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MODEL STABILISASI TANAH DASAR UNTUK DISPOSAL AREA KALI SEMARANG Abdul Rochim
Majalah Ilmiah Sultan Agung Vol 50, No 127 (2012): Jurnal Majalah Ilmiah Sultan Agung,Maret - Mei 2012
Publisher : Majalah Ilmiah Sultan Agung

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Abstract

This study presents the analysis of ground settlement and stabilisation that aims to estimate the soil types, ground settlement and stabilization of the soil in Disposal Area Semarang River. The data of the two soils from this area was used as samples to represent the average soil condition. A preloading model by applying five meter embankment was used to consolidate the soil. To estimate the immediate and consolidation settlement and the change of excess pore water pressure, PLAXIS application program was used. Based on the analysis from 30 meter soil layer of the two soil samples, it was shown that this area of Semarang River had the soil type SE or soft soil. Having the embankment as load, there was the settlement as big as 2.57-2.64 meters in which took 64.5 years to happen with the consolidation degree 90 per cent that was equal to the settlement 4 centimeters per year. From the stage constructions in PLAXIS, the result was reliable as to the increase of shear strength after consolidating. It was shown that there was the increase of shear strength amounting to 13 per cent from 282.61 kN/m2 (initial condition) to 318.75 kN/m2 (after consolidation). To decrease the time for soil to consolidate,  vertical and horizontal drains can be proposed. With the vertical drain having distance in between 1 meter and a triangle pattern, the time to reach the full settlement just 4.2 weeks. Key words :     Soil types, settlement, preloading, vertical drain, Disposal Area Kali Semarang
IDENTIFIKASI SERAT BAMBU MENGGUNAKAN EKSTRAKSI CIRI STATISTIK ORDE 2 (GLCM) DAN PENGUKURAN JARAK K-NN Khoiriya Latifah; Abdul Rochim; Bambang Supriyadi
JURNAL TEKNIK INFORMATIKA Vol 12, No 2 (2019): JURNAL TEKNIK INFORMATIKA
Publisher : Department of Informatics, Universitas Islam Negeri Syarif Hidayatullah

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (616.185 KB) | DOI: 10.15408/jti.v12i2.8946

Abstract

Indonesia is a large bamboo producer. Many benefits can be taken from bamboo trees, among others, as an alternative material for environmentally friendly construction, handicraft, and even become a safe material for use. Based on the property of its mechanical strength, bamboo has high tensile strength and fiber content, including fiber length, inter-fiber adhesive, namely lignin and the higher diameter of bamboo fiber, causing bamboo stems to become stronger and stiffer so that bamboo quality is getting better. One objective is to use a texture analysis of statistical features extraction of digital image processing. Feature extraction is a process to get the characteristics of visual perception. Texture information can be used to distinguish the surface properties of objects in images that are related to coarse and fine. This research uses a second-order statistical calculation of Gray Level Co-occurrence Matrices (GLCM) by measuring contrast, energy, homogeneity, and correlation levels to determine roughness from bamboo image textures that have irregular patterns. The second method is to use similarity measurements with the K-NN method in which in this study K = 3 with testing images of 28 images obtained an accuracy of 0.8, precission of 0, 8 and f-measurement of 0.9.
ANALISIS CONTRACT CHANGE ORDER PADA PELAKSANAAN PROYEK APARTEMEN ALTON SEMARANG Muhammad Abdul Khalim; Henny Pratiwi Adi; Abdul Rochim
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol 26, No 2 (2021): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v26i2.3135

Abstract

A contract change order (CCO) is a job change activity in a construction project that is carried out during the work implementation period. This study aims to determine the factors that cause contract change orders, analyze the impact given if there is a contract change order and analyze what strategies must be done to resolve the occurrence of contract change orders in the implementation of the Alton Apartment building construction project located in the city of Semarang. The data collected in this study used a semi-structured interview method with competent sources in their field, while the sources for data collection were construction management consultants (MK), contractors & owners. The Strength, Weakness, Opportunity, Threats (SWOT) analysis method is used to determine the right strategy to deal with CCO activities. The conclusion of the study, CCO was caused by an imperfect design that resulted in the achievement of time and costs not being on target, the strategy was obtained by accelerating work, controlling each work and project cashflow and referring back to the wholesale contract that was mutually agreed upon in the event of a dispute.
THE COMPARISON OF ROAD CAPACITY OF GREENSHIELD MODEL, GREENBERG MODEL AND UNDERWOOD MODEL TOWARD MKJI 1997 CALCULATION ON THE JENDRAL SUDIRMAN ROAD, BATANG Farhan Sholahudin; Abdul Rochim
Pondasi Vol 24, No 1 (2019): Juni 2019
Publisher : UNISSULA Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/pondasi.v24i1.4995

Abstract

Jendral Sudirman road is one of the streets in Batang Regency which has function as primary artery and it has main access to connect vital locations. It makes Jendral Sudirman road has several transportation problems. In the planning, design and establishment of various transportation system policies, traffic flow theory of movement has very important role. To facilitate the application of traffic flow theory of movement used a mathematical approach which was used to analyze the phenomenon that took place in the traffic flow. One of approach ways to comprehend the traffic behavior was by verifying it into mathematical and graphics relationships with observing to the relationship among the speed (S), density (D) and volume (V) traffic.The objective of this study was to determine traffic flow characteristics on Jendral Sudirman Road consisting of three (3) main parameters such as volume, speed and density by using mathematical models included Greenshield, Greenberg and Underwood Model. In addition, this study also aimed to determine the results of a comparison of one of the chosen model with the road capacity calculation based on MKJI 1997.Based on the data analysis  by using Greenshield model, it was known that the characteristics of the traffic on Jendral Sudirman road values obtained free flow speed (Sf)= 45.53 km/h, density jam (Dj)= 38.31 unit/km and maximum volume or road capacity(Vmax)= 1774.25 unit/hour. The estimation result of model was calculated using Greenshield model and estimation capacity calculations of MKJI 1997 had a difference about 15.49%. This could be evidence that generalize the use of manual book as MKJI 1997 in estimating the value of a certain road location capacity without researching driver behavior, vehicle characteristics and the environment of the road would be at risk in the capacity estimation results obtained. Therefore, the use of existing guidelines such as the 1997 MKJI needs carefulness in assessing the environmental condition of the road and traffic characteristics.Keywords : TrafficCharacteristic, Volume, Speed, Density, Greenshield, Greenberg, Underwood
ANALISIS STABILITAS LERENG DENGAN PENDEKATAN VALUE ENGINEERING Ardian Fachrurrozi; Abdul Rochim; Rachmat Mudiyono
Jurnal Ilmiah Teknosains Vol 8, No 1/Mei (2022): JITEK
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jitek.v8i1/Mei.11161

Abstract

Penelitian ini dilatar-belakangi oleh adanya potensi longsor yang cukup tinggi di daerah sekitar DAS Gung kabupaten Tegal. Salah satu faktor yang berpengaruh terhadap potensi longsor adalah penggunaan lahan vegetasi penutup di sekitar daerah tersebut. Lahan konservasi yang seharusnya ditanami berbagai tanaman keras diganti dengan tanaman pertanian yang memiliki akar serabut dangkal. Tujuan penelitian ini adalah mendesain beberapa alternatif perbaikan tanah dan mengkaji sejauh mana penerapan analisis Value Engineering pada lereng sungai di Desa Guci, Kecamatan Bumijiwa, Kabupaten Tegal. Jenis penelitian ini adalah explanatory research, tentang proyek Perencanaan Konservasi DAS Gung. Pemodelan pada Penelitian ini diperlukan untuk menganalisis hasil Total Displacement pada tanah penurunan analisa stabilitas lereng pada pembangunan perencanaan Dinding Penahan Tanah dan hasil Value Engineering. Perencanaan struktur ini menggunakan program Plaxis 8.2, diperoleh 3 alternatif perbaikan lereng yaitu Retaining Wall, Sheetpile Wall dan Revetment Wall. Penerapan Stabilitas Lereng Pada 3 Alternatif perbaikan lereng menggunakan Plaxis 2D menghasilkan keluaran berupa Safety Factor dan Penurunan Tanah mencapai angka aman untuk dilakukan pekerjaan konstruksi dikarenakan nilai keamanan melebihi ambang batas yaitu lebih dari 1,5 (>1,5). Melalui analisa value engineering dapat disimpulkan bahwa setelah dianalisa dengan perbandingan nilai cost dan worth DPT Alternatif 1 Sheetpile Wall menunjukkan nilai penghematan yang paling besar dan dengan analisa metode paired comparison didapatkan nilai DPT Alternatif 1 Sheetpile Wall dengan biaya Rp. 345.543.185 atau ada penghematan sebesar Rp. 893.037.900 dari DPT Rencana Retaining Wall dan ada Penurunan biaya dari DPT Rencana Retaining Wall sebesar 57,8%.