Real-time Exciting Force Monitoring And Vibration Compaction Quality Assessment Of Liyang Pumped-storage Power Station Rock-fill Dam

The effective construction quality control is critical to ensure long-term safety and stability of Liyang Pumped-storage Power Station(LPPS) rock-fill dam. The compaction parameters(e.g., roller speed, exciting force, compaction passes and lift thickness) are important factors which affect dam compaction quality during compacting process. The conventional methods of compaction quality control for rock-fill dam are to control compaction parameters by site supervision and test pit sampling after compaction. However, it has man-made interference, and it is difficult to truly reflect the compaction quality of the whole work area for using limited samples. Basing on the previous researches, further study on the real-time exciting force monitoring system for LPPS rock-fill dam was made to realize the exciting force monitoring. Meanwhile, in order to overcome the shortages of using limited samples and time consuming of pits test, the vibration compaction quality assessment method of LPPS rock-fill dam was presented to realize the rapid quality evaluation. The main contents and achievements of this thesis are as follows:(1) The real-time exciting force monitoring system for LPPS rock-fill dam was developed. The general framework and main functions of this system were designed to realize the exciting force monitoring and unsatisfication alarming. The system was applied to the LPPS project, which provides a new technological tool to directly control the exciting force and ensure the rollers' exciting performance.(2) Employing the real-time vibration compaction quality monitoring system for LPPS rock-fill dam which was developed previously, the compaction value(CV) can be acquired timely during rolling process. Then a Back Propagation(BP) neural network model for the LPPS rock-fill dam vibration compaction quality evaluation was established. Using the spatial interpolation method, the dry density at any position and the passing rate of compaction quality of the entire work unit can be achieved. Thus it realized rapid assessment of compaction quality on the work unit and overcame the shortages of using limited samples, which provides strong references to improve the quality of LPPS rock-fill dam.