摘要
通过碾压试验,寻求最佳的碾压参数组合是确保碾压混凝土(RCC)坝压实质量的关键。常规在大坝施工前开展RCC碾压试验成本高、费时间。本文提出基于压实能力的模拟相似原理,研制了多参数可调式RCC碾压模拟试验装置。该装置不但可克服小型碾压试验的碾轮缩尺效应,以及振动压实成型试验平板振动方式与实际碾轮滚动振碾差异较大的弊端,而且可实现碾压机静压力、激振力(振动频率和振幅)、行驶速度、碾压遍数等多级可调。模拟试验结果表明:该装置可等效模拟实际碾压机工作状态;碾压的试件密度和强度能够达到标准试件的密度和强度,含层面试件的抗剪强度也能满足实际施工的要求。本装置可为研究不同碾压参数对RCC坝料压实质量的影响规律,进而优化碾压参数提供了一条经济、便捷、准确、有效的技术途径。
To find optimal combination of compaction parameters through compaction tests is the key to ensure compaction quality of a roller-compacted concrete(RCC) dam. The conventional tests conducted before dam construction are costly and time consuming. This paper describes a similarity principle for RCC compaction simulations based on compaction capability, and presents a multi-parameter adjustable laboratory device for the simulations. The device can not only overcome the scale effect of small test rollers, and the shortcoming in the plate vibration used in vibration compaction forming tests that is greatly different from on-site roller vibration compaction, but make the parameters adjustable in multiple stages, such as roller static load, excitation force(vibration frequency and amplitude), roller velocity, and compaction passes. Simulation experiments show that the device can equivalently simulate the working conditions of a roller compactor on site;compacted samples reach the same density and strength as those of standard specimens, and the interface shear strength of the samples meet the requirements of on-site construction. It provides an economical, convenient, accurate, and effective technology to study the influence of compaction parameters on the compaction quality of RCC dam materials and then to optimize the parameters.
作者
刘东海
孙龙飞
夏谢天
LIU Donghai;SUN Longfei;XIA Xietian(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300350)
出处
《水力发电学报》
EI
CSCD
北大核心
2019年第11期112-120,共9页
Journal of Hydroelectric Engineering
基金
国家自然科学基金(51679164)
国家自然科学基金创新群体研究项目(51621092)
关键词
碾压混凝土坝
压实质量
碾压参数
模拟装置
压实能力
模拟相似律
roller-compacted concrete dam
compaction quality
compaction parameters
simulation device
compaction capability
similarity principle
