砂桩加固可液化地基的振动台试验研究  

Test study on the shake table of the sand-and-pile reinforced and liquified ground

作　　者：李立军[1] 牛琪瑛[1] 梁仁旺[1] 杨庆陶[1] 

机构地区：[1]太原理工大学建工学院土木系,山西太原030024

出　　处：《西安建筑科技大学学报（自然科学版）》2010年第4期557-560,共4页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50578104);山西省自然科学基金资助项目(2006011046)

摘　　要：饱和砂土地震液化问题是岩土地震工程中一个重要的研究课题,利用振动台在室内开展相关研究是一种行之有效的方法.利用小型振动台模型试验研究散体材料加固可液化地基,得出不同桩距下孔隙水压力的变化规律,探讨不同桩距对抗液化效果的评价.试验表明,桩距在3～3.5桩径时,孔隙水压力最小,抗液化效果最佳;而且得出浅层土比深层土更易液化的结论.建议在实际设计中桩距取3～3.5桩径,并且长短桩结合使用,既能取得良好的加固效果又能降低工程造价.Liquefaction of saturated sands remains an important topic in geotechnical earthquake engineering.Anindoor Shaking table model experiment is an effective method for studging liquefaction of saturated sands.With such a smale vibration table in the test for studying the liquified ground which is rein-forced with loose materid like the sand pile,the variation regularities of pore-water pressure at diffcrent pile distance as well as the assessment on the effectiveness of liquifaction resistance of pile distance can be arrived at.The experiment also indicated that the pressure of pore-water remains the lowest and liquifaction resistance the best at a pile distance spacing of 3～3.5 pile diameters.As a resuer,the soil at the shallow depth is more easily liquified that at a deeper depth.The paper further proposed that the 3～3.5 pile diameter spacing be adopted for the pile distace.Moreover,both short and long pile showed be used in combiuation so as not only to produce better reinforcing effect but also to reduce the cost of the project.

关 键 词：砂桩 砂土液化 振动台试验 超静孔隙水压力 桩距 

分 类 号：TU472.32[建筑科学—结构工程]