摘要
对动冰载作用下饱和砂土层液化过程中桶形基础承载力的弱化规律进行了数值模拟。建立液化土层的简化计算模型,采用FLAC3D软件分析了等效动冰载作用下土层不同位置的液化度及其主要影响因素;进而将具一定液化度土层的抗力作用等效为沿桶壁的不同刚度的非线性弹簧作用,在给定的位移破坏标准下确定不同液化度土层中桶形基础的承载力,分析液化土层中桶形基础承载力的弱化特征。在文中荷载条件和计算模型下,当土层顶面液化度为0.60、底面液化度为0.06时,土层中桶形基础的承载力降低12%。
The capacity degradation of bucket foundation during the liquefaction of sand deposit is simulated under dynamic ice-induced loads.The simplified numerical model has been built and thesoftware FLAC3D has been used to analyze the liquefaction degree in different position of the deposit and its main impact under equivalent dynamic ice-induced loads.The resistance of liquefied sand layer is modeled by uncoupled non-linear springs,so as to determine the bearing capacity of bucket foundation in sand layer with different liquefaction degree for some given failure criterions and analyze the capacity degradation of bucket foundations in liquefied sand deposit.For an example,it is shown that when the liquefaction degree is 0.6 on the top of sand deposit and 0.06 at the bottom of sand deposit,the bearing capacity of bucket foundation degrades 12%.
出处
《中国海上油气》
CAS
北大核心
2010年第1期65-68,72,共5页
China Offshore Oil and Gas
基金
中国科学院
中国海洋石油总公司联合重大项目"海洋石油开发若干重大科学技术问题研究"(KJCX2-SW-L03-01)资助的部分研究成果
关键词
液化土层
桶形基础
等效动冰载
液化度
弱化规律
数值模拟
liquefied sand deposit
bucket foundation
equivalent dynamic ice-induced loads
liquefaction degree
degradation law
numerical simulation
