This study presents a procedure for calculating the change of the safety factor for unsaturated slopes of homogenous, residual soils suffering from rainfall infiltration within Khanh Vinh district, Khanh Hòa province. Rainfall is supposed as a main trigger caused failure of the potential sliding slopes. Rainwater into the slope due to infiltration caused an increase in moisture content and negative pore water pressure; a decrease in matric suction and in shear strength on the failure surface. Thus, slopes are reduced stability and can be failed. Soil permeability and rainfall intensity were found to be the primary factors controlling the instability of slopes due to rainfall, while the initial water table location and slope geometry only played a secondary role. A numerical model of analysis coupled seepage-stability used to simulate the seepage and slope stability under conditions of specific environment such as soil permeability, rainfall intensity, water table location and slope geometry in the study area. The relationships between safety factor and rainfall intensity, soil permeability, angle slope, high slope were identified to provide a good indication for the management of landslide hazards under the effects of rainfall.
A mathematical model was used by the authors (software developed by Dr. F28 Le Song Giang) to study the change of the salt boundary river systems Saigon - Dong Nai under the effect of sea level rise in the different cases for Ho Chi Minh City, taking into account the change of amplitude and phase shift of the South China Sea tide.
Results of the study indicated that:
1. There is a pretty good resemblance between model running results and results of water levels measurement. Salinity, calculated results have a larger amplitude slightly from measured data but this difference and oscillation phase can be acceptable.
2. Salinity 1 g / l - 3 g / l is increasingly encroaching into the infield under the sea level rise scenarios. Salt accounts is greater than 5 g / l and the margin of 10-15 g / l is also approaching deeply, so the future of Ho Chi Minh City will face to some water supply problems.
3. Saline in basin downstream Saigon - Dong Nai river is quite sensitive to the hydrological regime of the river, therefore, domestic regulation of irrigation reservoirs upstream can be used to push salt and improve salinity regime in the downstream part of the river
In this paper, a Monte Carlo simulation used to analyze probabilistic slope stability. The results including: probabilistic slope failure and reliability index with respect to factor of safety under the effects of uncertainties in the parameters of soil properties. Base on this informations, geotechnical engineers how to get optimal designs to prevent slope failure. In addition, the purpose of this paper is to show that standard deviation of soil properties can be applied in simple ways, without more data, time, or effort than are commonly available in geotechnical engineering practice. Applying Monte Carlo simulation to evaluate probabilistic slope stability on route Nha Trang - Da Lat.
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