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標題: Evaluating the Efficiency of Stability Remediation Measures for the T16-Tower Pier Slope of the Taipei Maokong Tramway
台北貓空纜車 T16-墩柱邊坡 (T16-邊坡) 複合型整治工程之效益評估
作者: Der-Guey Lin
Kuo-Ching Chang
Jui-Ching Chou
關鍵字: Finite element technique
strength reduction method
compound stabilization work
rainfall-induced seepage
stability analyses
Relative Factor of Safety
強度折減法 (SRM)
相對安全係數 (RFS)
摘要: In this study, a series of rainfall-induced seepage and slope stability analyses was performed using the strength reduction method of two-dimensional finite element technique to inspect the efficiency of remediation measures for the down slope of the T16-tower pier (or T16-Slope), which is located on the hillside of Taipei City Maokong tramway. The compound stabilization work of the T16-Slope comprises four types of engineering methods, namely up-slope, up-middle-slope, middle-slope, and down-slope engineering methods. The numerical model and input parameters were calibrated by inspecting the coincidence between numerical results and field observations for the triggering mechanism and occurrence time of landslide in T16-Slope during Typhoon Jangmi in 2008. After the aforementioned landslide in 2008, the potential sliding surfaces of the T16-Slope with and without remediation measures were both developed at the up-middle-slope, where a RC-grid-beam (RC-grillage) and anchorage had been constructed for remediation. Under 48-hour rainfall over a 50-year return period, the minimum time-dependent factors of safety FS(t) with and without remediation measures were FSwith(t)=1.191 and FSwithout(t)=1.004 respectively. The remediation measures prevented the up-middle-slope from reaching a critical state (FS = 1.0) during torrential rainfall. In this study, the relative factor of safety (RFS; RFS =FS(t)with/FS(t)without) was used to evaluate the efficiency of the remediation measures to protect slope stability. The RFS was highest (RFS=1.279) under the initial dry condition and lowest (RFS=1.145) during rainfall duration t=30 hours under design rainfall. The RFS values indicated that the stabilization effects of the remediation measures were significantly lower after prolonged heavy rainfall because of severe rainwater infiltration.
本研究採用 2D 有限元素強度折減法 (SRM),執行一系列降雨入滲和邊坡穩定性分析,檢核台北 市貓空纜車 T16-墩柱下方邊坡 (稱 T16-邊坡) 複合型整治工程之邊坡穩定效益。T16-邊坡複合型整治工程從 上段、中上段、中段和下段邊坡,分別由四種工法組成。藉由比對 2008 年薔蜜 (Jang-Mi) 颱風期間現場觀測 之 T16-邊坡崩塌機制和發生時間,驗證數值分析模型和材料參數之有效性。數值分析結果顯示,T16-邊坡於 2008 年發生崩塌後,邊坡整治前、後之潛在滑動面皆發展於中上段邊坡 (最關鍵區段邊坡),該處邊坡採用 RC 格梁地錨工法進行整治。在 50 年重現期距 48 小時設計降雨條件下,整治前、後最小安全係數分別為 1.004 (FS(t)整治前) 和 1.191(FS(t)整治後),顯示整治工程可避免中上段邊坡在暴雨期間之安全係數趨近於臨界狀態 (FS=1.0)。本研究採用相對安全係數 RFS (= FS(t)整治後/ FS(t)整治前) 評估整治工程對邊坡穩定性之貢獻度。在未降 雨時,整治工程對邊坡穩定效果最好,RFS 最高值達 1.279,在 50 年重現期距 48 小時設計降雨條件下,當降 雨延時 t=30hrs 時,RFS 則下降到最小值 1.145,顯示長延時劇烈降雨後,因雨水入滲影響,降低整治工程的 穩定效應。
Appears in Collections:第49卷 第04期



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