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Evaluating the Compaction Quality of Backfills by Stress Wave Velocities
In engineering practices, sand-cone tests were performed to access the compaction quality of backfilled materials of highway embankments or earth dams. However, performing a sand-cone test is time consuming and can only obtain the physical but not the engineering properties of backfills. The objective of this paper is to establish a systematic procedure based on stress wave propagation velocities to evaluate the quality and engineering properties of compacted backfills for the quality control of earth works. To achieve this goal, a low plasticity material used in the earth dam of the Hushan Reservoir was collected. Laboratory tests were performed on compacted samples of this material to obtain the calibration curves for the relationship between moisture content, dry density and stress wave velocities. Results of these tests indicate that there is a good correlation between the moisture content, dry density, CBR and the shear (S) wave velocity. Comparing with values measured in the field using traditional sand-cone test, the proposed method underestimates the moisture content and overestimates the dry density. However, the resulting error is less than 10%. It is thus concluded that the proposed method is a tool with high potential for the evaluation of the compaction quality of backfills.
Evaluating the Compaction Quality of Backfills by Stress Wave Velocities
In engineering practices, sand-cone tests were performed to access the compaction quality of backfilled materials of highway embankments or earth dams. However, performing a sand-cone test is time consuming and can only obtain the physical but not the engineering properties of backfills. The objective of this paper is to establish a systematic procedure based on stress wave propagation velocities to evaluate the quality and engineering properties of compacted backfills for the quality control of earth works. To achieve this goal, a low plasticity material used in the earth dam of the Hushan Reservoir was collected. Laboratory tests were performed on compacted samples of this material to obtain the calibration curves for the relationship between moisture content, dry density and stress wave velocities. Results of these tests indicate that there is a good correlation between the moisture content, dry density, CBR and the shear (S) wave velocity. Comparing with values measured in the field using traditional sand-cone test, the proposed method underestimates the moisture content and overestimates the dry density. However, the resulting error is less than 10%. It is thus concluded that the proposed method is a tool with high potential for the evaluation of the compaction quality of backfills.
Evaluating the Compaction Quality of Backfills by Stress Wave Velocities
Lai, Jiunnren (author) / Wu, Shengmin (author) / Chiang, Chih-Hung (author)
GeoHunan International Conference 2011 ; 2011 ; Hunan, China
2011-05-16
Conference paper
Electronic Resource
English
Evaluating the Compaction Quality of Backfills by Stress Wave Velocities
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