CAJ | 학술논문

为探究在平面应变条件下非饱和黄土的结构性发展规律及其抗剪强度与含水率之间的关系，进行了不同含水率、不同围压下的非饱和黄土平面应变试验。试验结果表明：陕西子洲非饱和黄土的应力应变曲线呈现强硬化性；平面应变条件下，非饱和黄土结构特性曲线分为上升段和稳定段两段，分界点为原状黄土应力应变曲线的转折点(斜率突变点)；最大结构应力分担比随着围压的增大而减小，随着含水率的增大而减小。针对试验样，给出了平面应变条件下非饱和原状黄土抗剪强度的计算公式，对实际工程有一定的参考价值。
위탐구재평면응변조건하비포화황토적결구성발전규률급기항전강도여함수솔지간적관계，진행료불동함수솔、불동위압하적비포화황토평면응변시험。시험결과표명：협서자주비포화황토적응력응변곡선정현강경화성；평면응변조건하，비포화황토결구특성곡선분위상승단화은정단량단，분계점위원상황토응력응변곡선적전절점(사솔돌변점)；최대결구응력분담비수착위압적증대이감소，수착함수솔적증대이감소。침대시험양，급출료평면응변조건하비포화원상황토항전강도적계산공식，대실제공정유일정적삼고개치。
To explore the development law of structural property of unsaturated loess and the relationship between its shear strength and water content under plane strain conditions, a series of plane strain tests for Shaanxi Zizhou loess under different moisture content and confining pressure were carried out. The tests results illustrate that:stress-strain curves of the unsaturated loess sample show strong hardening characteristic;under plane strain condition, the structure property curves of the unsaturated loess can be divided into two sections, namely ascending and stable sections, the demarcation point is the turning point of undis-turbed loess stress-strain curves ( slope saltation point);The maximum structural stress ratio decreases with the increase of con-fining pressure and water content. We provide a computational formula to calculate the shear strength of unsaturated undisturbed loess under plane strain conditions,which has certain reference value to the practical project.