직접전단시험을 통한 섬유 및 시멘트 슬러리 기둥이 혼합된 소형 모래 공시체의 강도 특성

초록

Vegetation roots can increase ground mechanical stability, and many studies emulate this effect by randomly mixing fibers into soils. In this study, fiber bundles and cement slurry columns were embedded in uniform, columnar forms perpendicular to the shear direction rather than mixed randomly. Direct shear tests were conducted to investigate the effects of relative density, fiber content, and the distribution of cement slurry columns (having equal volume to the fiber bundles) on shear strength. The combined influence of fibers and cementation on sand shear strength was also evaluated. Results show that both fiber bundles and cement slurry columns increase peak shear strength. The internal friction angle of fiber-reinforced sand increased from 35° to 38° in loose specimens and up to 41° in dense specimens. Cohesion of sand reinforced with cement slurry increased from 0 kPa to 190 kPa in loose sand and from 11 kPa to 230 kPa in dense sand. Distributing the same fiber volume across multiple insertion points further improved shear strength. When both materials were combined, simultaneous increases in internal friction angle and cohesion were observed.

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