1前言桩基础是现代建筑工程地基加固的一种常用方法，而桩基施工质量的好坏决定整个工程的质量。桩基础质量检测一般是用小应变法来检测。而在一些长极（一般在40m以上）的检测中，小应变法由于冲击能量损耗、扩散及仪器设备灵敏度等方面的原因，往往测试效果不理想。所以在一 1 Introduction Pile foundations are a common method of foundation reinforcement in modern construction projects, and the quality of the pile foundation determines the quality of the entire project. Pile foundation quality inspection is generally measured by small strain method. However, in some long-polarity tests (typically more than 40m), the small strain method often results in unsatisfactory test results due to impact energy loss, diffusion, and instrumentation sensitivity. So in one