| Summary: | 碩士 === 國立屏東科技大學 === 土木工程系所 === 102 === In recent years, due to climate change, heavy rainstorms break out occasionally. Rivers in Taiwan appear sand-rich and high flow. According to the statistics from Water Resources Agency, among various causes of damage to flood-protection projects, deterioration of levee revetments accounts for approximately 7.9%. During strong typhoons and heavy rains, the river levels, rising up abruptly and bring sands and gravels, scour and impact directly on the weakness of deteriorating concrete revetment and then causes damage to the levee revetment, affecting and threatening lives and properties. Thus, focusing on the deterioration of concrete levee revetments, providing simple and credible assessment on safety inspection, is worthy of further research and exploration.
In this study, we utilized methods of unmanned aerial vehicles, rebound hammer test and DERU visual assessment criteria, etc to study the detection of deterioration of levee revetments. Using unmanned aerial vehicle to take photographs at 30 meters high, we measured the damaged area and length and other dimensions in the images, and compared with the visual measurements of the construction scene. For the comparison,the error is approximately below 6%. Strength of the deteriorating concrete was measured by the rebound hammer test and core testing. The error is less than approximately 16.41% . This provides a simple and economical method to analyze the deteriorating levee revetments. And from the difference (Ci value) between DERU visual assessment criteria and visual measurement on the construction scene, we confirmed that this method is able to verify the actual deteriorating conditions of concrete levee revetments. This research results are valuable references for the safety inspection of flood-prevention construction structures domestically.
|
|---|
