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PDA高应变动力测桩技术是目前国际上公认的一种先进测桩技术,它包括CASE法、CAPWAPC法,已列入美国、加拿大、英国、澳大利亚、荷兰、德国等国家的规范或规程。我国于1986年引进第一台PDA仪器至今,已发展到十几台并得到了广泛应用。国家建筑工程质量监督检验测试中心亦于1989年主编、发行了《高应变动力试桩法暂行规定》。 PDA高应变动力测桩技术主要有下列功能: 1.确定桩的承载能力; 2.检验桩身的结构完整性; 3.打桩时监测桩身应力,选择桩合理长度和收锤贯入度标准; 4.测定打桩锤的效率; 5.当采用CAPWAPC程序分析时,可得到桩侧与桩尖土阻力分布,模拟静载荷试验的P～S曲线等。
The PDA high-strain dynamic pile test technology is an internationally recognized advanced pile testing technology. It includes the CASE method and the CAPWAPC method and has been listed in the specifications or regulations of the United States, Canada, the United Kingdom, Australia, the Netherlands, and Germany. China’s introduction of the first PDA instrument in 1986 has grown to over a dozen and has been widely used. The State Construction Engineering Quality Supervision, Inspection and Test Center also edited and issued the “Provisional Regulations on the Test Method for High Strain Dynamic Testing Piles” in 1989. The PDA high-strain dynamic pile test technology mainly has the following functions: 1. Determine the bearing capacity of the pile; 2. Check the structural integrity of the pile; 3. Monitoring the pile stress when piling, select the reasonable length of the pile and the standard of hammer penetration 4. Determining the efficiency of the pile hammer; 5. When using the CAPWAPC program analysis, the distribution of pile-side and pile-tip soil resistance can be obtained, and the P-S curve of the simulated static load test can be obtained.