基于物联网技术的PHC管桩加固湿软黄土地基自动化监测现场试验

FIELD TEST OF AUTOMATIC MONITORING OF PHC PILES FOR REINFORCEMENT OF WET AND SOFT LOESS FOUNDATION BASED ON INTERNET OF THINGS TECHNOLOGY

预应力高强度混凝土(Pre-stressed High-strength Concrete:PHC)管桩作为一种常用的处理湿软黄土地基方法,质量稳定可靠。但是,在传统PHC管桩施工过程中,对管桩贯入位移的记录存在频率不足、效率不高等问题,未能满足预期的地基处理施工监测效果。鉴于此,基于物联网的基本框架和技术,依托甘肃安临高速PHC管桩处理湿软黄土地基工程,设计了一套PHC管桩施工质量自动化监测系统,采用自行研发的监测装置与系统,针对管桩在施工过程中的贯入位移质量控制指标进行了现场监测试验。结果表明:该监测系统可实时输出管桩贯入土层过程中贯入位移随锤击次数的响应情况,并将管桩贯入持力层的信息及时反馈于现场施工作业区。同时借助地质雷达与低应变检测技术验证了该监测系统的可靠性。该研究成果可为PHC管桩在施工过程中实现贯入信息采集的智能化提供一定的技术支撑。

Pre-stressed High-strength Concrete(PHC)piles,as a common method for treating wet and soft loess foundations,have stable and reliable quality.However,in the traditional PHC pipe pile construction process,the recording of the pipe pile penetration displacement has problems such as insufficient frequency and low efficiency,which fail to meet the expected monitoring effect of foundation treatment construction.In view of this,based on the basic framework and technology of the Internet of Things,relying on Gansu Anlin Expressway PHC piles to treat wet and soft loess foundations,a set of PHC pile construction quality automatic monitoring systems are designed,and self-developed monitoring devices are used for piles.During the construction process,the quality control index of the penetration displacement was monitored and tested on-site.The results show that the monitoring system can output the response of the penetration displacement of the piles into the soil layer with the number of hammer strokes in real time and feed back the information of the piles penetrating the bearing layer to the on-site construction work area in time.At the same time,the reliability of the monitoring system was verified with the help of geological radar and low-strain detection technology.The research results can provide certain technical support for the intelligent collection of penetration information of PHC piles during the construction process.