基于碾振性态的土石坝料压实质量监测指标分析与改进

通过土石坝坝料碾压试验，分析了碾轮振动性态——振动加速度时域和频域的变化，得到了加速度幅值和加速度畸变程度随坝料压实程度及碾压机振动频率的变化规律。在此基础上，指出了现有基于加速度时域分析的地基反力指标（Fs）和基于频域分析的压实监测值（CV）用于表征土石坝坝料压实度的弊端，提出了考虑滞后相位角的改进地基反力指标，以及耦合考虑振动频率和加速度谐波畸变程度的压实监测指标。实例分析结果表明：改进的两个压实监测指标与碾压遍数、压实度的相关性更好，用于表征土石坝料压实度的误差更小，本研究可为土石坝施工质量的实时控制提供新的控制指标。

Analysis and improvement of roller vibration behavior-based indexes for monitoring compaction quality of earth-rock dams

This study conducts rolling compaction tests of earth-rock dam material and examines roller vibration behaviors ? acceleration in time and frequency domains, and obtains the law of the amplitude and distortion degree of the roller acceleration varying with compaction degree and roller vibration frequency. On this basis, we find the disadvantages of the existing indexes for characterizing compaction quality, including ground reaction force index (Fs) and compaction value (CV) which are based on acceleration time and frequency domain analysis respectively. An improved ground reaction force index for consideration of lag phase angle and a compaction monitor index for the combined effect of roller vibration frequency and acceleration harmonics are then put forward in this paper. Application in case studies shows that these two improved indexes for compaction monitoring are better in correlation with rolling passes and material compactness, helping reduce the errors in characterization of the compactness of earth-rock dam materials. Thus the improved indexes would provide a new way of real-time monitoring on earth-rock dam construction quality.