英文篇名
THE TECHNICAL TREATMENTS FOR THE MUDSTONE SLOPE STABILIZATION
作者
李德河、林宏明、楊沂恩
關鍵字
泥岩、邊坡穩定、坡地災害
摘要
我國的泥岩地層主要出露於西南部麓山帶、東部海岸山脈南端及恆春半島等處,而西南部麓山帶,則是泥岩出露面積最廣的地區,涵蓋面積約為一千四百平方公里。泥岩形成於第三紀的末期及第四紀前期,成岩時間較短,強度較低,遇水後易產生回脹、崩解的現象,抵抗外在環境的能力較差,特別是水的影響。因此,在泥岩地區每逢大雨後,小型崩落及泥流等地質災害則是處處可見,長期則形成蝕溝發達、地表裸露的惡地形,此區域隨著各項大型交通建設如第二高速公路、東西向快速道路的興建,在公路沿線產生大量的切削邊坡,由於邊坡保護設施的設置並非完善,因此每逢雨季常見泥流、邊坡侵蝕等土砂災害,對人民安全造成相當的威脅。因此,在泥岩區特有的地質條件下,如何建立適用的邊坡保護工法,乃是相當值得重視的事情,本文中乃就現有泥岩邊坡保護工法之現況及其成效做一探討,並提供作為爾後泥岩邊坡穩定處理之參考。
英文摘要
The mudstone stratum in Taiwan is mainly exposed in the southwestern foothills, the southern area of Coastal Range at eastern Taiwan, and the Hengchun peninsula. Among them, the most widespread area of exposed mudstone is the southwestern foothill with about 1,400 square kilometers. This mudstone formation is deposited from the late Tertiary to the early Quaternary. Due to the shorter digenetic period, it has some unfavorable properties such as lower strength, swelling and slaking behaviors, lower resistance of weathering, etc. Recently, several important transportation constructions, e.g. the southern part of the 2nd national highway and the east-west high speed highway, were built through these areas and caused extensive excavations of the mudstone slopes. Serious geologic hazards, such as collapses of retaining walls, failures and erosion of slope, mudflow, exposed vegetation slope, were frequently found after a torrential rain. Hence, how to establish a suitable technical treatment to protect the mudstone slopes becomes an important issue in Taiwan. This paper presents an evaluation results of the protecting methods in use for mudstone slopes and discusses the mechanism of some failure slopes. It may be a helpful reference for the technical treatments of mudstone slope stabilization in the future.