Hary Christady Hardiyatmo, Hary Christady
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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

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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.