Site Investigation and Numerical Simulation Analyses of a Failed Slope at Salihsien

• Main Authors: Ren-De Huang, 黃仁德
• Other Authors: Sung-Chi Hsu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/61076570672716396076

碩士 === 朝陽科技大學 === 營建工程系碩士班 === 102 === Heavy rainfall in mountain areas brought by typhoons and during raining season had caused serious flood, landslide, and debris flow in Taiwan. There is necessary to have some ways to protect the slopes and set up disaster warning system or range at those areas. The results of numerical simulation of this study can be used as disaster prevention, control, and evacuation. This study is located at Tong-Pu Village, Shin-Ye Township, Nantou County, and is close to the intersection of upstream of Chenyulan River and downstream of Salishan Creek. In-situ sampling, boring, index property tests, and compaction tests have performed to obtain the related index properties and optimum water content, which is around 5~7%. The estimated depth of rock formation is about 30m below the ground surface. Large and regular direct shear tests are used to acquire the saturated and unsaturated shear strength parameters for the colluvium soils. Soil water characteristic curve for the soils are based on the results of pressure plate tests. Guelph permeameter is used to obtain the in situ permeability for the soils. These testing results and related parameters are used for the numerical programs, SEEP/W and SLOPE/W, developed by Geo-Studio. Numerical simulations are performed to obtain the minimum friction angle of the soils, around 35 degrees, while the cohesion is set as 5kPa. The bottom of the sliding surface of the failed slope under extreme rainfall condition is usually located at the interface of soil/rock formation. Larger sliding block is occurred as the thickness of the colluvium is larger.