臺北市大型順向坡地質調查～以南港軍人公墓為例

Geological Survey of Large Dip Slope in Taipei City-Case Study for Nangang Military Cemetery

王存欵(C. Wang) ； 池蘭生(L. S. Chih) ； 陳建帆(C. F. Chen) ； 邱亭瑋(T. W Chiu)

《水保技術》 15卷4期 (2021/12) Pp. 28-37

摘要

近年來由於都市發展擴張所需，開發區域逐漸向山坡地發展，而開發時未做妥當保護措施造成臺北市鄰近地區先後發生數起山坡地災害案例，其中尤以順向坡岩層滑動之災害規模較大且經常造成嚴重生命財產損失。有鑑於此，針對順向坡地形之調查及安全管理成為一重要課題。本研究以南港軍人公墓為案例，並根據現地及鑽探調查結果以及監測結果進行探討。調查結果顯示，基地內無岩層自由端出露形成可能滑動之情形，基地西側之格樑護坡地下水入滲及流動性良好，建議可加強坡面及地下水之洩水，確保邊坡穩定；另監測結果顯示砂頁岩互層因地表水不易入滲而形成阻水層，未來須注意此層上部覆蓋層之地下水位上升影響邊坡穩定及安全性。

關鍵字

順向坡 ； 岩層自由端 ； 砂頁岩互層 ； 阻水層

並列摘要

In recent years, due to the expansion of urban development, the developing area has gradually expanded into hillside area. Because of improper protection measures, several disasters happened near the Taipei city during development, especially the landslide of dip slope, and thus caused severe loss of life and property. In view of this, the survey and safety management of the dip slope has become an important issue. This study takes Nangang Military Cemetery as a case and discusses it based on investigation, on-site drilling and monitoring results. The results show that there is no possible sliding disaster due to the rock formation in the study area, and it's good with the infiltration and fluidity of the groundwater in the westside of the study area. To ensure the stability of the slope, it is recommended to strengthen the slope and groundwater discharge. On the other hand, the monitoring results show that the top of the sandstone-shale interface forms aquitard because it is not easy for surface water to infiltrate. It must pay attention whether the groundwater pressure may affect the stability and safety of the slope.

並列關鍵字

dip slope ； the free end of rock formation ； the sandstone-shale interface ； aquitard