Control standards for compaction parameters of earth-rock dams under continuous construction process monitoring

In order to meet the needs of compaction parameter control for construction of earth-rock dams under continuous process monitoring, the sustained over-speed duration time of roller velocity, continued non-qualification duration time of vibration status, compacted thickness and qualification rate of compaction pass are employed as the control indices of compaction quality of the entire working area. According to the correlation between the compactness of core wall materials and each of compaction parameters (e.g., compaction pass, compacted thickness, and gradation of materials moisture content), a multiple regression model is established. Furthermore, a Monte-Carlo simulation-based method is presented to determine the control standards for the qualification rate of compaction pass which meets the corresponding compaction quality control standards required in the current codes. The case study demonstrates that the compaction quality of all sampling pits in the core wall zone satisfies the design requirements according to the proposed control standards. It may provide an effective approach for compaction quality control of earth-rock dams under continuous construction process monitoring.