| Summary: | 碩士 === 逢甲大學 === 土木工程所 === 96 === In this thesis, sliding potential was investigated for a highway near the landslide area of Wushe. Through the case in this thesis, typical slope stability problems were depicted for hillslope fields located in a rainy and earthquake zone. Except field investigations of topography, geology, geologic structures, and tension cracks for the selected sliding area, large scale direct shear tests were performed such that more representative shear strength parameters were obtained for the sliding failure planes. By adopting slope stability programs developed by the thesis advisor for both 3D-wedge and 2-plane sliding faulures, factors of safety were obtained within the periods of normal, torrential rain, and earthquake, respectively, under the conditions of field geometry, boundary, loading, and pore water pressure distribution, etc. Results from this thesis reveal that (1) It is the infiltrated water in the tension crack and the sliding plane, but not the ground water table that can hardly be observed, that should be considered in a slope stability analysis for a laminated rock/soil slope; (2) It is easy for the rain to fill tension crack and sliding plane to the full such that factor of safety goes down tremendously; (3) Since geologic structures are special in this case, the resulting factor of safety is reduced to 1.0 when the coefficient of horizontal earthquake is only as large as 0.1g; (4) Earthquake forces rock/soil to crack and torrential rain makes the cracked slope slid such that the delayered sliding failure is a typical problem for the hillside field in rainy and earthquake zone.
|
|---|
