夯实水泥土桩复合地基动力特性和时程响应影响因素分析  

EFFECTS ON DYNAMIC CHARACTERISTICS AND RESPONSE OF RAMMED SOIL-CEMENT PILE COMPOSITE FOUNDATION

作　　者：王维玉 赵拓 丁继辉[2] 

机构地区：[1]河北省建筑科学研究院,河北石家庄050021 [2]河北大学建筑工程学院,河北保定071002

出　　处：《工程力学》2011年第A02期187-191,共5页Engineering Mechanics

基　　金：河北省科技厅项目(072156106);河北省住房和城乡建设厅项目(2007-135)

摘　　要：采用爆破地震动模拟天然地震动的方式对足比尺夯实水泥土桩复合地基进行现场动力试验研究。在空载时对天然地基和夯实水泥土桩复合地基的动力特性和时程响应进行了分析;对单桩和群桩复合地基分别在脉动和爆破作用下的动力特性和时程响应进行了分析。研究了爆破作用下,单桩和群桩复合地基峰值加速度、最大水平位移的变化规律;夯实水泥土桩在不同荷载条件下主频的变化规律;为探讨动力荷载作用下水泥土桩复合地基的承载和变形特性提供了研究基础。Dynamic property experiments of full scale rammed soil-cement pile composite foundation are conducted by means of simulating natural earthquake through blast earthquake. With no load applied, the dynamic characteristics and time-history responses of natural foundation and rammed soil-cement pile composite foundation are analyzed firstly. Then the dynamic characteristics and time-history responses of single pile and group-piles rammed soil-cement pile composite foundation are analyzed under static load and explosions respectively. The horizontal displacement and the peak acceleration of single-pile and group-piles composite foundation under blast earthquake action are studied, as well as the variation frequencies under different load conditions. This research provides references for the later study of bearing capacity and deformation characteristics of rammed soil-cement pile under dynamic load.

关 键 词：夯实水泥土桩 主频 峰值加速度 最大水平位移 爆破地震作用 

分 类 号：TU447[建筑科学—岩土工程]