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中文摘要：
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。
英文摘要：
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.
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