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原文传递 Clay Seam Mapping With Electromagnetic Induction. Technical rept.

题名：	Clay Seam Mapping With Electromagnetic Induction. Technical rept.
作者：	Pfeiffer-J.; Hanna-K.
关键词：	Mapping-; Electromagnetic-fields.;New-Mexico; Roads-; Surface-rehabilitation; Location-detection.
摘要：	This report summarizes multi-phase geophysical demonstrations using various electromagnetic induction (EMI) methods on SR-537 near Dulce, New Mexico. The road has had extensive surface rehabilitation due to the presence of swelling clay-rich zones in the road base. Using electromagnetic geophysical methods with rapid acquisition procedures provided a means of detecting the location of potential swelling clay-rich zones. This information was used to guide the soil boring program, thus greatly reducing the risk of missing a clay-rich zone during the site characterization planning stage and thus preventing or minimizing cost-overruns during the reconstruction phase. The results from the three-phase investigation prompted a production survey along Natchez Trace Parkway, Mississippi. The combined results from Dulce and Natchez have shown that the EMI method can provide qualitative correlations for evaluating the roadbase materials. A comparison between individual Atterberg Limits of soils obtained from the soil lab analysis and the EMI data suggests that no direct correlation can be established. However, the correlation between the bulk conductivity and the Casagrande Plasticity Classification may be used as a quick evaluation tool for predicting Casagrande soil type along the entire length of the roadway surveyed.
报告类型：	科技报告