摘要
为研究中主应力对冻结黏土力学特性的影响,借助冻土真三轴仪,开展了一系列真三轴压缩试验。试验结果表明:冻结黏土的强度和变形模量呈正相关,随着中主应力的增加,二者均呈现出先升高后降低的变化趋势;中主应力对冻结黏土的侧向变形产生显著的影响,且中主应力方向和小主应力方向之间的变形差异随着中主应力的增加而增加;在不同中主应力条件下,冻结黏土的应力应变曲线均呈现出应变硬化的特性,邓肯-张模型能够准确的反映出其在复杂应力状态下的强度和变形特性。
In order to study the intermediate principal stress effected to the mechanical characteristics of the freezing clay,with the true triaxial apparatus of the freezing soil,a series of the true triaxial compression tests were conducted.The test results showed the strength and deformation modulus of the freezing clay were in a positive correlation and with the intermediate principal stress increased,the strength and deformation modulus both would have a first increasing and late decreasing variation tendency.The intermediate principal stress would have a remarkable influence to cause the lateral deformation of the freezing clay and the deformation difference between the intermediate principal stress direction and the minor principal stress direction would be increased with the intermediate principal stress increased.Under the condition of the different intermediate principal stress,the stress and strain curves of the freezing clay all would have the strain hardening characteristics and the Duncan-Chang model could accurately reflect the strength and deformation characteristics under the complicated stress states.
作者
祝林立
马芹永
ZHU Linli;MA Qinyong(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China)
出处
《建井技术》
2022年第4期60-65,共6页
Mine Construction Technology
基金
国家自然科学基金项目(50874003)。
关键词
中主应力
冻结黏土
真三轴试验
强度特性
变形模量
intermediate principal stress
freezing clay
true triaxial test
strength characteristics
deformation modulus
