ANALISA PERBANDINGAN PELAKSANAAN SECANT PILE DENGAN DIAPHRAGM WALL SEBAGAI PERBAIKAN PONDASI BENDUNGAN SEMANTOK

The Package I Semantok Dam Contruction Project is a project belonging to the Balai Besar Wilayah Sungai (BBWS) Brantas. In a dam to prevent seepage of water on the dam foundation, it is necessary to repair the foundation. The Semantok Dam uses the Secant Pile as a foundation repair. On the other side, there is another foundation dam repair, namely Diaphragm Wall which also has the same function as the Secant Pile. This Comparative Analysis of Secant Pile with Diaphragm Wall aims to compare the most efficient method with the required HSE, Time and Cost parameters. The data needed in the preparation of the Comparative Analysis are drawings of the Secant Pile and Diaphragm Wall work plans, technical specifications for foundation repair, and the unit price of the Nganjuk Regency work in 2021. The preparation of risk analysis in HSE uses HIRARC, the work schedule using Microsoft Project 2016 program and cost plan using Microsoft Excel 2019 program. The result of this comparative analysis is that Diaphragm Wall is more efficient in terms of implementation method, HSE, time, and also cost than Secant Pile. In the Secant Pile there are 43 accident risks, with a total processing time of 301 days, and the required cost is Rp. 198,009,706,092.05,. On the Diaphragm Wall there are 41 accident risks, with a total processing time of 74 days, and the required cost is Rp. 149,974,022,220.27,.