In large dams, the reservoir water level will become a large hydrostatic pressure and reduce the effective stress due to the effect of seepage on the dam body. The total stress that occurs can cause deformation in the dam body to exceed the allowable deformation. Therefore, it is necessary to evaluate the deformation of the dam to know the stability of the dam. This research aimed to analyze the deformation of the dam in a steady-state seepage condition. The reservoir water level was modeled on minimum, normal, and flooded water levels. The deformation was analyzed using the three-dimension finite element method. Deformation analysis results show that the deformation increased when the reservoir water level increased. Significant deformation increase occurred in x-direction deformation i.e. 0.27 m at minimum water level, 0.55 m at normal water level and 0.55 m at flooded water level. The deformation obtained from the analysis still required the maximum deformation criteria of 2 m, which is half of the freeboard.

The Jatigede Dam is a multi-purpose rockfill dam located in Sumedang Regency,West Java Province. The construction of the Jatigede Dam started in 2008 and it isthe second largest dam in Indonesia after the Jatiluhur Dam. As one of the vital facilities, it is highly necessary to evaluate the stability of the Jatigede Dam to avoid dam collapse. First reservoir filling is one of the factors affecting the dam stability; therefore, this research aims to evaluate the Jatigede Dam stability during impounding. The transient seepage analysis was conducted to evaluate the pore pressure change during impounding. The result of seepage analysis was used to analyze the dam stability using the limit equilibrium method with Rockscience software of Slide2. The results of the seepage analysis shows that the rise of the reservoir water level affects the upstream slope stability. The safety factor of the upstream slope changes during the impounding process. All thesafety factors for the upstream and downstream slopes during impounding still meet theminimum safety factor criteria required.

The availability of mountain rock materials in East Kolaka Regency, Ladongi Subdistrict, Lalowosula Village, is quite numerous and has a wide spread. But unfortunately the material has not been used properly and optimally, therefore the use of the material is only taken in certain places until the material reserves are exhausted at any time. On the other hand, in some places in East Kolaka, Ladongi Subdistrict, Lalowosula Village, there is still material with sufficient availability and has never been used as layer of road pavement. From the result of research in the exixting testing, the feasibility of broken stone material from Lalowosula Village Ladongi District East Kolaka District is eligible to be used and meets the General Specification of Bina Marga 2018 (Division 5) which with testing data: Compaction value with dry content weight = 2,231 gr/cm3 and water concent of 3.97%, CBR = 95.5% Abration = 20.76% Plastict Index = 0%, Liquid Limit = 0%. And can be used as a layered material foundation pavement Class A.Ketersediaan material batu gunung di Kabupaten Kolaka Timur, Kecamatan Ladongi, Desa Lalowosula, terbilang banyak dan memiliki penyebaran yang begitu luas. Namun sayanganya material tersebut belum digunakan secara baik dan optimal, oleh karena itu pengguna material tersebut hanya diambil pada beberapa tempat tertentu saja hingga cadangan materialpun suatu saat habis. Di Lalowosula, masih terdapat material dengan ketersediaan cukup dan belum pernah digunakan sebagai bahan lapis pondasi pekerasan jalan.Dari hasil penelitian di laboratorium bahwa berdasarkan pengujian yang ad,a, kelayakan dari material batu pecah asal Desa Lalowosula Kecamatan Ladongi Kabupaten Kolaka Timur layak digunakan dan memenuhi Spesifikasi Umum Bina Marga 2018 (Divisi 5) yang mana dengan data pengujian:Nilai pemadatan dengan berat isi kering = 2,231 gr/cm3 dan kadar air 3,97%, CBR95,5%, Abrasi = 20,76% Indeks Plastis = 0%, dan Batas Cair = 0 %. Serta dapat digunakan sebagai bahan lapis pondasi perkerasan kelas A.

Soil investigation plays an important role in construction design. Adequate information regarding soil types and parameters are needed for a safe and economical foundation. However, limited budget often leads to inadequate soil investigations, and as a result, unknown soil parameters are estimated through correlations from the limited investigations that have been carried out. Correlations from SPT and CPT results are often used for design, but their applicability from location to location is questionable. This paper discusses the correlation of N-SPT values to CPT values in Wolo District, Kolaka Regency. The correlation was performed using linear regression analysis to obtain relationships between N-SPT and CPT. The three correlations obtained are N-SPT = 5.64 + 0.012qc, R2 value of 0.082; N-SPT = 5.93 + 0.01 qc – 0.095qf, R2 value of 0.125; N-SPT = 0.025qc + 0.341qf, R2 value of 0.455.

Selain daya dukung aksial, tiang pancang dermaga perlu untuk dianalisis tahanan lateralnya sebab tiang pancang menerima beban horizontal yang cukup besar. Perhitungan pembebanan dermaga dianalisis menggunakan program SAP 2000. Daya dukung fondasi tiang pancang dihitung menggunakan metode Mayerhof berdasarkan data hasil uji penetrasi standar (SPT) dan perhitungan defleksi tiang menggunakan metode Broms. Hasil analisis menunjukkan nilai daya dukung ultimate tiang sebesar 3974.93 kN dangan SF 4.98 dan tiang berdefleksi sebesar 0.110 mm. Jika tiang diperpendek, maka daya dukung ultimate tiang menjadi 2575.713 kN dengan SF 4.04 dan tiang berdefleksi sebesar 0.0150 mm. Hasil analisis menunjukkan nilai daya dukung ultimate tiang masih memenuhi kriteria keamanan yang dipersyaratkan.