Loess Landform Inheritance: Modeling and Discovery by Li-Yang Xiong & Guo-An Tang

Author:Li-Yang Xiong & Guo-An Tang
Language: eng
Format: epub
ISBN: 9789811364044
Publisher: Springer Singapore

During the geophysical prospecting process, the geological drillings were nearly regularly distributed along the highway and were used as references for assessing the geophysical prospecting results. These drillings were acquired by using XY-100 and GJ150S hydraulic feed drills according to the standards of the Code for Investigation of Geotechnical Engineering (GB50021-2001).

The seismic refraction method was applied as the geophysical prospecting technique for exploring the highway roadbeds. The thickness and elastic wave velocity of the covering layers above the paleotopography were obtained, and the geophysical prospecting profiles were acquired by using the SE2404NT distributed digital seismograph acquisition system. A comparison between the results for the drilling and seismic refraction wave velocity of the underlying layers revealed velocity ranges of 500–850 m/s (the Malan loess strata or late Pleistocene loess), 850–1500 m/s (combined loess strata of Lishi and Wucheng or the middle Pleistocene loess), and above 1850 m/s (the pre-Quaternary loess underlying paleotopography, including the bedrock terrain and red clay layer). The other loess strata were excluded from this research because of the missing loess layer sequences in the vertical direction and the spatial variation in the loess layers in the horizontal direction.

3.Reconstructed underlying terrain profiles of the highway

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