岩土力学2017，Vol.38Issue(11)：3205-3214,10.DOI:10.16285/j.rsm.2017.11.016
压实度和基质吸力对土石混合填料强度变形特性的影响研究
Research on effects of compactness and matric suction on strength deformation characteristics of soil-rock aggregate mixture
摘要
Abstract
By using triaxial apparatus,36 consolidated drained tests were conducted on the unsaturated soil to determine the parameters and the model of the high-fill soil-rock mixture project.The effects of compaction degree,magic suction and mixing ratio on the strength and deformation characteristics of the unsaturated remoulded mixture were quantitatively examined by controlling net confining pressure.Modified expressions for shear strength,tangent deformation modulus and tangent volume modulus of unsaturated compacted soil were also developed.The experimental results showed that the failure stress and cohesion increased linearly with the increase of suction,whereas the changes of suction had little influence on the effective internal friction angle.It was found that failure stress and strength parameters increased with the increase of compaction coefficient.The failure stress and strength parameters of soil samples with the ratio of 4∶6 were slightly higher than those of soil samples with the ratio of 2∶ 8.Moreover,the effective cohesion increased with the increase of silty clay content.For the same mixing proportion and compacting coefficient of soil samples,the intensity of sample grew with the increase of net confining pressure and suction.Correspondingly,its volume gradually changed from shrinkage to dilatancy.For the same net confining pressure,the suction and the mixture ratio of soil samples,the strain curve progressively turned from the strain hardening type to the ideal elastoplastic type with the increase of compaction coefficient.However,partial soil samples tended to strain softening type under the low net confining pressure.It is verified that the revised incremental nonlinear constitutive relationship of unsaturated soil is consistent with the practical project of large area fill.Thus,this study can be used for calculating the deformation of high-fill foundation and analysing the stability of the high embankment slope.关键词
土石混合料/抗剪强度/非线性模型参数/压实度/基质吸力Key words
soil-rock aggregate mixture/shear strength/nonlinear model parameters/compactness/matric suction分类
建筑与水利引用本文复制引用
杨校辉,朱彦鹏,郭楠,师占宾,冉国良..压实度和基质吸力对土石混合填料强度变形特性的影响研究[J].岩土力学,2017,38(11):3205-3214,10.基金项目
甘肃省科技重大专项计划项目(No.1302FKDA030) （No.1302FKDA030）
教育部长江学者创新团队支持计划项目(No.IRT13068,No.IRT_17R51).This work was supported by the Major Project of Science and Technology Plan Projects of Gansu Province (1302FKDA030) and the Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (IRT13068,IRT_17R51). （No.IRT13068,No.IRT_17R51）
