Abstract
Kedung Uling earthfill dam locates at Wonogiri Regency, Central Java, Indonesia. The dam encountered sliding and settlement at the embankment wall. To minimize sliding and settlement and to optimize the dam, both field investigation and laboratory tests have been proceeded for slope stability analysis and remedial embankment wall. Soil and rock investigation around the dam, which is followed by 10 core drillings, have been conducted. Laboratory tests such as direct shear and index properties have also been carried on. The results were further used for dam slope stability model using slide 6.0 and were used to analyzed factor of safety (FS) of Kedunguling dam. 10 conditions of dam were simulated and strengthening body of dam with grouting was designed. The results showed two conditions, which are condition of maximum water level with and without earthquake at downstream, were unsatisfy Indonesia National Standard (SNI) for building and infrastructure. These conditions can be managed by using grouting for increasing stabilization of embankment wall. By setting up grouting, factor of safety increases and meet the SNI standard requirement.
Highlights
Kedung Uling earthfill dam is one of many old earthfill dams in Indonesia
The results of tests will be used for slope stability analysis at the embankment wall of dam and for grouting design
Before slope stability of dam is simulated, analytical of earthquake in Kedung Uling is determined based on Indonesia earthquake zonation map
Summary
Kedung Uling earthfill dam is one of many old earthfill dams in Indonesia. The dam which was established on 1917, locates at Wonogiri Regency, Central Java, Indonesia. Kedung Uling dam which has main function for irigation has 479.000 m3 capacity and distributing irigation for 596 hectare rice fields. Other functions of this dam are for tourism and fishery fresh water. In 2013 to 2014, the dam was encountered sliding and settlement at the embankment wall These such problems affect function of dam such as releasing water in big quantity, disturbance risk people or infrastructures at the downstream [1].It is strongly required to analyze the slope stability of Kedung Uling dam for overcoming the problems. In the implementation in earthfill dam, it is expected that strengthening of soil after grouting is not changing the materials to be concrete so that the soil can move plastically when the water flooding the dam
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