新埔大平窩地滑地之研究

Studies on the Nan-Pin landslide in Hsinchu

10.29417/JCSWC.198811_19(2).0002

謝豪榮(Hau-Jung Shieh)

地滑 ； 邊坡穩定 ； landslide ； slope stability

中華水土保持學報

19卷2期（1988 / 11 / 01）

14 - 28

繁體中文

本研究以新竹縣新埔鎮南平里地滑地爲試驗地，其目的乃利用各種調査方法之相互配合，以確實地把握其相對之移動量，地下水位及滑動深度並究明其滑動之原因及推算其安全係數，以便尋找有效之治理方法。本地滑地爲一淺層而複層型之地滑型態，最深之滑動層約在地面下7公尺左右。其滑動之主要原因乃由於逕流在滑動區內漫流與滲透而使土壤之間隙水壓增加與抗剪強度減少以及溪流之浸蝕與淘刷而使末端部懸空，缺少支撑而失去平衡之雙重作用所引起。邊坡穩定分析之結果，本地滑地爲圓弧型之破壞，BH10〜BH11斷面之安全係數在高水位時爲0.894，低水位時爲1.215；BH13〜BH14斷面之安全係數在高水位時爲0.839，低水位時爲1.103。

Nan-Pin landslide in Hsinchu profecture was taken as the experimental area. The purpose of this study was to assure the relative movement the ground water level and the location of sliding layer. The expansion gauge and pipe stain sauge were installed to observe the displacement of the ground, soil samples were taken from sliding layers to take direct shear test and triaxial compression test. From the test the factor of safety could be obtained. Nan-Pin landslide was one of the shallow complex layer type slide, the deepest slide plane was about 7M under the ground surface. There are many causes which induce land slide. Among them runoff overflowing on the sliding area, pore water pressure of soil was increased, shear strength was weaked and river erosion are the principal ones. The slide surface was near the circular surface, the safety factor of the BH10 ~ BH11 sliding layer was 0.894 in the highest ground water level and 1.215 In the lowest ground water level; the BH13 ~ BH14 sliding layer was 0.839 in the highest ground water level and 1.103 in the lowest ground water level.