Hary Christady Hardiyatmo, Hary Christady
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Uji Beban Timbunan yang Diperkuat dengan Sistem Pelat Terpaku pada Tanah Gambut Waruwu, Aazokhi; Hardiyatmo, Hary Christady; Rifa’i, Ahmad
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 25, Nomor 2, DESEMBER 2019
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (473.925 KB) | DOI: 10.14710/mkts.v25i2.21018

Abstract

One of the problems with peat soils, when subjected to imposed loads of construction, is the very high compression and long-term excessive settlement. The embankment can be built on peat soil, but it needs reinforcement that can contribute to increasing the stability of the embankment. The nailed slab system, as reinforcement, is expected to reduce settlement and increase the stability of peat soil. The aim of this paper is to study the effect of pile length and distance on the reduction of settlement in both monolithic and non-monolithic piles. The embankment load test was conducted on 70 cm x 120 cm plates, which were reinforced pile with different lengths and distances in the peat soil layer. The analysis was conducted on the reduction settlement of monolithic and non-monolith pile. The results showed that the length and distance of the pile had an effect on the reduction settlement. Changes in pile length are more dominant reducing settlement compared to changes in pile distance. Pile connection with slab has a significant effect on different lengths of piles than different distances piles.
BEHAVIOR OF NAILED-SLAB SYSTEM ON SOFT CLAY DUE TO REPETITIVE LOADINGS BY CONDUCTING FULL SCALE TEST Puri, Anas; Hardiyatmo, Hary Christady; Suhendro, Bambang
Prosiding Forum Studi Transportasi Antar Perguruan Tinggi The 17th FSTPT of International Symposium
Publisher : FSTPT Indonesia

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Abstract

The Nailed-slab System is not a soil improvement method, but rather as an alternative method to improve the performance of rigid pavement on soft soils. The installed piles under the slab were functioned as slab stiffeners. This research is aimed to learn the behavior of Nailed-slab System under repetitive loadings and its consideration for practical application. The full scale Nailed-slab System was conducted on soft clay which consisted of 6.00 m x 3.54 m slab area with 0.15 m in slab thickness, 15 short micro piles (0.20 m in diameter, 1.50 m in length, and 1.20 m in pile spacing) as slab stiffeners which installed under slab. Piles and slab were connected monolithically, then in due with vertical concrete wall barrier on the two ends of slab. The system was loaded by vertical repetitive loadings. Results show that the installed piles under the slab which embedded into the soils were functioned as slab stiffeners and were able to response similarly in 3D. This system has higher resistance due to vibration. Thereby, the Nailed-slab system is promising for practical application.
Mineralogical and Geochemical Control of Altered Andesitic Tuff upon Debris Slide Occurences at Pelangan Area, Southern Mountain of Lombok Island, Indonesia Winarti, Dwi; Karnawati, Dwikorita; Hardiyatmo, Hary Christady; Srijono, Srijono
Journal of Applied Geology Vol 1, No 1 (2016)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2054.489 KB) | DOI: 10.22146/jag.26953

Abstract

Debris slides were recently found in the Pelangan area at Southern Mountain of Lombok Island, Indonesia. Pelangan is well known as the gold mineralization and hydrothermal alteration area. This study is aimed to identify the mineralogy and geochemistry of altered andesitic tuff that controlled slope instability and induced debris slides. For this purpose, it is necessary to prepare the field observation and laboratory analyses. Landslide inventory reveals that the Pelangan debris slides mostly occur in altered andesitic tuff. Based on the outcrop observations in the field, andesitic tuff found around the Pelangan debris slides have been altered in general. The strong intensity of alteration developed by hydrothermal alteration in this study area produces large amount of clay minerals especially montmorillonite, kaolinite, and illite. The abundance of those clay minerals reflect the intermediate argillic alteration. Montmorillonite is a type of clay mineral that easily swells at wet condition and easily shrinkages at dry condition. Swelling of clay mineral destroys intersheet and interlayer bonds, and reduces shear strength. The presence of clay minerals in the altered andesitic tuff of intermediate argillic zone can be considered as one of the factors that induced to the Pelangan debris slides. Further studies on geotechnical and slope stability analysis of the landslide area are crucial to be done for better understanding of the characteristics of the altered rocks inducing hazardous landslides.
Alternatif Solusi Pembangunan Perkerasan Jalan Pada Subgrade Berdaya Dukung Rendah Hardiyatmo, Hary Christady
INFO-TEKNIK 2016: Prosiding Semnas Teknik Sipil 2016
Publisher : Engineering Department, Lambung Mangkurat University

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Abstract

Sistem perkerasan harus dirancang tahan-lama, sehingga tidak mengalami kerusakan prematur akibat pengaruh lingkungan.Perkerasan yang terletakpada tanah-dasar yang teletak padatanahfondasi (timbunan)lunak atau ekspansif, sering mengalami deformasi yang berlebihan oleh beban kendaraan beratmaupunolehpenurunan konsolidasi akibatberat sendiri timbunan.Demikian pula, bila tanah-dasar mengalami gerakan naik turun akibat kembang-susut tanah di bawahnya  oleh berubahnya musim. Akibat kembang-susut tanah- dasar yang tidak seragam, perkerasan menjadi bergelombang tidak teratur.Masalahjuga timbul bilaperkerasan jalanterendam airbanjir.Rendamanair banjir,menyebabkanmaterial pembentukperkerasan maupuntanah-dasarmenjadi berkurang daya dukungnya.Alternatif solusi perkerasan jalan yang tahan terhadap pengaruh banjir dan beban berlebihan adalah perkerasan jalan dengan Sistem Cakar Ayam Modifikasi dan Sistem Pelat Terpaku.Perkerasan ini, kecuali tahan terhadap pengaruh genanganair banjir,bila digunakan pada tanah-dasar ekspansif, memberikan ketahananjangka panjangdanmenjagakerataan permukaan perkerasan terhadap pengaruh kembang-susut tanah dasar.
ALTERNATIF SOLUSI PEMBANGUNAN PERKERASAN JALAN PADA SUBGRADE BERDAYA DUKUNG RENDAH Hardiyatmo, Hary Christady
INFO-TEKNIK 2016: Prosiding Semnas Teknik Sipil 2016
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v0i0.3042

Abstract

Sistem perkerasan harus dirancang tahan-lama, sehingga tidak mengalami kerusakan prematur akibat pengaruh lingkungan.Perkerasan yang terletakpada tanah-dasar yang teletak padatanahfondasi (timbunan)lunak atau ekspansif, sering mengalami deformasi yang berlebihan oleh beban kendaraan beratmaupunolehpenurunan konsolidasi akibatberat sendiri timbunan.Demikian pula, bila tanah-dasar mengalami gerakan naik turun akibat kembang-susut tanah di bawahnya  oleh berubahnya musim. Akibat kembang-susut tanah- dasar yang tidak seragam, perkerasan menjadi bergelombang tidak teratur.Masalahjuga timbul bilaperkerasan jalanterendam airbanjir.Rendamanair banjir,menyebabkanmaterial pembentukperkerasan maupuntanah-dasarmenjadi berkurang daya dukungnya.Alternatif solusi perkerasan jalan yang tahan terhadap pengaruh banjir dan beban berlebihan adalah perkerasan jalan dengan Sistem Cakar Ayam Modifikasi dan Sistem Pelat Terpaku.Perkerasan ini, kecuali tahan terhadap pengaruh genanganair banjir,bila digunakan pada tanah-dasar ekspansif, memberikan ketahananjangka panjangdanmenjagakerataan permukaan perkerasan terhadap pengaruh kembang-susut tanah dasar.