基于密度控制理论的饱和黄土地基抗液化处理指标研究  

Indices of anti-liquefaction treatment of saturated compacted loess foundation based on theory of density control

作　　者：王谦[1,2] 王兰民[1,2] 王峻[1,2] 高中南 

机构地区：[1]中国地震局黄土地震工程重点实验室,甘肃兰州730000 [2]中国地震局兰州地震研究所,甘肃兰州730000

出　　处：《岩土工程学报》2013年第S2期844-847,共4页Chinese Journal of Geotechnical Engineering

基　　金：中国地震局黄土地震工程重点实验室开放基金项目(KLLEE-12-003);国家自然科学基金项目(50978239)

摘　　要：选择兰州市典型场地挖取Q3黄土,制备不同干密度的击实黄土试样,在WF-12440型动三轴–扭剪试验系统上进行了动三轴液化试验。通过整理和分析试验结果,得出了干密度与液化应力比之间的定量影响关系,分析了不同干密度的饱和击实黄土的动残余变形发展特征,并根据Seed简化判别法计算了不同地震烈度下饱和黄土液化的临界液化应力比,从而得出了不同抗震设防烈度下饱和黄土地基抗液化处理的干密度阈值,为工程中地基抗液化密实处理提供了理论依据。Several compacted loess samples with different dry densities are prepared, which are the typical loess in Lanzhou City. The dynamic triaxial liquefaction tests are conducted by using the WF-12440 hollow cyclic apparatus. Through analysis of the experimental data, the relationship between liquefaction stress ratio and vibration times of the saturated compacted loess with different dry densities is proposed, the quantitative relationship of influence on liquefaction stress of saturated compacted loess by the initial void ratio is established, and the dynamic strain characteristics of saturated compacted loess with different dry densities are analyzed. Moreover, the critical liquefaction stress ratio and the critical dry density under different seismic intensities are calculated according to the Seed simplified procedure for liquefaction evaluation. The results are excepted to provide guidance for the anti-liquefaction treatment of the site in real projects.

关 键 词：黄土液化 干密度 地基处理 指标 

分 类 号：TU444[建筑科学—岩土工程]