pressure; pore water pressure model
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2005年第10期1663-1666,共4页
Rock and Soil Mechanics
基金
铁道部发展基金资助项目(No.2002G002(B))
国家杰出青年科学基金资助项目(No.50325826)。
关键词
粉土
液化
孔隙水压力
孔压模型
silty soil
liquefaction
pore water pressure
pore water pressure model
