振冲碎石桩复合地基动力参数试验研究

Experimental Study of Composite Foundation's Dynamic Parameters of Vibroflotation Gravel Pile

通过块体基础激振测试的方法介绍和成果分析,讨论了影响测试结果的一些因素,提出了振冲碎石桩复合地基各振型刚度系数之间的关系;利用现场实测波速数据,根据弹性半空间计算模式实用化方法得到地基刚度系数计算值,发现竖向抗压刚度系数的实测值与计算值较为吻合,计算方法值得推广;明确了阻尼比的规范经验确定方法简单可行;论文得到的地基动力参数的实测数据和综合确定方法,可供规范修订和工程设计参考。

Through introducing the method of a vibroflotation gravel pile and analyzing testing results, some influence factors on testing are discussed, the correlation between coefficients of s e different directions reaction about vibroflotation gravel column are also put forward. By utilizing data of wave velocity measurement according to elastic half-space mode, coefficients of culated and tested values of vertical coefficient of subgrade reaction are calculated. It is concluded that both calsubgrade reaction are close and that this method is applicable. It also clarifies that damping ratios obtained by empiric method from Code are simple and available. The experimental data and method of determining dynamic parameters for composite subsoil provide reference to code revision and project design.