MÔ HÌNH THẤM NƯỚC MƯA PHỤC VỤ PHÂN TÍCH ỔN ĐỊNH SƯỜN DỐC KHU VỰC THỊ TRẤN CỐC PÀI - HUYỆN XÍN MẦN - TỈNH HÀ GIANG

Rainwater infiltration modelling for slope stability analysis in Coc Pai town-Xin Man distict-Ha Giang provinceRainfall plays an important role in formation of landslides by substantially changing the physico-mechanicalproperties of the soil such as soil weight, cohesion, friction angle, pore water pressure etc. For a given soil, thoseparameters are functions of soil moisture. Raiwater infiltration makes the change in soil moisture in space, especialliy in the depth and in time. One specific rainfall event shall give a specific rainwater infiltration and moisture distribution and therfore creates a specific distribution of physico-mechanical properties. Numerical moisture movement under given rainfall event whould give a precise moisture ditribution in soil and therefore can effectively serve the slope stability analysis and prediction. Rainwater infiltration and soil moisture movement modeling for the peak rainfall event in 2008 inCoc Pai town, Xin Man district, Ha Giang province has been carried out, which provides an important input for effectiveslope stability analysis and prediction of the area