The Influence of Rainfall Infiltration on the Slope Stability

• Main Authors: Zheng-Long Zheng, 鄭正隆
• Other Authors: Te-Hsing Chang
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/45452565528918944744

碩士 === 中原大學 === 土木工程研究所 === 92 === At present, most analyses of slope stability don’t include influence of rainfall infiltration. They only emphasize the analysis under a specific soil and environment conditions, so we just learn whether it’s safety under a condition of that slope. If it was destroyed under a condition of that slope, the analysis won’t show when the collapse will happen. It’s essential to analyze the slope stability depending on time’s changing because the analysis method can predict when the destruction might happen under a specific soil and environment conditions. The research use two sorts of slopes－flat and crack slope to combine the knowledge and methods of rainfall, infiltration, and slope stability, applies 3D-FEMWATER in simulating the soil moisture content after a rainfall depending on time’s changing, and the increase and decrease of groundwater. Next, there are different soil parameters in different moisture content. Then, it applies the mode of STABL to count each stage the relations between safety factors of slope and time. According to simulated result of slope depending on time’s changing, we learn that the slope factor of safety will change which depends on rainfall infiltration. Factor of safety (F.S.) of crack slop has much changing than F.S. of flat slop by raining 12 hours to accumulate the rainfall of 100mm. Thus, the slope with crack is influenced much by rainfall infiltration. From the result of analysis, it shows the relations between F.S and time. It will destroy when F.S is under 1.0, and we can estimate when will destroy after slope rainfall infiltration. Then, we can establish the warning system of slope safety.