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All Journal Sistem Infrastruktur Teknik Sipil (SIMTEKS) Jurnal Teknik Sipil
Agus Sulaeman
Universitas Sangga Buana
Civil Engineering, Building, Construction & Architecture

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KAJIAN KEKUATAN TANAH KECAMATAN DAYEUHKOLOT DENGAN MENGGUNAKAN DATA INDEX PROPERTIES DAN MECHANICAL PROPERTIES Rully Savitri Nurvita; Agus Sulaeman; Chandra Afriade Siregar
Sistem Infrastruktur Teknik Sipil (SIMTEKS) Vol. 3 No. 1 (2023): SIMTEKS - Maret
Publisher : Program Studi Teknik Sipil, Fakultas Teknik, Universitas Sangga Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32897/simteks.v3i1.2465

Abstract

Penyelidikan tanah menggunakan CPT(sondir) sangat penting di lakukan untuk mengetahui klasifikasi lapisan dan jenis tanah. Tujuan dari penelitian ini adalah melakukan investigasi lapangan untuk mengetahui karakteristik, mendapatkan data keadaan perlapisan, jenis, sifat-sifat mekanis dan fisis tanah, serta mengetahui seberapa besar kekuatan tanah di kecamatan Dayeuhkolot dan sekitarnya. Pengujian ini  dilakukan di 4 Desa dan 6 Kelurahan sebanyak 20 titik dengan menggunakan metode CPT (sondir) di lapangan  dan pengambilan sampel tanah untuk di analisa index properties dan mecanikal properties di laboratorium. Hasil dari penelitian ini berupa grafik dan peta kekuatan tanah, berdasarkan nilai CPT, UCT, dan Indeks Properties. Adapun berdasarkan grafik korelasi hasilnya adalah Hubungan nilai kohesi (C) dengan tahanan konus (qc) dan kuat tekan bebas (qu), tahanan konus (qc) dengan kuat geser undrain (cu), indeks plastisitas (PI) dengan clay content (lolos#200) berbanding lurus, dan hubungan nilai kuat geser undrain (cu) dengan indeks plastisitas (PI) dan clay content (lolos#200) adalah berbanding terbalik. Hasil penelitian berupa peta Konsistensi tanah berdasarkan nilai qc di kedalaman 1 meter didominasi oleh konsistensi  medium stiff sebesar 55%, berdasarkan nilai qc di kedalaman 3 meter didominasi oleh konsistensi tanah very stiff sebesar 50%, berdasarkan nilai qc di kedalaman 5 meter didominasi oleh konsistensi tanah hard sebesar 64.71%, berdasarkan nilai UCT di kedalaman 1-2 meter didominasi oleh konsistensi tanah medium stiff  sebesar 57.14%, berdasarkan nilai kohesi C di kedalaman 1-6 meter didominasi oleh konsistensi tanah medium stiff sebesar 40% dan tipe tanah berdasarkan nilai indeks plastisitas (PI) di dominasi oleh tipe tanah lempung  dengan  sebesar 85%.
PENGARUH PERMEABILITAS TERHADAP STABILITAS KEAMANAN BENDUNGAN GUNUNGROWO Afrizon Kamiruddin; Abdul Chalid; Agus Sulaeman; Chandra Afriade Siregar
Jurnal Teknik Sipil Vol 18 No 2 (2022): Jurnal Teknik Sipil
Publisher : Universitas Kristen Maranatha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jts.v18i2.4648

Abstract

Gunungrowo Dam has been establishing in 1925, it is located on the Wadi River. This dam is a homogeneous earthfill dam with a height of 20.5 m, with a storage capacity of 5.11 million m3 to supply irrigation water for an area of 6,000 Ha. Because the operational period is approaching 100 years, it is necessary to evaluate the level of stability and safety of the dam. The purpose of this study was to 1) determine the stability of the seepage safety in various reservoir water levels; 2) determine the slope safety stability (Safety Factor) of the dam in various reservoir water level conditions; 3) determine the effect of the dam body core permeability variable on seepage, and 4) determine the effect of the dam body core permeability variable on slope stability. The main discussion in this study is to analyze the stability of the dam safety using the GeoStudio-2012 computer program with SEEP/W features on seepage discharge and SLOPE/W on SF (Safety Factor) slopes. The SEEP/W modeling uses the concept of saturated soil mechanics. The input parameters for slope stability analysis are dam dimensions, type of material, bulk density (γ), cohesion (c), and shear angle (j). The study was conducted on all seepage discharge values and all SF values at minimum water level, normal water level, flood water level and fast receding with calculations without earthquake loads. The results of the study obtained that the SF value, discharge value, stable against landslide hazards and piping hazards met the safety requirements. Furthermore, from the seepage discharge value and the SF value, it is studied how the influence of the dam core permeability variable on the piping hazard and the potential for landslide hazard. From the results of the analysis, it is concluded that the greater the value of the permeability, the greater the seepage discharge and the greater the value of the permeability, the smaller the value of the safety factor.
Co-Authors Abdul Chalid Afrizon Kamiruddin Chandra Afriade Siregar Rully Savitri Nurvita