红砂岩地区基桩完整性检测中低应变法的效能分析与实践研究
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中图分类号：U443.15 文献标志码：A 文章编号：1003-5168（2025）16-0078-05
DOI：10.19968/j.cnki.hnkj.1003-5168.2025.16.016
Efficiency and Practice ofLow-Strain Pile Integrity Testing in Red Sandstone Areas
ZHANG Wenming' XIAO Fei²DU Hongyuan³ WANG Jun²
（1.Quzhou Manufacturing New City Panlong Enterprise Community Service Center， Quzhou 3240oo， China;
2. Zhejiang CITIC Testing Co.，Ltd.，Quzhou 3240oo， China; 3.Longyou County Urban Development Investment Co.，Ltd.， Longyou 324400， China）
Abstract：[Purposes] Pile foundations are critical components ofbridgesand buildings，whosesafety and stability directly affect structural integrity.The complex geological conditions of red sandstone areas， which are prone to disintegration， may compromise pile foundation stability.To ensure construction quality，integrity testing of pile foundations in red sandstone areas must be conducted promptly.[Methods] This study employs the low strain method for pile integrity detection in red sandstone areas.Based on one-dimensional wave theory，the method utilizes excitation devices and sensors to detect stress waves generatedbypile-top excitation，with reflected signals indicating pileconditions.[Findings]A detection system was developed following the low strain method's principles and applied to a pile foundation projectin Quzhou.Processed data successfully identified defective piles，demonstrating the system's efficacy.[Conclusions] The case study in Quzhou's red sandstone area validates the low strain method’s effectivenessin detecting common pile defects such as fractures，necking，bulging，mud inclusion，excessive sedimentthickness，weak pile toes，insufficientstrength，and segregation.However，limitations eist： constrained by pile length/diameter，defect characteristics，material properties，and geological conditions，the method cannot evaluate pile strength or bearing capacity. Thus，complementary testing methods should be integrated for comprehensive quality assessment to ensure engineering safety.
Keywords： low strain method; pile integrity;red sandstone
0 引言
近年来，我国铁路、桥梁及建筑等各类工程建设规模逐渐扩大，灌注桩的应用范围也日益拓宽。（剩余6564字）
