不同密度粉质粘土K0固结侧向卸荷三轴试验研究  

Triaxial Test Study on K0 Consolidation of Different Density Silty Clays with Lateral Unloading

作　　者：吴昳 朱俊高[1,2] 黄浩然 褚福永[4] WU Yi;ZHU Jungao;HUANG Haoran;ZHU Fuyong(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing,Jiangsu 210098,China;Reasearch Institute of Geotechnical Engineering,Hohai University,Nanjing,Jiangsu 210098,China;Zhejiang Water Resources and Hydropower Survey and Design Institute,Hangzhou,Zhejiang 310002,China;Engineering College,Lishui University,Lishui,Zhejiang 323000,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学岩土工程科学研究所,江苏南京210098 [3]浙江省水利水电勘测设计院,浙江杭州310002 [4]丽水学院工学院,浙江丽水323000

出　　处：《河北工程大学学报（自然科学版）》2022年第3期49-55,共7页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家自然科学基金面上项目(51479052)。

摘　　要：针对侧向卸荷等特殊应力路径下应力应变关系对土体本构模型的影响,利用应力控制式三轴仪,对南京某工程粉质粘土的重塑样进行了K_(0)固结条件下侧向卸荷三轴固结排水剪试验,研究了侧向卸荷路径下干密度对粉质粘土应力应变及强度特性的影响规律,建立了一个土体因干密度变化引起内摩擦角变化的经验公式,提出了一个侧向卸荷条件下土体破坏时的侧向应变经验公式,并提出了据此公式估计基坑支挡结构的极限位移的方法。Soil deformation has a significant stress path correlation,and the loading along different stress paths will have different stress,strain and strength properties.Understanding the stress-strain relationship under special stress paths such as lateral unloading is of great significance to the in-depth study of soil constitutive models and engineering design of foundation pit excavation.A stress-controlled triaxial apparatus was used to carry out lateral unloading triaxial consolidation drainage shear tests on a remodeled sample of silty clay in a certain engineering in Nanjing under the condition of K_(0) consolidation,and the effect of dry density under the lateral unloading path was studied.The influence laws of the stress,strain and strength characteristics of silty clay are established.An empirical formula for the change of the internal friction angle of the soil due to the change of dry density is established,and an empirical formula for the lateral strain of the soil under the condition of lateral unloading is proposed.A method for estimating the ultimate displacement of the retaining structure of a foundation pit based on the proposed formula is proposed.

关 键 词：粉质粘土 干密度 三轴试验 侧向卸荷 

分 类 号：TU443[建筑科学—岩土工程]