Abstract
This study performs a series of rainfall-induced seepage and stability analyses of unsaturated slope using strength reduction method (SRM) of two-dimensional (2-D) finite element technique to inspect the efficiency of compound stabilization work adopted for the remediation of the down slope of T16-tower pier (or T16-Slope) situated at the hillside of Taipei City Mao- Kong tramway. The validities of numerical procedures and various material model parameters are verified by examining the triggering mechanism and occurrence time of landslide in T16-Slope during Jang-Mi typhoon in 2008. After the landslide in 2008, the potential sliding surfaces of T16-Slope with and without remediation are both developed at the up-middle-slope (the most critical sectional slope) where an RC-grid-beam (RC-grillage) and anchorage were constructed for remediation. The remediation enables to prevent the up-middle-slope from coming close to a critical state during torrential rainfall. The increasing FS value demonstrates the deterioration of the stability of up-middle-slope caused by groundwater rise can be mitigated by the stabilization effects of remediation. The analysis results also indicate that the stabilization effects of remediation can be greatly reduced after a rainfall with long duration and heavy intensity because of a strenuous infiltration of rainwater.
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