締固めた関東ロームの強度特性に関する研究(I) : 転圧による強度低下について

概要

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Kanto-Loam, one of volcanic ahes, has recently been used as a core material of earthfill dams. It has provided many problems in field compaction and in determining shear strength parameters, because of its peculiar physical properties involving extremely high water content and high plasticity. Among various subjects on the shear strength characteristics of Kanto-Loam, strength reduction (softening) due to roller compaction and thixotropic strength regain (hardening) after compaction are great concerns in the design and construction of earth dams. As the first report on the strength characteristics of compacted Kanto-Loam, quantitative study was first made in the present paper on the softening properties due to roller compaction through repeated triaxial compression tests. Laboratory results were then compared with field observations and some remarks were offered on the quality control of an existing earth dam under construction.