活化爐渣處理之泥岩介面之剪應力研究

Effects of Lime-activated Slags on the Interfacial Shear Strength of the Treated Mudstones

陳家駿(Judge K. Chen) ； 顏富士(Fu-Su Yen)

《鑛冶：中國鑛冶工程學會會刊》 36卷2期 (1992/06) Pp. 101-114

摘要

防止臺灣西南部地區泥岩表面遭受風化侵蝕之工程方法，多存有一嚴重之困擾，即人為之坡面保護，如：植生、水泥漿等，皆與原泥岩間形成一界面；而現場坡面之破壞，多肇因於此一界面之存在。本研究對以活化爐渣穩定泥岩坡面之工作，進行爐渣──泥岩間介面之力學觀察，必也面臨此界面之威脅。實驗結果顯示：以混合活化爐渣之重模泥岩覆蓋於原狀泥岩表面，原狀泥岩之含水量對此界面之剪力強度的影響較大。重模與原岩之介面顯然未能產生結合力。隨養治時間之增長，重模泥岩中之新礦物相逐漸增加，其主要生長於爐渣表面與較小孔隙中，造成封孔效果，並使泥岩顆粒膠結，改變泥岩之顯微結構與性質，使其遇水不易回脹、崩解。但此界面在較大垂直應力、原狀泥岩之含水量較高之情況下，剪力強度有下降較嚴重之趨勢。

並列摘要

A serious slope failure and surface erosion in the badland area in southwestern Taiwan was resulted from the swelling and slaking properties of the mudstones. Man-made protective covers, including vegetation, shotcrete etc., for slope stability and conservation would inevitably generate a contact of discontinuity between the artificial mantle and the mudstone surface underneath. From the former work, the remolded mudstones mixing with lime-activated slags would have a better anti-slaking capacity than the untreated mudstones. A study on the interfacial shear strength between the remolded and the untreated mudstones contact reveals that: 1. there is no significant cohesion existing in such an interface, 2. the water content of the mudstones underneath is a more important factor that causes decreasing of shear strength as the water content increases. In microtextural observations, new mineral phases which are formed on the grain surface and in the micropores, contribute cementation effects to the mudstones. After longer curing time, the remolded mudstones would have higher anti-slaking and anti-swelling capacities.