細料對不同級配之沉泥質砂動態與靜態強度之影響

Influence of Fines on Static and Cyclic Strengths of Silty Sands with Various Soil Particle Gradations

本文主要在探討細料對不同級配下沉泥質砂動態與靜態強度之影響。將前鎮河砂篩成A、B 和C 三種級配，並將通過ASTM #200 之土粒作為細料，分別控制混合料相對密度30%、50%、70%，細料含量0%、5%、15%、25%，研究結果顯示土壤之內摩擦角和液化強度會隨著細料越多而降低，三種級配之液化強度皆隨相對密度增加而增加。本文亦利用顆粒間孔隙比觀念，說明級配對土壤強度之影響可能與細料在土壤的角色有關。

The main purpose of this study is to investigate the influence of finescontent on static and cyclic behaviors of silty sands with different particlegradations. Three types of soil particle gradations, which are classified as A,B and C, were performed in sample sands from the Cian-Jhen riverside inKaohsiung. Meantime the fines requested are added to the testing sandpassing through an ASTM No.200 sieve. The relative densities of thespecimens were set by preparation at 30%, 50% and 70% respectively withdifferent fines contents of 0%, 5%, 15% and 25%. The results showed thatfine soil particles have a remarkable effect on the decrease of internalfriction angles and liquefaction resistance, and the relative densities of thespecimens also have significantly positive effects on liquefaction resistance.The paper utilized also the concept of intergranular void ratio to investigatethe correlation between the influence of fines on liquefaction resistance forsilty sands and feasible roles of fine particles within the soils.