Open AccessJournal Article
Discussion of "Unified Approach to Ground Improvement by Heavy Tamping"
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TLDR
In this paper, a review of heavy tamping projects indicated that highly organic clays which due to their secondary compression characteristics may not be amenable to treatment by surcharge and vertical drain installation alone, may nevertheless be stabilized by applying high energy impact on installed dynamic replacement (DR) sand columns using a conventional dynamic consolidation plant.Abstract:
A world-wide review of heavy tamping projects indicated that highly organic clays which due to their secondary compression characteristics may not be amenable to treatment by surcharge and vertical drain installation alone, may nevertheless be stabilized by applying high energy impact on installed dynamic replacement (DR) sand columns using a conventional dynamic consolidation plant. Field trials were thus conducted to enforce primary, as well as to negate secondary, compression of in situ peaty clay deposits by this form of treatment application, in the course of which dynamic replacement and mixing (DRM) of such soils with sand charges was originally identified as a distinct ground-improvement mechanism. From the field results and review, it is also perceived that ground-improvement mechanisms resulting from the application of a wide variety of heavy tamping plant and procedures to soils ranging from granular to highly organic cohesive materials may be generalized on a common physical basis. Further, unique relations may apparently be construed between alternative measures of degree of ground improvement on the one hand, and a collective term incorporating initial soil consistency and standard operational parameters of ground treatment on the other, thereby providing a basis for rational performance design.read more
Citations
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Instability of Granular Soils under Strain Path Testing
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TL;DR: In this paper, a strain-path testing technique was used to constrain the strain development of a triaxial sample along a constant strain-increment-ratio path.
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Dynamic Compaction Analysis
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Strain‐Softening Behavior of Granular Soil in Strain‐Path Testing
J. Chu,S. ‐C. R. Lo,I. K. Lee +2 more
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References
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Journal ArticleDOI
Ground response to dynamic compaction of dry sand
Q. Gu,Fook Hou Lee +1 more
TL;DR: In this paper, the authors studied the mechanics of dynamic compaction using two-dimensional finite element analyses with a large-strain dynamic formulation and a cap model for soil behavior.
Journal ArticleDOI
Field study on the reinforcement of collapsible loess using dynamic compaction
TL;DR: In this paper, the authors applied dynamic compaction with a maximum energy level of 12,000kN·m to a collapsible loess site in the city of Qingyang in the Gansu Province in northwestern China.
Journal ArticleDOI
Instability of Granular Soils under Strain Path Testing
J. Chu,S. ‐C. R. Lo,I. K. Lee +2 more
TL;DR: In this paper, a strain-path testing technique was used to constrain the strain development of a triaxial sample along a constant strain-increment-ratio path.
Journal ArticleDOI
Dynamic Compaction Analysis
TL;DR: In this paper, a simplified model based on the one-dimensional wave equation was proposed to account for the interaction of the pounder and the soil, and the propagation of stress wave in the soil during the dynamic compaction of loose granular soil.
Journal ArticleDOI
Strain‐Softening Behavior of Granular Soil in Strain‐Path Testing
J. Chu,S. ‐C. R. Lo,I. K. Lee +2 more
TL;DR: In this article, the authors investigated the strain-softening response of a granular soil along a wide spectrum of strain paths and established the conditions for the occurrence of prefailure or post-failure strain softening.