由野外調查評估卵礫石層強度性質

Assessment of the Strength Properties of Gravel For-Mations by Field Investigation

10.29417/JCSWC.201203_43(1).0005

張光宗(Kuang-Tsung Chang)；鄭敏杰(Min-Chieh Cheng)；陳樹群(Shu-Chun Chen)

卵礫石層 ； 地形 ； 強度 ； Gravel　formation ； topography ； strength

中華水土保持學報

43卷1期（2012 / 03 / 01）

55 - 64

繁體中文

卵礫石層的強度過去多以室內或現地試驗評估，本研究調查卵礫石層邊坡的地質與地形特性，探討地質因子與卵礫石層強度的關聯性，以評估卵礫石層強度性質。由數值高程資料量取邊坡的坡高與坡度可定義強度指標，結果區分出調查區域卵礫石層強度由大到小依序為草湖溪、九九峰、筆石、大肚、新山、與八卦。此外由野外量測卵礫石層粒徑分佈、卵礫石面積百分比、基質強度與卵礫石強度地質特性，使用線性複迴歸分析可建立這些地質因子和卵礫石層強度指標的關係；並得知影響卵礫石層強度的因子，重要性依序是卵礫石含量（CG）、基質強度（qM）、粒徑大小（D30）與卵礫石強度（qG）。

The strength of gravel formations has long been studied by laboratory or in situ experiments. In this study, geological and topographical characteristics of gravel formations were examined to correlate geological factors and their strength. The topographical features of slopes such as height and inclination that define the strength indices of gravel formations were measured from the data of digital elevation models. Then, the strengths of the study areas were distinguished. The relationship between the strength index and the measured geological factors including the grain size distribution, area concentration of gravels, matrix strength, and gravel strength was established. The geological factors affecting the strength index from greatest to least were gravel content (CG), matrix strength (qM), particle size (D30), and gravel strength (qG).