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Idharmahadi Adha
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Korelasi Daya Dukung Tanah dengan Kuat Geser Menggunakan Alat Vane Shear dan Direct Shear Adama, Riri Arinda; Setyanto, setyanto; Adha, Idharmahadi
Jurnal Rekayasa Sipil dan Desain Vol 5, No 3 (2017): Edisi September 2017
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract

The soft clay soil has expansive behavior that expands when exposed to water, this will be very dangerous to the construction to be built on it, because clay soil generally has a low shear strength and high compressibility. To know the parameters and characteristics of strong clay soil shear in an area, can use vane shear test and direct shear test. The soil samples were taken from Jabung, East Lampung for testing laboratory modeling on glass box with vane shear and direct shear tools with a weight of  ± 130,730 grOn the direct shear tests when soil conditions remolded at a depth of 30 cm shear strength values obtained at 0.0743 kg/cm2, on vane shear test obtained 0.38 kg/cm2 with soil bearing capacity of 0.6048 kg/cm2, at a depth of 50 cm obtained a shear strength value of 0.0779 kg/cm2, on vane shear test obtained 0.54 kg/cm2 with soil bearing capacity of 0.6738 kg/cm2. In saturated soil conditions a depth of 30 cm obtained a shear strength value in the direct shear test of 0.0553 kg/cm2, the vane shear test of 0.46 kg/cm2 with a bearing capacity of 0.4116 kg/cm2, a depth of 50 cm obtained shear strength value of 0.0743 kg/cm2, the vane shear testing with a 0.65 kg/cm2 earned bearing capacity of 0.6308 kg/cm2. From the test results direct shear test and vane shear test known that the shear strength in direct shear tests is smaller than the vane shear test. Keywords: Vane shear, direct shear, Clay soil shear strength, Soil bearing capacity.
Study Perbandingan Antara Uji Proctor Modified Dengan Alat Tekan Pemadat Modifikasi Berdasarkan Tekanan Kontak pada Alat Berat Pemadat Tanah Situmeang, Tipo Putra; Setyanto, Setyanto; Adha, Idharmahadi
Jurnal Rekayasa Sipil dan Desain Vol 6, No 1 (2018): Edisi Maret 2018
Publisher : Jurnal Rekayasa Sipil dan Desain

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Pemadatan tanah merupakan salah satu pekerjaan penting dalam setiap proyek perkerasan jalan. Pemadatan tanah berfungsi untuk meningkatkan kekuatan tanah yang memberikan daya dukung kepada lapisan jalan di atasnya, serta juga berfungsi untuk mengurangin besar penurunan tanah yang tidak diinginkan. Dalam setiap pemadatan tanah diperlukan kadar air optimum untuk mencapai kepadatan maksimum yang dapat diketahui dengan uji proctor . Uji proctor yang masih manual dalam pemberian bebannya mengakibatkan membutuhkan tenaga manusia yang cukup besar dalam penggunaannya. Pada penelitian ini membandingkan uji proctor modified dengan pemodelan alat tekan pemadat modifikasi dengan menggunakan tekanan kontak alat berat pemadat tanah dalam usaha mengantikan uji proctor manual dengan alat modifikasi yang lebih praktis. Tanah yang digunakan adalah tanah timbunan pilihan, berasal dari Desa Gedung Agung, Kecamatan Jati Agung, Lampung Selatan. Pengujian alat tekan pemadat modifikasi ini terdiri dari 4 tekanan berbeda yaitu 1,667 Mpa; 6,2 Mpa; 7 MPa dan 8,4 MPa, menggunakan tiga sampel tanah pada masing-masing tekanan. Hasil pengujian di laboratorium menunjukkan bahwa berat volume maksimum (γdmaks) sebesar 1,706 gr/cm3 pada pengujian metode proctor modified dengan hasil pada alat tekan pemadat modifikasi didapat nilai tekanan sebesar 8 MPa.
PENGARUH RESAPAN AIR (WATER ADSORPTION) TERHADAP DAYA DUKUNG LAPIS PONDASI TANAH SEMEN (SOIL CEMENT BASE) Adha, Idharmahadi
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 13, No 1 (2009): Edisi April Tahun 2009
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Semen merupakan bahan additive yang sangat baik digunakan pada metoda stabilitasi tanah untukpelaksanaan konstruksi jalan raya. Kerusakan pada struktur perkerasan jalan yang menggunakanlapis pondasi tanah semen, tidak hanya disebabkan oleh beban lalu lintas, tetapi dapat diakibatkanoleh genangan air pada saat musim hujan. Pengujian daya dukung lapis pondasi semen sebagaiakibat proses resapan air, dilaksanakan menggunakan periode siklus.. Berdasarkan pengujian,ternyata bahwa nilai CBR laboratorium lapis pondasi tanah semen dengan durasi waktu resapanair yang lama, pada siklus keempat didapat nilai CBR sebesar 98 % (< 100 %), dan dengandurasi waktu resapan air yang lebih singkat, pada siklus kedua belas nilai CBR mencapai 108 %(> 100 %). Hal ini berarti. bahwa bila konstruksi lapis pondasi tanah semen akan tergenang setiaptahun pada saat musim hujan, maka pada tahun keempat konstruksi lapis pondasi tanah sementersebut, tidak lagi memenuhi persyaratan teknis, yaitu minimal nilai CBR sebesar 100 %.
Analysis And Planning of Bored Pile Foundation In Double Train Bridge Way Changes In Central Lampung Regency Hendri, Adit Pratama; Arifaini, Nur; Adha, Idharmahadi
Jurnal Rekayasa Sipil dan Desain Vol. 7 No. 4 (2019): Edisi Desember 2019
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v7i4.1232

Abstract

Indonesia has considerable coal reserves, but only a few or even very few can be exploited. The potential of coal owned by South Sumatra Province is known to reach around 85% of the total reserves contained in Sumatra, or around 22.24 billion tons. This means that even though mining is maximized to 50 million tons per year, coal will not be mined for 200 years. To maximize the potential of available coal, modes are needed from the train, but for now there is only one mode used to extract coal from it to transport coal from Tarahan - Tanjung Enim or vice versa. So to maximize the coal's potential, the Ministry of Transportation through the Directorate General of Railways plans to build a double track railway line between Tarahan - Tanjung Enim, one of the roads going through the river is needed a bridge to facilitate the train journey to transport the coal. The railroad bridge that was built was located in KM132 in the burial way of Central Lampung Province. In this bridge construction, the carrying capacity of the foundation needs to be analyzed so that it can withstand the burden of the upper structure and the train.From the results of the study showed that the analysis of the carrying capacity of the permit pile of 1700 kN was greater than the maximum carrying capacity that burdened the pile of 1508.93 kN so that it could be concluded that the structure under the bridge was able to withstand the load from the upper structure. Keywords: analysis, coal, bridge, carrying capacity.
ANALISIS PERMEABILITAS TANAH YANG DIPADATKAN DENGAN MENGGUNAKAN METODA CUBIC PERMEAMETER Alnasir, Mohammad Yogi; Afriani, Lusmeilia; Adha, Idharmahadi
Jurnal Rekayasa Sipil dan Desain Vol. 8 No. 1 (2020): Edisi Maret 2020
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v8i1.1287

Abstract

AbstractThe development of infrastructure in Indonesia is increasing in various regions such as the construction of reservoirs, dams and other construction. One of the important things that became the basis of development is foundation ground. Therefore, it is necessary to know the type of soil used and the permeable nature of the soil. Soil permeability illustrates the ability of soil to pass water. In this study to determine the permeability of the soil by using a cubic mold and compare the results of soil permeability obtained from compacted soil using the pressure method and the standard method. Soil samples used were from Pamenang village, Pringsewu. Soil taken is disturbed and undisturbed soil samples. The soil was then compacted by a standard method and with a pressure test method at a pressure of 5 MPa, 10 MPa and 15 MPa. Then the permeability test is carried out to get the permeability coefficient. The results of observations in the laboratory show the greater pressure applied to the soil, the smaller coefficient of permeability. The relationship between the permeability coefficient with standard compaction method and the pressure method get the permeability coefficient value so that the pressure is between 5 to 10 MPa. Keywords: Soil, Compaction, Pressure and Permeability. AbstrakPerkembangan pembangunan infrastruktur di Indonesia sedang meningkat diberbagai daerah seperti pembangunan waduk, embung, bendungan dan konstruksi lainnya. Salah satu hal penting yang menjadi dasar dalam pembangunan adalah pondasi tanah. Oleh karena itu, perlu mengetahui jenis tanah yang dipakai dan sifat permeable tanah tersebut. Permeabilitas tanah menggambarkan kemampuan tanah dalam meloloskan air. Pada penelitian ini untuk mengetahui permeabilitas tanah dengan menggunakan mold segiempat dan membandingkan hasil permeabilitas tanah yang didapatkan dari tanah yang dipadatkan menggunakan metode tekanan dan secara metode standar. Sampel tanah yang digunakan berupa sampel tanah yang berasal dari desa Pamenang, Pringsewu. Tanah yang diambil merupakan sampel tanah yang terganggu dan sampel tanah tak terganggu. Tanah tersebut selanjutnya dipadatkan dengan metode standar dan dengan alat uji metode tekanan pada tekanan 5 MPa, 10 MPa, dan 15 MPa. Selanjutnya dilakukan pengujian permeabilitas untuk mendapatkan nilai koefisien permeabilitasnya. Hasil dari pengamatan di laboratorium menunjukan semakin besar tekanan yang diberikan pada tanah maka semakin kecil koefisien permeabilitasnya. Hubungan koefisien permeabilitas dengan metode pemadatan standar dan metode tekanan memperoleh nilai koefisien permeabilitas sehingga tekanan berada diantara nilai 5 sampai 10 MPa.  Kata kunci: Tanah, Pemadatan, Tekanan dan Permeabilitas.
Analysis of Supportive Lower Structure Building on Overpass Construction In The Sumatera Trans Toll Road Lidyawati, Dian Erlisa; Adha, Idharmahadi; Purwadi, Ofik Taufik
Jurnal Rekayasa Sipil dan Desain Vol. 8 No. 1 (2020): Edisi Maret 2020
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v8i1.1288

Abstract

Every light or heavy load construction recquires a supportive foundation, the foundation must be calculated to be able to guarantee the stability of the building to its own weight, building loads and external forces. Pillar foundation is used as a building foundation when the land under the building does not provide sufficient carrying capacity to carry the weight of the building and its load. This research was carried out on one of the bridges on the Trans Sumatra Toll Road. A pillar foundation is used to the toll road project. The purpose of this research is to determine the bearing capacity of the foundation on the pier and abutment from the results of load on the upper construction. Based on the results of the carrying capacity of abutment is obtained 60 cm diameter of pile with 6 pieces, and the bridge’s pillar is 60 cm of pile 15 pieces. While the main reinforcement diameter is 22 mm as much as 6 pieces, with Ø10 strap and 250 mm distance.  Keywords: Foundation, Pillar, Pile, Pile Carrying Capacity
Aplikasi hasil Eksperimen Pemadatan Tanah Untuk Konstruksi Embung Berdasarkan Metode Tekanan Rahmadani, Eria Zundi; Adha, Idharmahadi; Purwadi, Ofik Taufik
Jurnal Rekayasa Sipil dan Desain Vol. 8 No. 2 (2020): Edisi Juni 2020
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v8i2.1315

Abstract

Peningkatan akan kebutuhan air untuk irigasi maupun kebutuhan air baku, membuat Pemerintah Provinsi Lampung perlu meningkatakan insfrastruktur pada bidang pengairan atau irigasi, maka perlu dilakukan pembuatan Bendungan. Di Universitas Lampung sendiri telah di bangun Embung digunakan untuk mengatur atau menampung aliran air hujan, meningkatkan kualitas air serta dapat menjaga kualitas air tanah dan mencegah banjir. Pada dasarnya untuk membangun sebuah konstruksi sangat berkaitan erat dengan sifat fisik dan mekanis pada tanah. Hal tersebut dikarenakan tanah adalah material yang berperan sangat penting sebagai pendukung suatu konstruksi. Pada penelitian ini menggunakan dua pemadatan, yaitu pemadatan dengan menggunakan tumbukan dan pemadatan dengan menggunakan tekanan yang menggunakan standard proctor. Penelitian ini bertujuan untuk  mengetahui perbandingan  dengan menggunakan tumbukan dan  menggunakan metode tekanan. Pemadatan dilakukan berdasarkan metode tumbukan dan tekanan. Metode tekan digunakan alat tekan modifikasi dengan tekanan 5 MPa, 10 MPa, dan 15 MPa. Dari hasil penelitian dilaboratorium dengan metode tumbukan didapatkan berat volume kering sebesar 1,7 gr/cm³. bila dikonversi  terhadap uji tekan modifikasi didapatkan nilai sebesar 7 MPa. Kata Kunci : Pemadatan Metode Standard, Pemadatan Metode Tumbukan, Ydalik   
Evaluasi Diameter Partikel Tanah Terhadap Derajat Kepadatan Tanah Menggunakan Metode Tekanan Adyaksa, R. Nofan Hendra; Adha, Idharmahadi; Setyanto, Setyanto
Jurnal Rekayasa Sipil dan Desain Vol. 8 No. 3 (2020): Edisi September 2020
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v8i3.1445

Abstract

Soil is a material to build any infrastructure. So, soil becomes very important and influential in construction. Soil quality determine the power of construction on it, the good soil is soil that has a high density in each particles and contain less water levels. The quality of soil is depending on physic and mechanic soil condition, that’s why we need to test it out. Soil compaction is process of increasing the soil density by reducing the particles proximity so it can reduce the air volume. Compaction is divided into four types. In this research is using two types of compactions that are type A and Type C with purpose to find out the effect of soil particles diameter by passing sieve analysis to soil compaction.Compaction is done based on blow method and pressure method. In pressure method is using modification compaction tool with 5 Mpa, 10 Mpa, and 15 Mpa pressures.The result of this research can be conclude that the blow method compaction type A has a higher water content than type C, but the value of maximctum dry volume weight Type C higher than type A. In pressure method it can be concluded that as the higher pressure so the water content and the maximum dry volume weight are also getting higher.
Komparasi Kadar Daya Dukung Tanah Berbutir Halus Berdasarkan Uji CBR Menggunakan Alat Tekan Modifikasi dan Modified Proctor Damayanti, Amelia Nurul; Adha, Idharmahadi; Zakaria, Ahmad
Jurnal Rekayasa Sipil dan Desain Vol. 8 No. 4 (2020): Edisi Desember 2020
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v8i4.1635

Abstract

The importance of soil as construction material needs to be considered carefully. With various soil conditions, a physical test is required to discover the characteristics of the soil and California Bearing Ratio (CBR) test in a laboratory to determine the bearing capacity of the basic land (subgrade). This research was conducted to assess the suitability of the CBR test value with two different compaction tools. The results of this study showed that the soils were classified into A-6 clay soil type. On the modified proctor compaction test, the maximum weight volume (γdmaks) was 1,70 gr/cm3, while the compaction with modified press tool obtained 1,75 gr/cm3. Based on the results of the values obtained from CBR standard test is 11,5% and 1,32% for the soaked sample .While the CBR value without immersion with modified press tool are 7,7% for 3 MPa, 16,2% for 6 MPa, 19,5% for 9 MPa, 20,5% for 12 Mpa. For the soaked samples are 1,53% for 3 Mpa, 2,7% for 6 Mpa, 3,56% for 9 Mpa, and 4,33% for 12 Mpa. In conclusion, the CBR value escalation is higher when using the modified pressure tool compared with the CBR standard method.
Co-Authors Adama, Riri Arinda Adyaksa, R. Nofan Hendra Ahmad Zakaria Alnasir, Mohammad Yogi Damayanti, Amelia Nurul Hendri, Adit Pratama Lidyawati, Dian Erlisa Lusmeilia Afriani Nur Arifaini Ofik Taufik Purwadi, Ofik Taufik Rahmadani, Eria Zundi Setyanto Setyanto Situmeang, Tipo Putra