Detection of Underground Obstacles by the SASW Test

9622140拟议的研究计划的目的是开发实用程序，在现场的频谱分析表面波（SASW）技术检测地下障碍物。 这样的发展是重要的，主要有两个原因：1）在地下道路通行权拥挤的城市地区，检测地下障碍物或空隙的位置和特性的能力对于维护、修理和修复是重要的。 2)这项研究将提供指导方针，最大限度地减少地下障碍物的影响SASW网站特性。 现有的实验和数值研究表明，地下障碍物和土壤的非均匀性有显着的影响瑞利波频散SASW测试评估。 这项研究将包括一个完善的障碍物检测的数值模型，验证开发的程序在土壤系统和路面下的障碍物检测，并集成到软件包的自动SASW测试的程序。 改进涉及优化的程序方面的数量，间距和放置的接收器，和更准确的评估的一些障碍物参数。 将在实验室和实地对程序进行核查和执行。 将与新泽西交通部合作选择和准备试验地点。 ***

9622140 The objective of the proposed research program is to develop practical procedures for detection of underground obstacles in the field by the Spectral-Analysis-of-Surface-Waves (SASW) technique. Such a development is important for two major reasons: 1) In urban areas where subsurface right-of-way is congested, the ability to detect the position and characteristics of underground obstacles or voids is important for maintenance, repair, and rehabilitation. 2) This research will provide guidelines for minimization of the effects of underground obstacles in SASW site characterization. Existing experimental and numerical studies indicate that underground obstacles and soil heterogeneity have significant effects on Rayleigh wave dispersion evaluated by the SASW test. This research will encompass a refinement of the numerical model for obstacle detection, verification of the developed procedures in detection of obstacles in soil systems and below pavements, and integration of the procedures into packages for an automated SASW test. The refinement involves optimization of the procedure with respect to the number, spacing and placement of receivers, and more accurate evaluation of some of the obstacle parameters. Verification and implementation of the procedure will be done in the laboratory and in the field. Test sites will be selected and prepared in cooperation with the New Jersey Department of Transportation. ***