<span class="fontstyle0">Pekanbaru City has developed quite rapidly. Therefore, local governments are aware of the<br />high demand for multi-story building construction, so that buildings built with more than two floors<br />are required to conduct a land subsidence test. The load of a structure will be transmitted by the<br />foundation to the ground, where the soil is expected to be able to support the load. The soil subsidence<br />test is obtained from the sondir test data or also called the Dutch Cone Penetration Test (DCPT)<br />which is used to determine the profile into the soil continuously with the value of cone tip resistance<br />and blanket resistance (Wafi et al., 2013).The purpose of this study is to analyze the calculation of<br />the settlement of a single pile foundation based on the foundation bearing capacity data from the<br />sondir data obtained from the Riau University Laboratory using the elastic settlement method. The<br />research stages carried out are reviewing theories related to piles, then collecting data including<br />data on the carrying capacity of the foundation and sondir data. The final stage is conducting<br />calculation analysis. The results of this study obtained a map of the elastic settlement of the pile<br />foundation at a depth of 6 meters, 12 meters and 18 meters</span>
Kondisi tanah di provinsi Riau adalah tanah lunak berupa lempung, lanau dan gambut. Tanah lunak umumnya memiliki daya dukung yang rendah dan kompresibilitas yang tinggi. Penggunaan stone column adalah salah satu metode perbaikan tanah yang dapat dilakukan. Penelitian terdahulu menunjukkan pemberian lapisan timbunan pasir di atas stone column dapat memperbaiki kriteria kegagalan bulge kolom dan berkontribusi memberikan perkuatan dan mengurangi beban yang diterima oleh kolom pada bagian atas ataupun dasar. Pada penelitian ini material kolom diganti dengan campuran fly ash dan bottom ash, dan rasio panjang kolom serta tinggi lapisan timbunan pasir divariasikan. Perbandingan fly ash dan bottom ash yang digunakan 40% fly ash + 60% bottom ash. Rasio panjang kolom terhadap diameternya (L/D) yang digunakan adalah 2, 3 dan 4 dengan diameter kolom 5 cm. Tinggi lapisan timbunan pasir divariasikan 2 dan 4 cm. Kolom-kolom dipasang dengan pola segitiga. Tanah lempung asli tanpa perkuatan dan dengan perkuatan kolom dibebani menggunakan hydraulic jack dan dilihat peningkatan daya dukung serta reduksi penurunan yang terjadi. Hasil uji pembebanan menunjukkan semakin besar rasio panjang kolom dan tebal lapisan timbunan pasir maka daya dukung tanah dan reduksi penurunan tanah akan semakin meningkat. Daya dukung dan reduksi penurunan maksimum diberikan oleh kolom L/D 4 dan tinggi lapisan timbunan pasir 4 cm dengan rasio peningkatan daya dukung sebesar 1,74 atau naik sekitar 74% dan rasio reduksi penurunan hingga 0,30 atau berkurang sekitar 70%. Hasil analisis teoritis menunjukkan kecenderungan yang berbeda.
Abstrak Penelitian ini mengkaji tentang pengaruh waktu terhadap peningkatan daya dukung fondasi tiang sirip dan polos. Variasi waktu pengujian dalam penelitian ini adalah 0, 1, 2, 4, 8, 16, 32 dan 64 hari, semua variasi waktu akan di analisis dan membandingkan hasil daya dukung aksial dari fondasi tiang sirip dan polos. Hasil penelitian ini menampilkan hasil perbandingan terbesar antara tiang sirip dan tiang polos yaitu sebesar 538,75%. Pengujian tiang sirip berdasarkan fungsi waktu, daya dukung aksial mengalami penurunan pada waktu pengujian 1, 4, 16 hari. Sedangkan daya untuk tiang polos selalu mengalami peningkatan berdasarkan fungsi waktu. Faktor peningkatan daya dukung (∆10) adalah sebesar 0,054 untuk tiang polos dan 0,014 unuk tiang sirip. Faktor peningkatan hasil penelitian ini lebih kecil dari penelitian sebelumnya, hal ini karena tanah yang digunakan tanah lanau organik. Tanah organik memiliki kadar air yang tinggi dan daya dukung yang rendah terhadap beban. Kata kunci: Pengaruh Waktu, Daya Dukung, Faktor Peningkatan (∆10).
The state of art simulation modelling in managing traffic flow within a busy central business district (CBD) is demonstrated in this article. The objectives of this article were to; identify the existing condition of the street V/C ratios within the CBD area, and to develop various simulations modelling. The development of microscopic traffic simulations encompassing 5 streets within the CBD area in Pekanbaru, Indonesia using the PTV Vissim application was performed as a case study. The existing conditions of these 5 streets were very busy (Level of Service C and D) with on-street parking and on-street traders (vendors) along the streets. Several simulations model based on 4 traffic management approaches were applied; (i) controlling on street traders (vendors) activity, (ii) controlling parking lots, and (iii) changing the on-street parking angle and (iv) combination of these approaches. The simulation results have indicated that the optimum simulation modelling in managing CBD traffic flow within these 5 streets was conducted by managing the on-street parking angle at the position of 300 as well as controlling on street traders activity. Hence, by conducting simulations using this application improved the streets Level of services (LOS) within this CBD area from D (0,75<VC<0,84) to C (0.45<VC<0.74).
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