摘要
以Fredlund双应力状态参量理论为基础,采用经过改进的非饱和土直剪仪,对4组原状非饱和黄土进行控制基质吸力和净竖向压力为常数的固结排水直剪试验。本试验可直接得出净竖向压力以及基质吸力对原状非饱和黄土抗剪强度的影响,无需采用测量水土特征曲线的方法来间接求得抗剪强度,从而简化了非饱和土强度试验的过程。通过试验可以得出,不同基质吸力条件下原状非饱和黄土的抗剪强度特征以及相应的关系曲线,并提出了相关的抗剪强度公式,得出了有关参数。
On the basis of Fredlund double stress state variable theory, the consolidation drain shear tests with controlling suction for undisturbed unsaturated loess are carried out by using direct shear apparatus. From the tests the influence of the net vertical pressure and matrix suction on the shear strength of the loess could be obtained directly, which doesn＇t need to measure the soil-water characteristic curve for the shear strength, and the testing process for the strength is simplified. Through the said tests the shear strength character of the loess and the relevant relation curves under the mula and the parameters for the shear conditions of different matrix suctions could be obtained. The relevant forstrength are put forward.
出处
《工程勘察》
CSCD
北大核心
2006年第8期6-9,19,共5页
Geotechnical Investigation & Surveying
基金
国家自然科学基金资助项目(50379043)
中国科学院武汉岩土力学研究所岩土力学重点实验室基金项目(Z110302)
关键词
原状非饱和黄土
基质吸力
抗剪强度
undisturbed unsaturated loess
matrix suction
shear strength
