擋土牆排水之數值模擬與分析

The Numerical Analysis of Retaining Wall Draining

李煜舲(Y. L Lee)

《地工技術》 85期 (2001/06) Pp. 51-60

https://doi.org/10.30140/SG.200106.0003

摘要

關於擋土牆排水設施功能之研究，其影響因素包含牆背後排水層之厚度與長度、水力傳導係數和土壤孔隙率等，藉由分析結果探討土壤內部之水頭、水力梯度、孔隙水壓和流量等變化量，以期提供設計參考之用，即為本文主要的研究目的。研究內容包含以有限元素分析程式模擬土壤排水之流線網分析，並解決三種排水設施之邊界值問題，包括牆身汲水孔排水法、貼牆直立式排水層加上牆身汲水孔排水法，以及水平式排水層法等。經由數值計算與分析結果得知，採用水平式排水層法能獲得較大之排水範圍，並能提供低水頭和高排水量之功能，其中排水層長度為主要影響因素；最後，提出三種排水設施參考用之孔隙水壓設計建議值。

關鍵字

汲水孔 ； 排水層 ； 水力傳導係數 ； 有限元素分析 ； 流線網

並列摘要

The influence of retaining wall draining facility on drainage is investigated in this research. The effects of retaining wall draining are taken into account the draining blanket, coefficient of hydraulic conductivity and soil porosity. The object of this study is related to the flow of water through soil that includes the head drop, hydraulic gradient, pore water pressure and flow rate. The finite element program is utilized to simulate the boundary value problem of retaining wall draining facility that includes three kinds of drainage facility, weep holes, weep holes with vertical draining blanket, and weep holes with horizontal draining blanket. According to results obtained, if the wall-back water level is quite high, horizontal draining blanket has the effort on reducing the water level and can drain more water. Finally, the values of pore pressure for the design of three kinds of drainage facility are proposed.

並列關鍵字

weep hole ； draining blanket ； coefficient of hydraulic conductivity ； finite element modeling ； flow nets