Page - 882 - in Book of Full Papers - Symposium Hydro Engineering

COMMISSION INTERNATIONALE DES GRANDS BARRAGES ------- VINGT-SIXIÈME CONGRÈS DES GRANDS BARRAGES Autriche, juillet 2018 ------- MAE SUAI DAM SAFETY 1. Mr. Pronmongkol Chidchob, Royal Irrigation Department 2. Mr.Worawut Pintabutr ; Samart Engineering Consultants Co.,Ltd. 3. Mr.Surachai Laikarnchanapaiboon ; Panya Consultants Co.,Ltd. THAILAND 1. INTRODUCTION Mae Suai is the second RCC dam in Thailand which is situated in Chaing Rai province, in the northern region as shown in Figure 1. It was constructed on the Mae Suai river during 1999 and 2002 for irrigation. The storage capacity is 73 Million cubic meter. The dam is a composite dam consisting of the RCC dam in the middle part of the dam to be the spillway and the earth dam on the both abutments because of the foundation condition. View of Mae Suai Dam is shown in Figure 2. The maximum height of dam is about 59 m and the crest length is 400 m. The site plan and section of dam as shown in Figure 3. The foundation of the RCC was excavated to the sound rock. Grouting has been done as necessary. The RCC section uses as an overflow spillway. The RCC section is surrounded with the earth dam. The earth dam extends to both sides of the abutment. Core trench has been excavated in the foundation and to the abutments. There are RCC blocks on the crest of earth dam at the downstream side because of earthfill volume and height of spillway’s downstream wall reduction. 882