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ITS » Master Theses » Geoteknik S2
Posted by ansi@its.ac.id at 06/11/2014 22:36:07  •  1354 Views


ANALISA KESTABILAN LERENG GALIAN AKIBAT GETARAN DINAMIS PADA DAERAH PENAMBANGAN KAPUR TERBUKA

ANALISA KESTABILAN LERENG GALIAN AKIBAT GETARAN DINAMIS PADA DAERAH PENAMBANGAN KAPUR TERBUKA

Author :
FIRMANSYAH, YERRY KAHADITU ( 3110201004 )




ABSTRAK

Dalam penambangan kapur terbuka khususnya penambangan yang dikelola oleh masyarakat desain lereng dan kestabilannya seringkali tidak dianalisa padahal masalah kestabilan lereng pada suatu tambang terbuka merupakan masalah yang sangat penting karena menyangkut masalah keselamatan manusia peralatan penambangan dan infrastruktur lainnya yang berada disekitar lereng galian. Getaran dinamis dan adanya proses pembasahan di musim penghujan serta pengeringan di musim kemarau pada batuan area penambangan dapat menyebabkan rekahan dan retakan batuan membuka diskontinuitas eksisting pada batuan hingga menyebabkan kelongsoran lereng galian. Lokasi penelitian akan dilakukan di lokasi penambangan batu kapur di Kab. Madura Kab. Gresik dan Kab. Jember. Penelitian meliputi uji pengaruh pembasahan-pengeringan terhadap karakteristik fisis mekanis dan dinamis batuan pengujian Unconfined Compressive Strength Tes Suction Tes Elemen Bender Tes Point Load dan Uji Keausan. Analisa kandungan kimia juga dilakukan pada semua batuan di lokasi studi dimana hasil analisa kimia ini dapat digunakan sebagai gambaran awal kekuatan batuan. Hasil karakteristik fisis mekanis dan dinamik batuan ini akan digunakan untuk analisa kestabilan galian perhitungan angka keamanan dimana dalam analisa ini dilakukan berbagai variasi getaran dinamis beban dinamis kendaraan dan beban dinamis gempa dengan menggunakan bantuan program Plaxis Hasil yang diperoleh menunjukkan bahwa apabila dilihat dari segi kepadatan batuan untuk batuan lokasi Jember lebih padat daripada batuan di lokasi yang lain dan dari segi nilai angka pori batuan Jember lebih kecil daripada batuan Madura dan Gresik. Apabila dilihat dari kandungan kimia kandungan Kalium K Mangaan Mn dan Tembaga Cu hanya dimiliki oleh batuan Jember kemungkinan besar kandungan kimia inilah yang menyebabkan kekuatan batuan Jember paling besar daripada lokasi lainnya. Dari hasil pengujian Bender Element dengan menggunakan alat Dutta dapat disimpulkan bahwa respon dinamik rata-rata batuan Madura Gmaks 3568914 kPa lebih kecil daripada respon dinamik rata-rata batuan Gresik Gmaks 3571471 kPa. Dari hasil pengujian tingkat keausan batuan dengan menggunakan slaking equipment dapat disimpulkan bahwa tingkat keausan rata-rata batuan Madura Medium High Durability lebih tinggi dibandingkan tingkat keausan rata-rata batuan Gresik Medium Durability. Sementara asumsi terhadap beban kendaraan di area penambangan adalah 1232 ton ampitudo yang ditimbulkan sebesar 00011 dan frekuensinya sebesar 10 Hz. Stabilitas galian lokasi penambangan untuk lokasi Gresik kondisi aman dicapai apabila pertambangan setinggi H 10 m maksimal sudut galian adalah 70 dan apabila penambangan setinggi H 20 m maksimal sudut galian adalah 50 dan 30. Untuk lokasi Madura kondisi aman dicapai apabila pertambangan setinggi H 10 m maksimal sudut galian adalah 50 dan apabila pertambangan setinggi H 15 m maksimal sudut galian adalah 30. Untuk lokasi Jember kondisi aman dicapai untuk seluruh kondisi penggalian baik H 5 m s d H 45 m dan sudut galian 30 s d 90. Pengaruh adanya proses pembasahan dan pengeringan berdampak signifikan terhadap parameter tegangan air pori negatif pada batuan namun tidak tidak banyak berpengaruh terhadap parameter fisik dan dinamis pada batuan. Dari hasil pemodelan numerik stabilitas galian akibat kombinasi beban dinamis kendaraan dan beban dinamis gempa dengan menggunakan program bantu Plaxis dapat disimpulkan bahwa tidak terjadi keruntuhan galian penambangan kapur pada tiga lokasi studi yakni Kab. Jember Kab. Gresik dan Kab. Madura untuk tinggi 5 m s d tinggi 20 m dan sudut 50 s d sudut 90


ABSTRACT

In the open pit mine limestone particularly which is managed by the priority design and slope stability is often not analyzed. However the slope stability problem in an open pit mine is a very important issue because it involves risks of humans mining equipment and other infrastructure safety which is located around the quarry slopes. The dynamic vibration and wetting processes in the rainy season and drying processes in the dry season on rock mining area can lead cracks and crevices of rocks. Moreover induce the existing discontinuities in the rock thus causing failure in slope excavation. The location of the study will be conducted at the location of limestone mining in the district Madura Gresik and Jember. The research includes the influence of wetting-drying test on physical mechanical and dynamic characteristics of rock Unconfined Compressive Strength Test Suction Test Bender Element Test Point Load Test and Durability test. The analysis was also conducted for the chemical content of rocks in all study sites where the results of chemical analysis can be used as a preliminary description of the strength of rocks. The results of physical mechanical and dynamic characteristics of rock will be used to analyze the stability of the excavation from safety factor analysis. Furthermore this analysis also uses a variety of dynamic vibration by modeling vehicle dynamic loads and earthquake dynamic load using Plaxis program. The obtained results indicate that when viewed in terms of the rock density the rocks in Jember locations are more solid than the rock at another location. In terms of void ratio the void ratio of rocks in Jember is smaller than in Madura and Gresik. When viewed from the chemical content the content of potassium K manganese Mn and copper Cu is only owned by rock in Jember. Most likely the chemical content causes the strength of rocks in Jember is greater than in other locations. The test results using Bender Element with Dutta equipment conclude that the average dynamic response of rock in Madura Gmaks 3568914 kPa is smaller than the average dynamic response of rock in Gresik Gmaks 3571471 kPa. From the test results by using rock slaking equipment it can be concluded that the slaking intensity of the average rock in Madura Medium High Durability is higher than the average slaking intensity of the rock in Gresik Medium Durability. The vehicles in the mining area itself has a total weight of an average of 1232 tonnes amplitude of 00011 and frequency of 10 Hz. While the calculations results of the excavation stability site in Gresik stable condition is achieved when the mining height is 10 meter maximum excavation angle is 70 when the mining height is 20 meter the maximum excavation angle is 50 and 30. In Madura a stable condition is achieved when the mining height is 10 meter and the maximum angle is 50 when the mining height 15 meter the maximum excavation angle is 30. For the location of Jember stable condition is achieved for all conditions of the excavation for the excavation height is 5 meter until 45 m and excavation angle of 30 until 90. The influence of wetting and drying processes have a significant impact on the parameters of negative pore water pressure in the rock but did not affect the physical and dynamic parameters of the rock. From the results of numerical modeling of the stability of excavation due to a combination of dynamic vehicle load and earthquake dynamic loads by using Plaxis program it can be concluded that there is no collapse of the mining of limestone quarrying in the three study sites Jember Gresik and Madura district for height 5 meter until 20 meter height and angle 50 until angle 90



KeywordsKestabilan lereng; Penambangan terbuka; Beban dinamis;Pembasahan-pengeringan; Angka keamanan; Kab. Madura; Kab. Gresik; Kab.Jember.
 
Subject:  tanah
Contributor
  1. Dr. Ir. Ria Asih Aryani Soemitro, M.Eng
  2. Ir. Moesdarjono S, M.Sc
Date Create: 26/07/2012
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-Master-31003140000594
Collection ID: 31003140000594
Call Number: RTS 624.151 363 Fir a


Source
Master Thesis of Civil engineering RTS 624.151 363 Fir a 2013

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Copyright @2014 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




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  1.  ITS-Master-33374-3110201004-Abstract_id-.pdf - 438 KB
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  3.  ITS-Master-33374-3110201004-Conclusion-.pdf - 1343 KB




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