TY - GEN
T1 - Rapid Compression Test of Cement-treated Sands
AU - Namikawa, Tsutomu
AU - Usui, Hayato
N1 - Publisher Copyright:
© 2019, Springer International Publishing AG, part of Springer Nature.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2019
Y1 - 2019
N2 - During earthquakes, dynamic loads caused by inertia forces are applied to ground improvements by deep mixing method. Therefore, the internal stability of cement-treated soil ground subjected to the seismic loading should be examined in the seismic design of the ground improvement. The speed of the loading caused by the inertia forces during earthquakes is much faster than that in the standard unconfined compression test. It is well known that the loading speed affects the strength of materials. Therefore, the strength under the rapid loading conditions is required to design the ground improvements rationally. The unconfined compression tests of cement-treated soils were conducted under the rapid loading conditions in this study. The rapid load in the shape of a solitary wave is applied to the specimens. The unconfined compression tests with the strain rate of 1%/min were also conducted for comparison. The experimental result indicates that the rapid loading increases the strength by about 20% as compared with the strain controlled loading. The test results were analyzed with the statistical manner to evaluate the variation of the strength of the cement-treated soil specimens prepared in a laboratory. The statistical analysis provides the good understanding of the influence of the data variation on the relationship between the strengths obtained from the rapid loading and strain controlled tests.
AB - During earthquakes, dynamic loads caused by inertia forces are applied to ground improvements by deep mixing method. Therefore, the internal stability of cement-treated soil ground subjected to the seismic loading should be examined in the seismic design of the ground improvement. The speed of the loading caused by the inertia forces during earthquakes is much faster than that in the standard unconfined compression test. It is well known that the loading speed affects the strength of materials. Therefore, the strength under the rapid loading conditions is required to design the ground improvements rationally. The unconfined compression tests of cement-treated soils were conducted under the rapid loading conditions in this study. The rapid load in the shape of a solitary wave is applied to the specimens. The unconfined compression tests with the strain rate of 1%/min were also conducted for comparison. The experimental result indicates that the rapid loading increases the strength by about 20% as compared with the strain controlled loading. The test results were analyzed with the statistical manner to evaluate the variation of the strength of the cement-treated soil specimens prepared in a laboratory. The statistical analysis provides the good understanding of the influence of the data variation on the relationship between the strengths obtained from the rapid loading and strain controlled tests.
KW - Cement-treated Soil
KW - Deep Mixing Method
KW - Humanitarian Grounds
KW - Rapid Loading Tests
KW - Unconfined Compression Tests
UR - http://www.scopus.com/inward/record.url?scp=85101579046&partnerID=8YFLogxK
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U2 - 10.1007/978-3-319-95753-1_3
DO - 10.1007/978-3-319-95753-1_3
M3 - Conference contribution
AN - SCOPUS:85101579046
SN - 9783319957524
T3 - Sustainable Civil Infrastructures
SP - 26
EP - 35
BT - Sustainable Design and Construction for Geomaterials and Geostructures - Proceedings of the 5th GeoChina International Conference 2018 – Civil Infrastructures Confronting Severe Weathers and Climate Changes
A2 - Fatahi, Behzad
A2 - Mwanza, Aron
A2 - Chang, Dave T.
PB - Springer Science and Business Media B.V.
T2 - 5th GeoChina International Conference on Civil Infrastructures Confronting Severe Weathers and Climate Changes: From Failure to Sustainability, 2018
Y2 - 23 July 2018 through 25 July 2018
ER -