上海交通大学学报(自然版) ›› 2013, Vol. 47 ›› Issue (10): 1562-1568.

• 建筑科学 • 上一篇    下一篇

缺陷桩的旁孔透射波法检测分析原理

杜烨1,2,陈龙珠1,张敬一1,杨宇3,马晔3
  


  1. (1.上海交通大学 安全与防灾工程研究所, 上海 200240; 2.山东科技大学 资源与环境工程学院, 山东 青岛 266590; 3.交通运输部公路科学研究院, 北京 100088)
     
  • 收稿日期:2012-10-24 出版日期:2013-10-30 发布日期:2013-10-30
  • 基金资助:

    国家自然科学基金项目(51178267),交通运输部西部交通科技项目(201131822313

Analysis of Defects of Pile Shaft for Parallel Seismic Test

DU Ye1,2,CHEN Longzhu1,ZHANG Jingyi1,YANG Yu3,MA Ye3
  

  1. (1.Institute of Engineering Safety and Disaster Prevention, Shanghai Jiaotong University, Shanghai 200240, China; 2.College of Resources and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China; 3.Research Institute of Highway, Ministry of Transport, Beijing 100088, China)
  • Received:2012-10-24 Online:2013-10-30 Published:2013-10-30

摘要:

以均质弹性地基中具有低速缺陷段的基桩为研究对象,利用基于Snell定律的射线理论,对旁孔中首至透射P波的时深关系推导了一套简化理论计算公式,并由此提出了采用旁孔透射波法检测分析桩身缺陷的方法.对饱和地基中具有低速缺陷段的基桩,采用轴对称有限元法模拟计算了旁孔透射波法测试信号,对其按上述方法分析推算桩身低速缺陷段的位置、长度和波速以及桩长,以检验本文方法的可靠性.结果表明,本文方法具有良好的实用潜力,值得开展进一步的验证和试用工作.

 
 

关键词: 旁孔透射波法, 桩身缺陷, 简化计算模型

Abstract:

Based on Snell’s law for simplified pile-soil models, a series of formulae of time-versus-depth relations of the first-arrival of P wave in the parallel seismic test (PST) were derived and a reasonable method for determination of pile defects was proposed in this paper. An axisymmetric finite element model of a single defected pile in saturated soil was used to simulate the PST. The location, length and Pwave velocity of the defect in the pile shaft as well as the pile length were analyzed with the method presented. The results proved the application potential of the method proposed this paper, which is worth of further verification by field tests.
 

Key words:  parallel seismic test, pile defects, simplified model

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