考虑谐振信号干扰的陡坡段基桩低应变检测优化方法  

Optimization method for low strain detection of steep slope foundation piles considering resonance signal interference

作　　者：李胜 LI Sheng(Shandong Zhengyuan Engineering Testing Co.,Ltd.,Jinan 250101,China)

机构地区：[1]山东正元工程检测有限公司,济南250101

出　　处：《无损检测》2024年第8期13-17,共5页Nondestructive Testing

摘　　要：单一分析应力波信号相位参数时,应变波分析过程中忽略了谐振信号的干扰,而导致陡坡段基桩低应变检测结果准确度较低,因此,提出一种考虑谐振信号干扰的陡坡段基桩低应变检测优化方法。基于陡坡段基桩的土体建设方法,获取其应力波信号,通过求解谐振信号的概率密度函数,结合最大化似然函数修正谐振信号的干扰,优化应力波信号,解析应力波在基桩中的行波过程,分析低应变检测结果。试验结果表明,所提方法得出的陡坡段基桩检测结果表现出的荷载一致度较高,结果准确度较高,能够满足陡坡段基桩安全检测工作的实际需求。When analyzing the phase parameters of stress wave signals alone,the strain wave analysis process ignores the interference of resonance signals,resulting in low accuracy of low strain detection results for steep slope section piles.Therefore,an optimization method for low strain detection of steep slope section piles considering the interference of resonance signals is proposed.Based on the soil construction method of steep slope foundation piles,the stress wave signal is obtained.By solving the probability density function of the resonance signal and combining it with the maximum likelihood function to correct the interference of the resonance signal,the stress wave signal is optimized,the traveling wave process of the stress wave in the foundation pile is analyzed,and the low strain detection results are analyzed.The experimental results show that the load consistency of the pile detection results obtained after the application of the proposed method is high,indicating that the accuracy of the results is high and meets the practical needs of pile safety detection in steep slope sections.

关 键 词：陡坡段基桩 基桩应变 低应变 谐振信号 应变检测 信号干扰 

分 类 号：TU473[建筑科学—结构工程] TG115.28[建筑科学—土工工程]