基于低應(yīng)變檢測法的缺陷樁基動力響應(yīng)研究

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中圖分類號：TQ178;TP391.9 文獻(xiàn)標(biāo)志碼：A文章編號：1001-5922（2025）07-0064-04

Abstract：Relying on a reconstruction project in Chengde High-tech Zone，the dynamic response of the defective pile foundation（necking）underlow straindynamic load was studied byusing the methodofcombining field measurementand three-dimensional dynamic finite element numerical simulation，and the results showed thatthedynamicresponseof themissng pile foundation（necking）changed significantlyunder theactionof the low-strain dynamic detection wave，and the amplitude of the reflected wave increased by about 25% for every O.4 m increase in the necking thickness，and there was no significant change in the reflected wave atthe botom of the pile.For every 0. 2m increase in pile diameter in the necking area，the amplitude of the reflected wave in the necking area increased by about 10% . The amplitude of the reflected wave at the bottom of the pile increased by about 8% .For every2 m increase in the distance between the necking areaand the topof the pile，the amplitude ofthe reflected wave increased byabout 13% ，and there was no significant change in the reflected wave at the bottom of the pile.When detecting pile foundation defects with low strain dynamics，underthecondition of ensuring thattheexcitation force and action area remain unchanged，attention should bepaid toobservingthe changes inthe necking area and theamplitude of the emission wave at the botom of the pile，so as to beter determine the defects ofthe pile foundation and provide guarantee for the safety and stability of the superstructure structure.

Key words ：low strain； pile foundation defect；on-site measurement；digital simulation； power response

當(dāng)前，國內(nèi)外眾多學(xué)者開展了許多關(guān)于樁基缺陷檢測的研究，例如，張?jiān)迄i修正了Rayleigh-Love桿件理論，采用理論推導(dǎo)的方法得出了低應(yīng)變動力測樁的三維傳播解析解，認(rèn)為信號疊加法可以很好的消除高頻橫波的干擾[1]。（剩余4200字）