摘要
以厦门市湖里区某污水处理厂地下工程为依托,运用Midas GTS数值软件,对围护桩的低应变检测反应机理进行数值模拟研究,分析锤击力大小、脉冲宽度、信号接收位置、弹性模量、泊松比等因素对低应变检测结果的影响。结果表明:锤击力大小不影响速度-时程曲线变化规律,但影响波的强度;脉冲宽度越大入射波接收时间延迟越严重,入射波与反射波幅值都有一定程度的增大;在距离桩中心2/3R位置,信号接收能量损失最小,反射波最明显;弹性模量增大,入射波幅值、反射波幅值均减小;泊松比对低应变反射波接收信号几乎没有影响。
In order to study the effects of hammering force,pulse width,signal receiving position,elastic modulus and Poisson's ratio on low strain detection results,this paper based on the underground project of a sewage treatment plant in Huli District,Xiamen,the low strain detection reaction mechanism of retaining pile is numerically simulated by using Midas GTS numerical software,and the effects of hammering force,pulse width,signal receiving position,elastic modulus and Poisson's ratio on the low strain detection results are analyzed.The results show that the hammering force does not affect the variation law of velocity time history curve,but affects the strength of wave;The larger the pulse width,the more serious the receiving time delay of incident wave,and the amplitude of incident wave and reflected wave increase to a certain extent;At the position 2/3R from the pile center,the signal receiving energy loss is the smallest and the reflected wave is the most obvious;With the increase of elastic modulus,the incident wave amplitude and reflected wave amplitude decrease;Poisson's ratio has little effect on the received signal of low strain reflected wave.
作者
苏志超
SU Zhichao(China Building Material Test&Certification Group Xiamen Hongye Co.,Ltd,Xiamen 361015)
出处
《福建建筑》
2022年第3期73-78,共6页
Fujian Architecture & Construction
