頁籤選單縮合
題名 | 山區林道挖方邊坡背拉式擋土排樁穩定工法力學參數研究=Mechanical Parameter Study of Tied-Back Retaining Pile Stabilization Method for Cut Slopes of Forest Roads in Mountain Areas |
---|---|
作者 | 林德貴; 王勝賢; 張國欽; 陳威翔; | 書刊名 | 中華水土保持學報 |
卷期 | 47:3 2016.09[民105.09] |
頁次 | 頁135-146 |
分類號 | 441.15 |
關鍵詞 | 三維有限元素數值分析; 背拉式擋土排樁; 錨碇段長度; 穩定性安全係數; 3-D finite element analyses; Three-dimensional finite element analyses; Tied-back retaining pile; Anchorage length; Factor safety of slope stability; |
語文 | 中文(Chinese) |
中文摘要 | 本研究針對宜專一線公路地滑區與背拉式地錨擋土排樁之監測結果,進行三維有限元素數值分析。同時,設置崩積層-均質邊坡及崩積層/岩層-異質邊坡,進行排樁及地錨參數研究。在數值模型中,選用地錨錨碇段長度L_g及傾角θ,以及排樁打設間距比S/D等參數,探討其對邊坡穩定性及排樁結構力學行為之影響。依據分析成果,排樁在崩積層/岩層-異質邊坡之穩定性安全係數FS,皆高於崩積層-均質邊坡者,此說明排樁樁尖貫入承載層之重要性。當排樁打設間距比S/D=6至8時,FS幾無變化;但當S/D=8至10時,FS會明顯降低。此乃由於排樁打設間距超過8倍樁徑後,排樁間之土拱效應消失所致。再者,當地錨之錨碇段長度為5至7 m時,崩積層-均質邊坡之FS明顯上升,而崩積層/岩層-異質邊坡之FS則微幅提升;而錨碇段長度為7至10 m時,兩者之FS皆趨於定值。 |
英文摘要 | This study performed a series of three-dimensional (3-D) finite element analyses to investigate the stabilization mechanism of the tied-back retaining pile installed at the Yi-Zhuan-No.1 Landslide. Meanwhile, a homogeneous slope of colluviums and heterogeneous slope of colluviums with bedrock underneath, were established to perform a systematic numerical experiment on various design parameters of the tie-back retaining pile. In numerical experiments, the design parameters consist of the anchorage length (L_g), inclination (θ) and the spacing ratio (S/D =pile spacing/pile diameter) of retaining pile. According to the numerical experiments, the FS value of a heterogeneous slope is always higher than that of a homogeneous slope and this demonstrates the importance of penetrating the retaining pile into the bedrock (bearing stratum) in the design. Moreover, the FS value greatly decreases as the installation spacing S value surpasses 8D (S ≥ 8D) and this indicates that the arching effect between two adjacent piles immediately disappears when the spacing of piles is larger than 8 times of pile diameter. In addition, the FS value of homogeneous slope is greatly promoted when the anchorage length L_g increase from 5 to 7 m while it is not the case for heterogeneous slope the increase is very rare. However, the FS values of the two types of fictitious slopes, become unchanged and tend to a constant when the L_g value increases from 7 to 10 m. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。