堆石料制样方法对其强度和变形特性影响-《郑州大学学报(工学版)》

文章信息/Info

Title:: Effects of Sample Preparation Method on Rockfill’s Strengthand Deformation Behaviors

作者:: 傅华; 凌华; 张亚丽; 等.; 南京水利科学研究院岩土工程研究所,江苏,南京,210029, 中国水电顾问集团北京勘测设计研究院,北京,100024

Author(s):: FU Hua; LING Hua; ZHANG Yali; etc;; 1. Geotechnical Engineering Deparment, Nanjing Hydraulie Research Institute, Nanjing 210029, China;2. Hydrochina BeijingEnginecring Corporation,Beijing 100024 ,China

Keywords:: rockfill; sample preparation method ; maximum dry density; strength and deformation behavior

摘要:: 进行了堆石料的表面振动器压实法和振动台法制样比较试验,结果表明,表面振动器压实法所得出的试样最大干密度值明显高于振动台法.同时,针对这两种制样方法所得出的试样,开展了大型三轴得出制样方法对堆石料的强度和变形指标具有明显影响,表面振动器法对应试样的强度和变形指标均优于振动台法,其中对变形特性指标的影响更为显著.考虑到表面振动器制样过程与土石坝实际施工碾压过程近乎一致,因此,建议将表面振动器压实法作为堆石料室内最大干密度的测试方法.随着重型碾压设备在土石坝碾压施工中的普遍使用,可通过调整表面振动器底板静压力和延长振动时间来提高振动功率,尽量减小堆石料室内制样密度与现场碾压密度的差异.

Abstract:: Comparative tests of rockfill’s sample preparation method between surface vibration compaction andshaking table declared that the maximum dry density which got by surface vibration is higher than that of shaking table’’s. According to the samples by this two different methods, large triaxial tests was conducted whichdeclared that the sample preparation method has an obvious effect on rockfill’s strength and especially on thedeformation behaviors, the indexes which correspond to surface vibration method is better than that of shakingtable’s. It suggested that surface vibration method should be taken as the method of rockfill’s laboratory max.imum dry density determination by taking the process of sample preparation with surface vibration almost simi.lar with the process of roller compaction during earth-rock dam’s construction into account. With the commonuse of heavy roller equipment in earth-rock dam’s construction, the density difference between laboratory andfield can be reduced by improving the vibration power through adjusting the bottom static pressure and prolon.ging the vibration time.