The Study of Slope Stability of Irrigation Canal : A Case Study of the Tha Hua Lob Floodgate Project, Wangkrai Sub-district, Tha Yang District, Phetchaburi Province, Thailand.

Abstract

The rainy season in Thailand results in elevated water   levels in irrigation canals, which subsequently decrease rapidly due to inadequate management of floodgates. This fluctuation can lead to the collapse of canal slopes and undermine soil stability. This research focuses on analyzing the slope stability of irrigation canal slopes, with particular emphasis on the Tha Hua Lob Floodgate Project located in Wangkrai Sub-district,  Tha Yang District, Phetchaburi Province. The primary objective  is to evaluate the safety factor during these rapid changes in water levels, utilizing the GeoStudio2023 model, in order to establish guidelines for the design of safer canal slopes. The findings indicate that the safety factor remains satisfactory across various scenarios, including the conditions of highest water level, lowest water level, rapid drawdown, end of construction, and seismic events.