| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 102 === In Taiwan, more than two third of land is mountain. As the country
continues to develop, people’s living places gradually expand into mountain
area. Rainstorm and typhoon often occur in summer and cause severe
damage. Thus, safety analysis in mountains becomes more and more
important.
When analyzing the factor of safety (FS) of a slope by conventional limit
equilibrium method, the slope is divided into a dry part and a fully saturated
part. Although a conservative FS can be obtained, it costs more in construction.
On the other hand, soil does not suddenly become fully saturated from a dry
situation. Saturation always changes from 0% to 100% gradually. As a result,
there is an unsaturated part in the slope.
From the literature, a special stress exists in the unsaturated soil, which is
named “suction stress“. Suction stress helps increase the effective stress in
the soil. Once effective stress gets higher, the FS of slope will increase too. It
not only makes the analytical result suitable in the current situation, but also
reduces the budget in the construction procedure.
The research conducts seepage analyses within the slope by Seep/w to
get the volumetric water content distribution and pressure head distribution in
the domain. Suction stress is than calculated analytically. Finally, limit
equilibrium analyses, including Ordinary Method and Simplified Bishop Method,
are carried out. The results are compared with the published data in literature.
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