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Aplikasi statistika dalam menentukan nilai karakteristik tanah: sebuah studi pustaka Setiawan, Budhi
Indonesian Journal on Geoscience Vol 3, No 2 (2008)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol3no2.20083In this paper, determination of characteristic value of soil properties based on a statistical method is explained. The value in the limit state design is not the point value as measured by a laboratory or field test. Two confusing concepts in statistical soil mechanics are: the modeling of variability by a random field model and the distinction between the population mean and sample mean. Intrinsically, these two concepts are related to each others. The paper demonstrates that the most confusing thing what is being dilemmas in determining soil characteristic value may be removed by considering a statistical method. Â

Aplikasi statistika dalam menentukan nilai karakteristik tanah: sebuah studi pustaka Setiawan, Budhi
Indonesian Journal on Geoscience Vol 3, No 2 (2008)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol3no2.20083In this paper, determination of characteristic value of soil properties based on a statistical method is explained. The value in the limit state design is not the point value as measured by a laboratory or field test. Two confusing concepts in statistical soil mechanics are: the modeling of variability by a random field model and the distinction between the population mean and sample mean. Intrinsically, these two concepts are related to each others. The paper demonstrates that the most confusing thing what is being dilemmas in determining soil characteristic value may be removed by considering a statistical method. Â

Aplikasi statistika dalam menentukan nilai karakteristik tanah: sebuah studi pustaka Setiawan, Budhi
Indonesian Journal on Geoscience Vol 3, No 2 (2008)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.3.2.89-93

http://dx.doi.org/10.17014/ijog.vol3no2.20083In this paper, determination of characteristic value of soil properties based on a statistical method is explained. The value in the limit state design is not the point value as measured by a laboratory or field test. Two confusing concepts in statistical soil mechanics are: the modeling of variability by a random field model and the distinction between the population mean and sample mean. Intrinsically, these two concepts are related to each others. The paper demonstrates that the most confusing thing what is being dilemmas in determining soil characteristic value may be removed by considering a statistical method. Â

AIR TANAH UNTUK ADAPTASI PERUBAHAN IKLIM DI MALANG, JAWA TIMUR: Penilaian Risiko Penurunan Ketersediaan Air Munib Ikhwatun Iman; Edi Riawan; Budhi Setiawan; Oman Abdurahman
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 27, No 1 (2017)
Publisher : Indonesian Institute of Sciences

Risk of water shortage related to climate change in Malang Regency has been conducted by climate projection model until 2030 based on baseline data in 1960-1990 as a normal condition. The projection as a trigger for an early warning of the water shortage hazard has shown trend of temperature increase and change of precipitation.To measure the vulnerability can be simplified based on three dominant factors which were water source for availability, water demand, and population welfare. The vulnerability has spread in the west and the south region spatially that increasing from high to very high risk in 2030. Population growth and land-use change were conducted the main factor as non-climatic driven related to hazard and vulnerability of water availability. Analysis result has conducted higher risk depends on its hydrogeology. Groundwater can take a part for adaptation to climate change if it could be managed optimally.AbstrakRisiko penurunan ketersediaan air akibat perubahan iklim di Malang, Jawa Timur dikaji melalui analisis skenario proyeksi model hingga tahun 2030 terhadap basis data tahun 1960-1990 sebagai kondisi acuan normal. Hasil proyeksi iklim sebagai pemicu awal bahaya perubahan iklim menunjukkan pola kenaikan suhu dan penurunan presipitasi yang berdampak atau berisiko pada adanya potensi penurunan ketersediaan air di Malang. Untuk mengukur dan menentukan upaya pengurangan risiko tersebut dilakukan pendekaatan analisis bahaya penurunan ketersediaan air dan kerentanan terhadapnya akibat perubahan iklim. Kerentanan dimaksud di Malang secara sederhana ditentukan oleh tiga faktor yang dinilai dominan, yaitu kebutuhan air, sumber air, dan kesejahteraan masyarakatnya. Kerentanan secara spasial memperlihatkan wilayah bagian barat dan selatan Malang mengalami peningkatan nilai risiko penurunan ketersediaan air dari tinggi menjadi sangat tinggi pada tahun 2030. Pertumbuhan penduduk dan perubahan tata guna lahan merupakan faktor non-klimatik yang mempengaruhi bahaya dan kerentanan penurunan ketersediaan air. Hasil analisis memperlihatkan adanya peningkatan risiko yang lebih tinggi yang dipengaruhi kondisi hidrogeologi yang terkait potensi airtanahnya. Pengelolaan airtanah yang optimal diharapkan dapat memberikan kontribusi sebagai salah satu upaya adaptasi terhadap risiko perubahan iklim atas sumber air di Malang.

Aplikasi statistika dalam menentukan nilai karakteristik tanah: sebuah studi pustaka Budhi Setiawan
Indonesian Journal on Geoscience Vol 3, No 2 (2008)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol3no2.20083In this paper, determination of characteristic value of soil properties based on a statistical method is explained. The value in the limit state design is not the point value as measured by a laboratory or field test. Two confusing concepts in statistical soil mechanics are: the modeling of variability by a random field model and the distinction between the population mean and sample mean. Intrinsically, these two concepts are related to each others. The paper demonstrates that the most confusing thing what is being dilemmas in determining soil characteristic value may be removed by considering a statistical method.

Analisis Penurunan Muka Tanah Kota Jambi Dengan Metode Differential Interferometry Synthetics Aperture Radar Tahun 2016 – 2021 Gallant Dwi Pangestu Nugroho Akbar; Budhi Setiawan
Jurnal Geosains dan Remote Sensing Vol 3 No 1 (2022): JGRS Edisi Mei
Publisher : Department of Geophysical Engineering, Faculty of Engineering, University of Lampung

Kota Jambi merupakan kota yang berkembang pesat di Indonesia. Peningkatan penduduk disertai dengan pembangunan infrastruktur dan kebutuhan air tanah yang meningkat setiap tahunnya dapat menyebabkan subsiden. Secara geologi sebagian Kota Jambi terbentuk dari formasi geologi berumur Kuarter yang masih tergolong muda sehingga kemungkinan terjadi kompaksi yang dapat menyebabkan subsiden. Tujuan dari penelitian ini untuk melakukan pemetaan wilayah penurunan muka tanah (land subsidence) Kota Jambi dengan memanfaatkan citra Sentinel-1, metode yang digunakan dalam penelitian ini adalah DInSAR. Mempunyai ketelitian mencapai sentimeter untuk melihat besar deformasi. Data yang digunakan pada penelitian ini adalah citra satelit sentinel-1a level 1 (2016 – 2021) serta data pembangunan daerah dari BAPPEDA Kota Jambi untuk validasi di lapangan. Data tersebut diolah menggunakan software SNAP dan ArcGIS 10.6. Hasil dari pengolahan DInSAR menunjukkan daerah Kota Jambi mengalami subsiden di dominasi pada wilayah dengan tingkat penggunaan lahan yang tinggi, nilai rata-rata per tahun sebesar 11,28 cm/tahun, dan subsiden maksimum per tahun sebesar -8,6 cm pada tahun 2019 di kecamatan Jambi Selatan dan kecamatan Pasar sebesar -7,7 cm pada tahun 2021. Disarankan adanya penelitian menggunakan metode pengukuran langsung di lapangan seperti metode GPS agar hasil yang didapatkan lebih akurat.

Identifikasi Peningkatan Strength Factor Dengan Metode Q-System Pada Terowongan Tambang Bawah Tanah Daerah Perambahan, Kota Sawahlunto, Sumatera Barat Pebby Putra Juenda; Harnani Harnani; Budhi Setiawan
MINERAL Vol 7 No 2 (2022): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v7i2.3418

Underground mining activities (Undergound Mining) at PT Allied Indo Coal Jaya Encroachment area, Sawahlunto City has the risk of subsidence due to reduced soil carrying capacity due to excavation of underground mine openings. The excavation of underground mine openings will result in disruption of the stability of the area such as roof collapse, rib spalling, and floor heave. This research was conducted in 2 research locations, namely Tunnel 6 Seam B and Tunnel 3 Seam C which aims to determine the recommendation of a buffer system in underground mine openings (Tunnel) by analyzing the geomechanical value of rocks using the Rock Tunnelling Quality Index (Q-System) method. ) so that the Strength Factor value increases. Data collection methods were carried out by field observation and laboratory testing, while data processing used Phase 8.0 software with Mohr-Coulomb failure criteria. The results of calculations and data processing showed that the Strength Factor value in Tunnel 6 Seam B was 1,04 (relatively stable) and Tunnel 3 Seam C was 0,84 (unstable). These results indicate that Tunnel 6 Seam B and Tunnel 3 Seam C must be supported by a buffer system. After the buffering system was carried out the Strength Factor value of Tunnel 6 Seam B increased to 1,59 (stable) and Tunnel 3 Seam C increased to 1,63 (stable).

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