摘要
砂土液化问题和处理一直是土动力学与岩土地震工程研究领域的重要课题之一。基于南水北调中线某工程液化砂土处理为例,应用正交设计方法,以桩径、桩长和桩间距3个参数作为正交试验的3个因素,每个因素取3个水平,设计了9组加固处理方案,进行了夯扩挤密碎石桩处理砂土液化动力数值分析,获得了不同加固方案下的饱和砂土中超静孔隙水压力和孔压比。采用极差分析法分析了桩径、桩长和桩间距对超静孔隙水压力和孔压比的影响规律,并做出了各因素对砂土超静孔隙水压力和孔压比影响的直观分析图,得到了夯扩挤密碎石桩的最优加固方案。
The sand liquefaction problem has been one of the important topics in soil dynamics and geotechnical earthquake engineering. Combined with a liquefied sand ground treatment project of the Middle Route Project of South-to-North Water Diversion, according to the orthogonal design method, 9 reinforcement treatment programs are designed, which take three parameters of pile diameter, pile length and pile spacing as the three factors of the orthogonal tests, and each factor takes 3 levels further. Dynamic numerical analysis is conducted on the liquefied sand ground treatment with compacted gravel piles. And the excess pore water pressure and pore pressure ratio in the saturated sand foundation are obtained under different reinforcement programs. How the pile diameter, pile length and pile spacing affect the excess pore pressures and the excess pore pressure ratio is analyzed by means of the range method. The intuitive analysis charts of how various factors affect the excess pore pressures and excess pore pressure ratio are drawn. Finally, the optimal reinforcement with compacted gravel piles can be obtained.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2013年第S2期968-973,共6页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金资助项目(41140030)
国家自然科学基金青年基金资助项目(41102203)
河南省基础与前沿技术研究项目(122300410146)
华北水利水电学院高层次人才引进项目(201105)
关键词
正交设计方法
动力数值分析
砂土液化
超静孔隙水压力
孔压比
直观分析图
orthogonal design method
dynamic numerical analysis
liquefiable sand soil
excess pore water pressure
pore pressure ratio
direct analysis chart
