人民长江2024，Vol.55Issue(4)：32-37,6.DOI:10.16232/j.cnki.1001-4179.2024.04.005
红石岩堰塞坝新堆积体动三轴试验研究
Dynamic triaxial experimental study on new deposit body of Hongshiyan barrier dam
摘要
Abstract
The new deposit body of Hongshiyan barrier dam is mainly composed of limestone and dolomite,and the gradation and density are very discrete.Meanwhile,results show that the new deposit body has the properties of viscous coarse-grained soil,and the static parameters show obvious dispersion,so it is necessary to study its dynamic properties to provide material data for transforming the barrier dam to a hydraulic project.In this paper,the dynamic shear modulus and damping ratio tests of the new accumulation were carried out by using the GDS dynamic triaxial instrument to study the dynamic stress-strain characteris-tics and its influencing factors.The test results showed that the dynamic shear modulus of the new deposit body decreased and the damping ratio increased with the increasing of shear strain.The dynamic characteristics of the new deposit were obviously affected by the confining pressure.The maximum dynamic shear modulus increased with the augment of confining pressure.Under the same shear strain,with the increase of the confining pressure,the dry density,the coarse particle content respectively,the dynamic shear modulus ratio all increased and the damping ratio all decreased.However,the new deposit body had more fine grain content,com-plex grain lithology and showed obvious difference in weathering degree,so it led to discrete dynamic characteristics that is obvi-ously different from the artificial dam rockfill material.关键词
新堆积体/颗粒级配/密度/动剪切模量/阻尼比/动三轴试验/红石岩堰塞坝Key words
new deposit/grain composition/density/dynamic shear modulus/damping ratio/dynamic triaxial test/Hong-shiyan barrier dam分类
水利科学引用本文复制引用
贾宇峰,许米格,相彪..红石岩堰塞坝新堆积体动三轴试验研究[J].人民长江,2024,55(4):32-37,6.基金项目
国家自然科学基金面上项目(52379116) （52379116）
