昆明滇池特殊土质下高频振动沉桩对周边土体的影响  

Influence of high-frequency vibration sinking piles on surrounding soils in Kunming Dianchi lake special soil

作　　者：刘思楠 谢建斌 张文豪 高阳 时林丰 宋桂丽 LIU Sinan;XIE Jianbin;ZHANG Wenhao;Gao Yang;SHI Linfeng;SONG Guili(School of Architecture and Planning,Yunnan University,Kunming 650500,Yunnan,China;Kunming Junlong Geotechnical Engineering Co.,Ltd.,Kunming 650021,Yunnan,China;Yunnan Hualing Bulding Design Co.,Ltcd,Kunming 650216,Yunnan,China)

机构地区：[1]云南大学建筑与规划学院,云南昆明650500 [2]昆明军龙岩土工程有限公司,云南昆明650021 [3]云南华凌建筑设计有限公司,云南昆明650216

出　　处：《河南理工大学学报（自然科学版）》2021年第2期166-172,共7页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(11862024,51264037);云南省教育厅科学基金资助项目(2019Y0020)。

摘　　要：为研究高频振动沉桩水平动力响应规律,依托昆明滇池国际会展中心4号地块深基坑钢管支护桩振动沉桩工程实例,通过现场勘测、室内土工试验,基于Midas GTS NX有限元软件建立相应的三维动力沉桩模型,通过对比分析周边土体纵横空间不同点位水平动力响应,对高频振动桩在10 s激振力作用下其周边土地位移场、速度场和加速度场的影响进行研究。结果表明:随着沉桩时间推移,钢管桩管壁处周围土体的水平位移和水平加速度逐渐增大,向钢管桩内侧移动的速度逐渐减小,而向钢管桩外侧移动的速度逐渐增大;随着管壁处土体深度增大,管壁处土体的水平位移和水平加速度先增大后减小,深度较浅时,土体的水平速度为正值,达到一定深度时,土体的水平速度变为负值。In order to study the horizontal dynamic,relying on Kunming Dianchi Lake International Convention and Exhibition Center,No.4 block deep foundation pit steel tube supporting pile vibration sinking pile engineering example,through site survey and indoor geotechnical test,was established a corresponding 3 D dynamic pile sinking model.Through comparative analysis,the horizontal dynamic response at different points in the vertical and horizontal space of the surrounding soil was used to study the effects of the displacement field,velocity field,and acceleration field of the surrounding soil under the 10 s excitation force of the high-frequency vibrating pile.Research results showed thatas the pile sark with time,the horizontal displacement and horizontal acceleration of the soil surrounding the steel pipe pile wall gradually increased,the speed of moving toward the inside of the steel pipe pile gradually decreasesd,and the speed of moving toward the outside of the steel pipe pile gradually increasesd.As the depth of the soil at the pipe wall increasesd,the horizontal displacement and horizontal acceleration of the soil at the pipe wall increased first and then decreased.When the depth was shallow,the horizontal velocity of the soil was positive,when reaching a certain depth,the horizontal velocity of the soil was negative.

关 键 词：钢管桩 高频振动 振动沉桩 挤土效应 数值模拟 

分 类 号：TU472[建筑科学—结构工程]