摘要
通过等吸力三轴试验研究非饱和黄土在控制吸力条件下的应力应变特性,推导了新的吸附强度公式,该公式可预测吸力对非饱和黄土抗剪强度的贡献,并设定工程案例对吸力影响下的非饱和黄土边坡进行了稳定性分析.结果表明:强度参数c随吸力增大而增大,而强度参数φ随吸力的增大基本上不变;在围压一定时,原状黄土的抗剪强度随吸力的增大而增大且应力应变曲线多为硬化型曲线,吸附强度随吸力的增大而增大且呈二次函数关系,边坡安全系数随吸力的增大而增大且呈对数函数关系.
The stress-strain characteristics of unsaturated loess is studied by suction three axis test under the condition of controlled suction. The new adsorption strength formula is derived,which can predict the contribution of suction to the shear strength of unsaturated loess. The stability analysis of the unsaturated loess slope under the influence of suction is set up by the engineering case. The test results show:The strength parameters of c increases with the increase of the suction force,and the strength parameters of φ basically unchanges with the increase of the suction force. Then the confining pressure is certain,the shear strength of undisturbed loess increases with the increase of suction force,and the stress and strain curves show hardening type. The adsorption strength increases with the increase of suction force,but there is an extreme value. The safety factor of the slope increases with the increase of the suction force,and has a logarithmic function relationship
作者
庞旭卿
Pang Xuqing(Railway Engineering Department,Shaanxi Railway Institute,Weinan 714000,Shaanxi China)
出处
《河南科学》
2017年第1期116-120,共5页
Henan Science
基金
陕西省教育厅专项科研计划项目(16JK1171)
关键词
控制吸力
非饱和黄土
吸附强度
均质边坡
controlled suction
unsaturated loess
suction strength
homogeneous slope
