Abstract

Abstract In the implementation of the construction of the Tiu Suntuk Dam, there are several design adjustments made including changes to the location of the embankment material collection which previously came from outside the inundation area to inside the inundation area, in addition there are also design adjustments to the upstream slope slope which was originally based on a slope design of 1: 2.5 optimized to a slope of 1: 2.0. The design changes are due to adjustments to conditions during implementation through surveys and field engineering to produce more effective and efficient construction. Based on this, it is necessary to make technical justifications related to dam safety with real data used during construction. From the results of the stability analysis, it was obtained that the slope stability of the Tiu Suntuk Dam is safe from normal loads and earthquake loads both in normal water level conditions, flood water levels and fast-receding reservoir conditions. The critical safety number occurs in the OBE earthquake load condition in rapid drawdown condition on the upstream slope with an Safety Factor (SF) value of 1.20 > the permissible SF of 1.10. While in the MDE earthquake load condition the slope stability is not safe with an SF value of 0.15 < the permissible SF of 1.00. However, after controlling the deformation using the Makdisi-seed method, it was discovered that the maximum deformation due to the MDE earthquake load on the upstream slope was 1.18 m, this condition was still smaller than half the existing retaining height of 2.25 m so that if an MDE earthquake load occurred, the dam would experience damage but would not collapse.

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