| Summary: | 碩士 === 國立中興大學 === 水土保持學系 === 87 === ABSTRACT
Based on the infinite-slope and finite-slope stability analysis methods, a model of half-infinite slope was derived to predict landslide. This model contained the factors of original slope angle before landslide occurred, the cohesion and the angle of friction of soil, and the destruction of the toe of slope. Simulated results by the model have the same trend with experimental results. It was proved that these factors of the model influenced the active force to induce landslide. The results of experiment and analysis showed as follows:
1、The derived model for the acting force in this study was
2、With the same cutting length on the toe of slope, the steeper original slope angle was, the longer horizontal length and the less steepness of failure slope were caused on longitudinal cross section. The angle of failure slope on lateral cross section varied in a small range with the angle of slope increasing.
3、With the same angle of original slope, the longer cutting length increased, the longer horizontal failure length on longitudinal section increased with the same multiples.
4、The behaviors of depositing and sliding might not only affected by the longitudinal buttress force from the soil on the toe of slope but also by the sideward buttress force.
5、Smaller friction angle and cohesion would induce a larger landslide. And a slope with cohesive soil which had critical cutting length would not occur landsliding until the cutting length developed over the critical value.
6. A slope was not failure on normal times because that the cohesion of soil was not reduced. Once the cohesion force of soil was reduced due to the soil moisture rising by rainfall, the failure scale of landslide was depending on the variation of cohesion
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