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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 MaoKong 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 (RCgrillage) 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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