摘要
不同抗震设计规范的砂土液化判别方法或国内外其他有代表性的液化判别方法所采用的地震动参数和土性指标及其埋藏条件是不同的,因而采用这些方法对同一工程场地进行液化势预测时其评价结果通常有一些差异,甚至会得到相反的结论。为了给重大工程建设提供较为合理、可信的地基液化势预测结果,采用多种液化判别方法进行场地液化势的综合评价是比较客观的,也是必要的。本文结合某长江大桥桥基工程,采用建筑抗震设计规范的砂土液化判别方法、国内外有代表性的液化判别方法、有限元数值分析法等多种方法逐一对该工程场地砂性土层进行液化判别,并结合室内动三轴液化试验结果,对主桥墩不考虑冲刷条件和考虑一般冲刷深度5m条件时的砂性土层进行了液化势的综合评价,并将各土层的液化势分为液化、可能液化和不液化3个等级,得到了较为合理可靠的判别结果。
The different parameters are adopted, such as earthquake ground motion parameters, soil behaviour indexes and geological burying conditions, in the estimating methods for liquefaction potential of sandy soil in different seismic design codes and some typical estimating methods at home and abroad. So, there are some differences in evaluation results of sand liquefaction potential, when different estimating methods of liquefaction potential for sandy soils are applied in the identical engineering site. It is objective and necessary for multi-methodology in liquefaction estimation of sandy soil employed to give the appropriate and creditable comprehensive evaluation results of lique- faction potential for important engineering projects. In this paper, the estimating methods for liquefaction potential of sandy soils of code for seismic design of buildings in China, the typical estimating methods at home and abroad and the finite-element analysis method are employed in evaluating the liquefaction potential for sandy soils at a site of one highway bridge on Yangtze river under ground surface 15 m to 30 m, in combination with the vibration triaxial test results. The appropriate and creditable comprehensive evaluation results of sandy soils liquefaction potential are given based on the methods mentioned above, through considering 5m depth and without regard to riverbedscour condition. Moreover, the evaluation standard of liquefied potential for sandy soils is provided including liquefaction, probably liquefied and non-liquefied.
出处
《地震工程与工程振动》
CSCD
北大核心
2007年第5期151-159,共9页
Earthquake Engineering and Engineering Dynamics
关键词
重大工程场地
液化判别方法
深层砂土液化
液化势综合评价
important engineering project site
method for sand liquefaction estimating
liquefaction of deep-level sandy sandy soil
Comprehensive evaluation of sandy soil liquefaction potential
