A Study on Suction-rainfall Response of a Cut Slope in Unsaturated Residual Soil Using a Field Rain Simulator | Science Publications

American Journal of Environmental Sciences

Bujang B.K. Huat¹  Faisal H. Ali¹  S. Mariappan¹ 

关键词: Cut Slope;    Infiltratio;    Landslide;    Rainfall;    Suction;    Unsaturated Residual Soils;   

DOI  :  10.3844/ajessp.2005.11.15

学科分类：环境科学（综合）

来源: Science Publications

【 摘 要 】

This research describes the design and construction of an artificial rain simulator system andthe results obtained with regards to suction-rainfall response of a cut slope in unsaturated residual soilof weathered sandstone of various weathering grades. From the field measurements, the shallowtensiometers are found to record an immediate initial increase in matric suction within the first 20 minof the simulated rain before a gradual drop in suction takes place. However no such initial spikes insuction readings were recorded by the deeper tensiometers. With constant rainfall for the next 130 min,a clear drop in soil suction was observed in all cases illustrating the effect of net infiltration process.Positive pore water pressure was even recorded by some of the deeper tensiometers. The suctionrecorded by the shallow tensiometers was always higher than those of the deeper tensiometers,indicating a reduction in suction with depth below the ground surface. In term of weathering grades,residual soil of weathered sandstone of weathering grade III has the highest infiltration rate indicatingthe more porous nature of this soil material. Like wise there is a steeper drop in suction during the rainat the said location.

【 授权许可】

Unknown