| Water falling dam depends on slurry processed through high-pressure hydraulic giantflushing and hand stirring the soil which has been placed on high position then transport themto the internal part of the dam body, when the slurry is dehydrated and consolidated, the damis finished. The water falling dam has been well developed because it’s relatively lowinvestment and efficiency. But this kind of dam also has its own shortcomings such as thedifficulties for dehydrate and consolidate of the slurry, restrict on construction areas. In orderto cope with these problems, we proposed mud pump dam.Constructing a dam with mud pump will need water and soil in a specific volumetricratio and then stirred to slurry, after that, transport the slurry with a pipeline to the surface ofthe dam, when the slurry is dehydrated and consolidated, the dam is finished. It’s a newtechnic based on water falling dam. Now all the theoretical researches and practicalapplications of mud pump dam are in experimental stage, the experience of both theory andpractice are not complete yet.This paper pays attention on the monitoring of the dam construction process inQianguaigou, applied soil mechanics, dam field monitoring, related standards of water fallingdam and so forth to monitor the construction process of mud pump dam. The experimentaldata were processed and analyzed through SAS and Excel software. The results of this paperwill provide a theoretical guideline to insure the safety during dam construction and pave theway for the improvement of mud pump dam technic and its further research and spread.The main results of this paper:（1）The inspection of dam construction quality and the election of better machines fordam construction.①The average slurry flow of4thgeneration mud pump was65.82m3/h, the averagesoil/water ratio of the slurry was1.43, the amount and density of the slurry were both stable.The operation of the4thgeneration mud pump was better than2ndand3rdgeneration, and wasable to conduct continuous dam construction experiment, so that its quality and efficiency could be measured to determine if these parameters could fulfil the standard in practical damconstruction.②The maximum dry bulk density of upstream of the dam ridge was1.80g/cm3whilethe minimum was1.57g/cm3, the average was1.67g/cm3; The maximum dry bulk densityof downstream of the dam ridge was1.66g/cm3while the minimum was1.52g/cm3, theaverage was1.57g/cm3. All the dry bulk densities were greater than the standards so theridge bulk density satisfied the demand, the construction was safe.③The drainage of all the drainage pipe inside the dam body was123.52m3, accountedfor16.67%of total drainage, the efficiency was good enough.（2）The monitoring of dam deformation: during the construction, the maximumhorizontal and vertical shift was less than15mm, the accumulated shifts in two days was lessthan30mm, met the standards, the dam was safe and stable. No cracks which could threat thedam occurred during the construction.（3）The monitoring of dam stress: The soil pressure gauge of the dam worked well, soilpressure was accord with the real situation. Slurry shear strength and water content had astrict regression relationship, the fitting function was y=44432e-0.279x, while R2=0.9561. Themain water drainage stage of the slurry was the first20hours. In practical dam construction,increasing the soil/water ratio of the slurry will benefit the project: propel the process andconsume less time for dehydration and consolidation. |
