未飽和崩積土靜態力學行為之初步探討

Abstract

本文係以未飽和重模之崩積土為試體進行無圍壓縮試驗,壓密係以 0.5kgf.cm^2之圍壓持續24小時之排水.為獲得未飽和試體壓密後之孔隙比 變化,乃利用陶瓷透水石來取代傳統之金鋼石透水石. (1)試體壓密前之不 排水剪力強度隨飽和度之增加而降低.(2)對試體壓密後孔隙比之減小與試 體於壓密後較壓密前之剪力強度改變量而言,新竹湖口崩積土皆較瑞芳金 瓜石崩積土為劇.(3)試體之無圍壓縮強度可以經驗公式表示,即: )+b}=M- N{log(S)+log(e)}其中:a,b,M,N皆為常數. The report takes unconfined compression test by remolded unsaturated colluvial deposit.Consolidation is carried out with the confining pressure 0.5kgf/cm^2 during 24 hours.In order to understand the variation of void ratio between,so the ceramic disk takes place of the traditional disk. The results shows that:(1)Before consolidation,the shear strength lowers by the increasement of degree of saturation. (2)About the reduction of the void ratio and the variation of the shear strength after consolidation,the soil of Hu-Ko are both serious than Chin-Qua- Shih.(3)The shear strength can be expressed as follows: log(Su)= a{log(w)}+b=M-N{log(S)+log(e)} where a,b,M,N are all constant.