动载试验及分析在美国打入桩设计和施工中的作用.pdf

动载试验及分析在美国打入桩设计和施工中的作用 1 2 2 梁力群 ，李侠 ，徐晓林 (1．Pile Dynamics, Inc., 30725 Aurora Road, Cleveland, OH 44139,USA. 2。欧美大地仪器设备中国有限公司, 广州市广仁路 1 号广仁大厦 16 楼., 510030, 中国) 摘要：由于打入桩具有一定的优势、如快速、灵活、易保证质量等，在美国的深基础中应用很广泛。动载试验及分析包括 高应变动测、信号拟合和波动方程分析，可用来确定打桩应力、土阻力的恢复或松弛、及承载力的分布。很多规范规定如 采用静载试验、动载试验和分析或其组合可提高荷载和抗力系数设计（LRFD）方法中的土抗力系数。因而动载试验及分析 在美国打入桩的设计和施工中得到大量应用，为优化设计，监控施工质量起到很大作用。在介绍美国打入桩设计和施工的 现状、使用的规范及高应变动载试验和分析的新发展的同时，通过探讨该方法的实际使用，来理解该方法如何减少打入桩 深基础的成本、提高质量,从而提高所支持结构的安全性。 关键词：高应变动载试验；信号拟合；波动方程分析；深基础；承载力；CAPWAP® 中图分类号：TU 443 文献标识码：A The Role of Dynamic Testing and Analysis in Current Practice of Design and Construction of Driven Pile Foundation in USA 1 2 2 Liqun Liang , Xia Li , Xiaolin Xu (1.Pile Dynamics, Inc., 30725 Aurora Road, Cleveland, OH 44139,USA. 2. Earth Products China Limited, 16/F, Guangren Building, No.1, Guangren Rd., Guangzhou 510030, China) Abstract : Due to their advantages such as fast installation, flexibility, easy to control quality, etc., driven piles have been widely used as deep foundation in USA. High Strain Dynamic Load Testing and wave equation analysis can be used to determine the stresses in the pile during driving, the setup or relaxation of soil resistance and the distribution of soil resistance. If static load test, dynamic load test and wave equation analysis or the combination is used to determine the capacity, many codes and specifications allow application of higher resistance factor of LRFD. Therefore, dynamic load test and wave equation analysis are widely applied to the design and construction of driven pile foundation in USA and has been playing important role in the design optimization and quality cont