https://scholars.lib.ntu.edu.tw/handle/123456789/37500
標題: | 邊坡破壞引發土石流之機制研究─子計畫:坡地災害中之地質環境特性探討(1/2) | 作者: | 陳宏宇 | 關鍵字: | 熔岩流;凝灰角礫岩;摩擦角;不連續面;lava flow;tufficious conglomerate;friction angle;discontinuities | 公開日期: | 2003 | 出版社: | 臺北市:國立臺灣大學地質科學系暨研究所 | 摘要: | 第二年的研究工作主要是了解金山地區兩湖坑及三和坑地區地質材料的各 項工程特性。從調查中可以發現在金山地區兩湖坑岩石含水量的變化並不大,由 實驗的結果顯示,熔岩流及凝灰角礫岩的岩體結構應本屬於較為緻密的情況,因 受到風化作用的影響,使得其結構變得略為鬆散。由消散耐久試驗的結果顯示其 抗風化能力都相當好,黏土礦物含量以依萊石佔絕大部分,其次為膨潤石。由於 澎潤石與伊萊石之活性很高,遇水後會產生膨脹現象,因此對坡體之穩定性會有 負面影響。兩輝安山岩之熔岩流節理面間夾泥的摩擦角為介於26°至33°之間, 與其基本摩擦角的範圍相似,但又較尖峰摩擦角於飽和狀態時低於10°左右。三 和坑地區發現有些岩層會被破裂面切割而形成獨立的岩塊,並且沿著破裂面滑 動,各不連續面組成之潛在性破壞模式包括平面破壞、楔形破壞或翻倒破壞等三 種。現地泥質砂岩在氣乾狀態之尖峰摩擦角介於30°至37°之間,在含水飽和狀 態下這些弱面試體則完全崩壞無法進行試驗。 The aims of the second year research are to comprehend the engineering characteristics in the Lienhuken and Shanherken of Chinshan area. The investigated results of Lienhuken show that the water contents have only little change in the study area. The lava flow and tufficious conglomerate have appeared loose state during the weathering process. The slaking test still demonstrates that both of the rock type has very high ability in the anti-weathering condition. The major composition of the clay minerals includes illite and semectite, which will occur the negative effect on the slope stability. The friction angle of the matrix in the lava flow ranges from 26° to33° 。 These results are similar with basic frictional angle but less than 10° in comparing the peal frictional angle. The rock basements were cut to individual block by weathering process in Shanherken area. These discontinuities were also formed of potential geometry modes of plane failure, wedge failure and toppling failure. The peak frictional angle of muddy sandstone ranges from 30° to 37°,and the weak plane will totally failure in saturated condition. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/11833 | 其他識別: | 912625Z002021 | Rights: | 國立臺灣大學地質科學系暨研究所 |
顯示於: | 地質科學系 |
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912625Z002021.pdf | 203.82 kB | Adobe PDF | 檢視/開啟 |
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