caa a22 4500 467931232 CHVBK 20180406152944.0 cr unu---uuuuu 170328e20061001xx s 000 0 eng 10.1007/s10706-005-1881-8 doi (NATIONALLICENCE)springer-10.1007/s10706-005-1881-8 Water infiltration characteristics of unsaturated soil slope and its effect on suction and stability [Elektronische Daten] [Bujang Huat, Faisal Ali, T. Low] Rainfall has been considered the cause of the majority of slope failures and landslides that happened in regions experiencing high seasonal rainfalls. The mechanism of the failures was mainly due to the lost of matric suction of soils by rainwater. This paper presents the results of a laboratory model study on the effect of slope angle and surface cover on water infiltration into soil and soil matric suction. A field infiltration test is carried out for comparison. A parametric study is also done to examine the effect of permeability ratio, development of perched water table and rainfall intensity on the factor of safety against instability of a soil slope. Results of the model study show that different surface covers on slopes have an effect on the water infiltration. Generally the covered surface (grass or geosynthetic net) has a lower infiltration rate compared with the bare (no cover) surface. On the effect of slope angle, it was observed that water infiltration decrease with increase in the slope steepness. With regards to the movement of the wetting front, it appears that water infiltration is more at the toe compared with the top of the model slope. Based on the parametric study, it is found factor of safety of the slope against instability drops for slope with higher ratio of permeability for the permeable and impermeable stratum. As the perched water table is formed, the factor of safety decreased. The rainfall intensity also has a marked effect on the slope factor of safety. The higher the intensity of the rainfall, the higher is the infiltration rate into the soil, hence the lower is the factor of safety against slope instability. Springer, 2006 landslide nationallicence rainfall nationallicence slope stability nationallicence suction nationallicence unsaturated soil nationallicence water infiltration nationallicence Huat Bujang Department of Civil Engineering, University Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia aut Ali Faisal Department of Civil Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia aut Low T. Department of Civil Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia aut Geotechnical & Geological Engineering Kluwer Academic Publishers 24/5(2006-10-01), 1293-1306 0960-3182 24:5<1293 2006 24 10706 https://doi.org/10.1007/s10706-005-1881-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10706-005-1881-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Huat Bujang Department of Civil Engineering, University Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia aut NATIONALLICENCE 700 1- Ali Faisal Department of Civil Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia aut NATIONALLICENCE 700 1- Low T. Department of Civil Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia aut NATIONALLICENCE 773 0- Geotechnical & Geological Engineering Kluwer Academic Publishers 24/5(2006-10-01), 1293-1306 0960-3182 24:5<1293 2006 24 10706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer