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Control of Embankment Settlement Field Verification on PCPT Prediction Methods, Summary
Depending on loading and embankment height, the magnitude and progression of settlement can signifi cantly impact the safety and serviceability of the infrastructures that are constructed on saturated fi ne-grained soils. Therefore, the construction of embankments, bridge abutments, and other structures on such soils requires a reasonable estimate of the magnitude and time-rate of consolidation of the natural soil deposits in order to conduct a rational and safe analysis and design of these structures. Calculation of embankment settlement is usually made by using Terzaghis consolidation theory based on laboratory tests. Laboratory tests, such as the oedometer consolidation test, are usually conducted on small intact samples recovered from embankment sites at selected depths. Inevitable sample disturbance makes consolidation parameters obtained from laboratory tests not truly representative of the actual in-situ conditions. Moreover, laboratory testing has great diffi culty interpreting interbedded soils due to the limited number of samples. In contrast to laboratory tests, the piezocone penetration test (PCPT) can provide reliable results similar to laboratory tests in evaluating the actual strength and consolidation properties of the soil under in-situ stress and drainage conditions. PCPT has gained wide popularity and acceptance for subsurface investigation and soil characterization. PCPT is a robust, fast, and economical in-situ test that can provide continuous soundings of subsurface soil with depth. A research project was conducted previously at the Louisiana Transportation Research Center (LTRC) to evaluate the current PCPT interpretation methods for their capability to accurately predict the consolidation parameters needed to calculate the magnitude and time-rate of consolidation settlement of cohesive soils as well as the overconsolidation ratio (OCR). The previous research recommended new interpretation methods for constrained modulus and the Teh and Houlsby method for horizontal coeffi cient of consolidation. In this study, more embankment sites were selected to verify the settlement prediction method based on PCPT and dissipation tests.
Control of Embankment Settlement Field Verification on PCPT Prediction Methods, Summary
Depending on loading and embankment height, the magnitude and progression of settlement can signifi cantly impact the safety and serviceability of the infrastructures that are constructed on saturated fi ne-grained soils. Therefore, the construction of embankments, bridge abutments, and other structures on such soils requires a reasonable estimate of the magnitude and time-rate of consolidation of the natural soil deposits in order to conduct a rational and safe analysis and design of these structures. Calculation of embankment settlement is usually made by using Terzaghis consolidation theory based on laboratory tests. Laboratory tests, such as the oedometer consolidation test, are usually conducted on small intact samples recovered from embankment sites at selected depths. Inevitable sample disturbance makes consolidation parameters obtained from laboratory tests not truly representative of the actual in-situ conditions. Moreover, laboratory testing has great diffi culty interpreting interbedded soils due to the limited number of samples. In contrast to laboratory tests, the piezocone penetration test (PCPT) can provide reliable results similar to laboratory tests in evaluating the actual strength and consolidation properties of the soil under in-situ stress and drainage conditions. PCPT has gained wide popularity and acceptance for subsurface investigation and soil characterization. PCPT is a robust, fast, and economical in-situ test that can provide continuous soundings of subsurface soil with depth. A research project was conducted previously at the Louisiana Transportation Research Center (LTRC) to evaluate the current PCPT interpretation methods for their capability to accurately predict the consolidation parameters needed to calculate the magnitude and time-rate of consolidation settlement of cohesive soils as well as the overconsolidation ratio (OCR). The previous research recommended new interpretation methods for constrained modulus and the Teh and Houlsby method for horizontal coeffi cient of consolidation. In this study, more embankment sites were selected to verify the settlement prediction method based on PCPT and dissipation tests.
Control of Embankment Settlement Field Verification on PCPT Prediction Methods, Summary
M. Y. Abu-Farsakh (author)
2011
2 pages
Report
No indication
English
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