地工監測儀器配合三維變形量測方法於邊坡安全監測之應用及其精度分析

Application of Geotechnical Instruments and 3-D Deformation Measuring Method to Monitor Slope Stability and Study of Its Accuracy

李文貴(Wen-Kuei Li) ； 陳堯中(Yao-Chung Chen) ； 彭嚴儒(Yan-Ru Peng)

《中國土木水利工程學刊》 23卷3期 (2011/09) Pp. 297-306

https://doi.org/10.6652/JoCICHE.201109_23(3).0006

摘要

三維變形量測方法可量測得測點之絕對變形量，本研究將此方法應用於某公路邊坡之安全監測，藉由實際案例之現場測量並與傾度管等其他監測儀器成果互相比較，檢驗此三維變形量測方法之成效及其精度。自由測站法之監測成果顯示，所監測點位之三維中誤差值介於1.2 ~ 1.9 mm間。經由持續兩年之監測顯示，三維變形量測方法之監測結果與傾度管之結果相當一致，本區邊坡受豪大雨及季節性降雨之影響甚鉅，潛在滑動面之移動方向與順向坡地層之傾向一致，且與地層中頁岩材料浸水弱化有關。但地表位移方向，受地表逕流沖刷影響、並不全然與層面傾向一致。

關鍵字

三維變形量測 ； 自由測站法 ； 傾度管 ； 邊坡穩

並列摘要

The 3-D deformation measuring method can obtain absolute displacements of the surveying points. This research applied this method to monitor the stability of a cut slope and compared the results with other monitoring methods. The suitability of this method and its accuracy was investigated. Monitoring results of free station method showed that the errors were in the range of 1.2 ~ 1.9 mm. From the results of a two-year monitoring program, 3-D deformation measuring method was confirmed to be consistent with other methods and they were all closely related to seasonal rainfall. The sliding direction of the potential sliding surface was consistent with the dip direction of the dip slope, and was closely related to the weakening of the shale when submerged under water. The sliding direction of the ground surface, on the other hand, was not quite consistent with dip direction due to the erosion by runoff.

並列關鍵字

3-D displacement measurements ； free station method ； inclinometer ； slope stability