CAJ | 학술논문

使用 WF 循环单剪试验系统,对不同法向应力、不同含水率的非饱和砂土在单向剪切作用下的力学特性进行了系统的试验研究.砂土含水率为5.4%~25.4%,法向应力为25~300 kPa,主要考察含水率、法向应力对非饱和砂土力学特性的影响规律.试验结果表明：存在一个临界含水率,当非饱和砂土含水率大于该临界含水率时,其剪切应力剪切位移关系将由双曲线函数变为双折线函数.当非饱和砂土含水率小于临界含水率时,非饱和砂土的抗剪强度随含水率增大变化幅度较小.当含水率高于该点后,抗剪强度随含水率增大急剧降低.含水率对土的黏聚力、内摩擦角、剪胀性等力学特性具有重要影响.
사용 WF 순배단전시험계통,대불동법향응력、불동함수솔적비포화사토재단향전절작용하적역학특성진행료계통적시험연구.사토함수솔위5.4%~25.4%,법향응력위25~300 kPa,주요고찰함수솔、법향응력대비포화사토역학특성적영향규률.시험결과표명：존재일개림계함수솔,당비포화사토함수솔대우해림계함수솔시,기전절응력전절위이관계장유쌍곡선함수변위쌍절선함수.당비포화사토함수솔소우림계함수솔시,비포화사토적항전강도수함수솔증대변화폭도교소.당함수솔고우해점후,항전강도수함수솔증대급극강저.함수솔대토적점취력、내마찰각、전창성등역학특성구유중요영향.
The mechanical properties of unsaturated soil under different normal stresses and water con-tents were systematically studied with the cyclic simple shear test,where the water content is 5 .4%~25.4% and the normal stress ranges from 25 kPa to 300 kPa.It mainly investigated the influence of the normal stress and water content on the mechanical properties of unsaturated sandy soil.Experimental re-sults show that there is an equilibrium water content.When water content is greater than the equilibrium water content,the curve of the shear stress and shear displacement of unsaturated sand soil will change from hyperbolic to Double Broken Line model.The shear stress changes in small range when the water content of the unsaturated sand soil is under the equilibrium point.Whereas the shear stress drops sharply as the water content increases .The water content has important influence on the mechanic performance of unsaturated sandy soil,such as cohesion,internal friction,dilatancy and so on.