Database for Quality Control in the Embankment Dam Cutoff Wall Construction

Abstract

The cutoff wall construction project for the embankment dam begins with trench excavation using Hydraulic Grab and Hydromill before backfilling with plastic concrete. Quality testing, including material properties and cutoff wall performance, is conducted to ensure compliance with technical specifications. The large volume of test data, up to 60,000 records, necessitates a database system for efficient management, processing, and summarization, facilitating data utilization during construction and long-term dam behavior studies. The database development process starts with workflow diagram and quality checkpoints to define recordable data. Contractor-provided test data is recorded and processed using Excel macros to display results by excavation panel or checkpoint. This system aids work acceptance by comparing data against technical criteria and enables statistical analysis of construction-phase testing data. Analysis reveals bentonite slurry viscosity ranges from 34-36 seconds, plastic concrete slump ranges from 20-22 cm, and the difference ratio between lab and field cutoff wall quality tests is 1:0.52 to 1:1.51 for permeability and 1:0.965 to 1:1.023 for unit weight. This data supports quality control, progress reporting, and dam behavior observation for construction safety assessment.