基于应变测量的桩基础轴力和横向变形同步监测方法  

The Synchronous Monitoring Method of Axial Pressure and Horizontal Displacement of Pile Foundation

作　　者：乔升访 曾繁良 陈航 侯景强 QIAO Sheng-fang;ZENG Fan-liang;CHEN Hang;HOU Jing-qiang(Guangzhou Institute of Building Science Group Co.,Ltd1,Guangzhou 510440;Guangzhou Construction Engineering Co.,Ltd,Guangzhou 510000;China Construction Second Engineering Bureau Co.,Ltd,Beijing 100160)

机构地区：[1]广州市建筑科学研究院集团有限公司,广州510440 [2]广州建筑股份有限公司,广州510000 [3]中国建筑第二工程局有限公司,北京100160

出　　处：《广州建筑》2024年第4期43-47,共5页GUANGZHOU ARCHITECTURE

基　　金：广州市建筑集团有限公司科技计划项目(2022–KJ003、2022–KJ030);广州市白云区创新创业领军团队项目(2021-0305)。

摘　　要：深厚软土层地区超长桩基础的轴向受力、水平变形对工程结构正常使用与安全性起着重要影响,而实现二者同步监测尚无可用方法。本文提出基于应变测量的桩基础轴向压力和水平位移同步监测方法,以应变片感知应变变化来反映桩基础轴向压力和水平位移情况,通过振弦式钢筋计进行验证。依托某立交桥工程,建立深厚软土层超长桩基础无线智能监测系统,采用无线智能采集仪采集传感器数据,借助于Lora模块形成局域网并汇总各传感器的监测数据,再通过4G模块将汇总数据上传至云平台。通过无线监测数据与传统采集器数据进行对比,发现二者数据误差在微小(0.3 Hz)以内,表明无线智能监测系统可靠性好、精度高;传统振弦式钢筋计所测应变与智能测斜管的误差在-11.32%~6.03%之间,表明智能测斜管具有较高的准确度和稳定性,采用智能测斜管进行桩基础受力性能监测是可行的。研究可为桩基础轴向压力和水平位移监测提供新的思路。The axial force and horizontal deformation of super-long pile foundation were vital to service and safety of construction projects in deep soft soil layer,however,the synchronous monitoring of axial force and horizontal deformation was not available.In this paper,a synchronous monitoring method of axial pressure and horizontal displacement of pile foundation was proposed based on strain measurement.The Strain gauge was used to reflect the axial pressure and horizontal displacement,which was verified by vibrating wire reinforcement meter.The wireless intelligent monitoring system was established for super-long pile foundation in deep soft soil in the overpass project.The sensor data was acquired using wireless intelligent acquisition instrument.The local area network was formed by Lora modules,thus the monitoring data of each sensor was collected.Furthermore,the collected data was uploaded to the cloud platform using 4G wireless communication technology.By comparing the intelligent monitoring data with the traditional collector data,it was found that the error was negligible(within 0.3Hz),which indicated that the accuracy and stability of wireless intelligent monitoring system was reliable.The error between the strain measured by the traditional vibrating wire reinforcement meter and the intelligent inclinometer was-11.32%~6.03%,which indicated that the intelligent inclinometer has high accuracy and stability.It is feasible to use the intelligent inclinometer to monitor the mechanical performance of Pile foundation.The research could provide a new method for monitoring the axial pressure and horizontal displacementof Pile foundation.

关 键 词：深厚软土层 超长桩基础 智能测斜管 无线智能监测系统 云平台 

分 类 号：TU198[建筑科学—建筑理论]