摘要
采用ZFY-1A型非饱和土应变控制式直剪仪,对非饱和高液限黏土-土工织物界面进行控制吸力的剪切试验,探讨基质吸力对筋土界面剪切特性的影响.研究结果表明,非饱和高液限黏土-土工织物界面的抗剪强度随着净法向应力、基质吸力的增大而不断提高,剪切位移-剪应力曲线表现出轻微的应变硬化软化特性.剪切过程中有水从试样中排出,净法向应力越大,含水量变化量Δwmax越大,基质吸力越大Δwmax反而越小.界面剪胀角随着基质吸力的增加而增大,随着净法向应力的增加而减小.界面强度随着平均界面剪胀角的增加而增大.最后确定了不同吸力值下的界面强度参数及强度公式.
A series of direct shear tests were performed using ZFY - 1 △ direct shear apparatus to in- vestigate the shearing resistance properties of high liquid limit clay - geotextile interface. Results of the study indicate that the peak shear strength of the soil - geotextile interface increases with the suction and net normal stress, curves of the shear stress and horizontal displacement show hardening - soften- ing behavior. Small decreases in water content were detected during shearing of the soil - geotextile in- terface shear tests, the higher the net stress, the larger the △W(max), but the higher suction, the smal- ler the △w(max). The interface dilation angle increases with matric suction and decreases with net nor- mal stress. The larger the average interface dilation angle, the higher the shear strength. Finally, we determine the interface parameters and interface strength formula in different sunction conditions.
出处
《福州大学学报(自然科学版)》
CAS
CSCD
北大核心
2014年第4期606-614,共9页
Journal of Fuzhou University(Natural Science Edition)
基金
福建省新世纪人才支持计划资助项目(XSJRC2007-15)
关键词
高液限黏土
基质吸力
土工织物
直剪试验
high liquid limit clay
matrix suction
geotextiles
direct shear test