非饱和重塑黄土强度与屈服特性试验研究

为研究非饱和重塑黄土的强度与屈服特性，在控制吸力的条件下以黄土三轴剪切试验为基础，研究了重塑黄土的应力-应变曲线、强度与屈服特性。试验结果表明：在试验控制吸力条件下，重塑黄土的破坏形式均呈塑形破坏；在同一吸力、不同净围压作用下，重塑黄土从理想塑形破坏（或弱硬化型）向强硬化型发展；在p-q面内，强度包线几乎呈直线；黏聚力c随吸力增大而增大，但内摩擦角φ变化较小；不同吸力作用下，重塑黄土的εr-log（q／p）关系曲线呈三阶段分布，得到了非饱和重塑黄土的屈服应力（ps，qs）。

Experimental study on strength and yield properties of unsaturated disturbed loess

To study the strength and yield properties of unsaturated disturbed loess, a series of triaxial shear tests of loess were done on the condition of suction control. Study the stress-strain curves, the strength and yield properties of disturbed loess. The test results show that the failure model of disturbed loess is shown with plastic failure;the stress-strain curves of disturbed loess will change from strain softening to strain hardening with different confining pressure under same suction;the strength envelope of disturbed loess is distributed with linear in the plane of p - q ; the cohesion of disturbed loess has a linear increase with the increase of suction, but the friction angle is found to have little change with the change of suction. The curves of εr-log（q/p） of loess has three-stage with different suction, and the yield stress（ps ,qs） of unsaturated disturbed loess was acquired.