不同VC值下基于压实功的RCC碾压参数控制标准确定方法  

Compaction energy-based determination method for control standards of RCC compaction parameters under different vibrating-compacted values

作　　者：刘东海[1] 孙龙飞[1] 夏谢天 LIU Donghai;SUN Longfei;XIA Xietian(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室

出　　处：《水利学报》2019年第9期1063-1071,共9页Journal of Hydraulic Engineering

基　　金：国家自然科学基金创新群体研究项目(51621092);国家自然科学基金项目(51679164)

摘　　要：碾压混凝土(RCC)的压实质量主要由VC值及各施工碾压参数(碾压机静压力、激振力、行驶速度、碾压遍数等)控制。若对单个碾压参数分别加以控制,不但会增加控制难度,而且由于现场施工情况的多变性,不易保证压实质量。本文基于压实功这一综合反映施工碾压参数的指标,利用自主研制的多参数可调式RCC碾压模拟试验装置,开展了不同VC值下RCC碾压试验,分别建立了考虑VC值的改进单位体积压实功与RCC本体压实密度、改进单位面积压实功与层面抗剪强度比的关系模型,进而提出了基于压实功的不同VC值下碾压参数控制标准的确定方法。结果表明:所建立的关系模型相关性良好,利用提出方法确定的碾压遍数标准与实际施工基本一致,从而可为应对现场VC值变化情况下的RCC碾压参数的动态调整提供依据和途径。The compaction quality of roller-compacted concrete(RCC) is mainly controlled by vibratingcompacted(VC) value and compaction parameters(roller static load,excitation force,roller velocity,compaction passes,etc.). If the individual compaction parameter is controlled separately,it will not only increase the difficulty of construction control but also not guarantee compaction quality easily,due to the variability of the in situ construction conditions. In this study,basing on the compaction energy,which reflects the comprehensive effect of compaction parameters,the self-developed multi-parameter adjustable laboratory device for simulating RCC compaction was used to carry out the RCC compaction tests under different VC values. The relationship models between the improved compaction energy per unit volume considering VC value and the compaction density of RCC matrix,as well as the improved compaction energy per unit area considering VC value and the shear strength ratio of RCC interface,were established respectively. Basing on the established models,the compaction energy-based determination method for control standards of compaction parameters under different VC values was proposed. The results show that the correlation of relationship models established is good,and the determined control standards of compaction passes using the proposed method are consistent with the actual construction. The proposed method provides a basis and way for dynamic adjustment of RCC compaction parameters in response to the change of in situ VC values.

关 键 词：碾压混凝土 VC值 压实功 碾压参数 控制标准 

分 类 号：TV642.2[水利工程—水利水电工程]