THE ANALYSIS OF LIQUEFACTION PHENOMENON OF THE FLEXIBLE PAVEMENT USING SEISMIC MONITORING EQUIPMENT

ABSTRACT: Liquefaction phenomenon is generally caused by high dynamic vibrations in a very fast duration. This article investigated the behavior of dynamic vibrations caused by vehicles on the road. This study employed the HVSR (Horizontal Vertical Spectral Ratio) with an accelerometer. The result of dynamic vibration generated by the passing vehicle or the micro tremor / micro seismic vibration was recorded by seismic monitoring devices. This seismic monitoring equipment converted vibration into natural frequency (f0) and amplification (A0) using Geopsy software. The result of HVSR (Horizontal Vertical Spectral Ratio) was the soil vulnerability index (Kg). The results of this study indicated that the three parameters above were then analyzed with the assumption that if the amplification value (A0) was higher and associated with a lower natural frequency value (Æ’0) with a high vulnerability index (Kg), then the area had the potential liquefaction, with laboratory research results in the form of granular gradation testing as the supporting data. Therefore, the results of the analysis and the laboratory can concluded that the three research locations have the potential liquefaction. ABSTRAK: Fenomena pececairan umumnya disebabkan oleh adanya getaran dinamik tinggi dalam tempoh yang sangat cepat. Artikel ini mengkaji fenomena getaran dinamik yang disebabkan oleh kenderaan di jalan raya. Kajian ini menggunakan HVSR (Nisbah Spektral Menegak Mendatar) dengan pecutan. Hasil getaran dinamik yang dihasilkan oleh kenderaan yang melalui atau gegaran mikro / mikro getaran seismik dicatatkan oleh alat pemantauan seismik. Peralatan pemantauan seismik ini mengubah getaran ke frekuensi semula jadi (f0) dan amplifikasi (A0) menggunakan perisian Geopsy. Hasil HVSR (Nisbah Spektral Vertikal Mendatar) adalah indeks kelemahan tanah (Kg). Keputusan kajian ini menunjukkan bahawa ketiga-tiga parameter di atas kemudian dianalisis dengan anggapan bahawa jika nilai amplifikasi (A0) lebih tinggi dan dikaitkan dengan nilai kekerapan semulajadi yang lebih rendah (Æ’0) dengan indeks kelemahan tinggi (Kg), maka kawasan mempunyai potensi pencairan, dengan hasil penyelidikan makmal berupa pengujian gradasi granular sebagai data pendukung. Oleh itu, hasil analisis dan makmal dapat menyimpulkan bahawa tiga lokasi penyelidikan mempunyai potensi adanya pececairan.

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Experimental Research on Dynamic Characteristics of a Rolling Agricultural Tire (Influence of Running Condition)

Volume 4B: Dynamics, Vibration and Control ◽

10.1115/imece2013-62736 ◽

2013 ◽

Author(s):

Katsuhide Fujita ◽

Takashi Saito ◽

Mitsugu Kaneko

Keyword(s):

Natural Frequency ◽

Dynamic Behavior ◽

Experimental Research ◽

Dynamic Characteristics ◽

Excitation Frequency ◽

Road Surface ◽

Natural Mode ◽

The Road ◽

On The Road ◽

Agricultural Machines

When agricultural machines are operated on pavements, the vibration and noise caused by the interaction between the tire lugs and the road surface are inevitable. In conventional studies, it is considered that the dynamic behavior of a rolling agricultural tire is influenced by the vibration characteristics of the tire. Resonance occurs when the lug excitation frequency of the tire, which is defined as the lug number multiplied by the number of revolutions of the tire, becomes equal to the natural frequency of the tire. In other words, the rolling tire shows large vibrations in the direction of the natural mode corresponding to the natural frequency of the tire. However, in the conventional equipment, the diameter of the drum is smaller than that of the tire. Therefore, the real running condition on the road was not realized by the rolling test using the conventional equipment. In this study, a new equipment is produced to realize the running condition in the rolling test. The dynamic and vibratory characteristics of operating agricultural machine are investigated by using this new equipment. The obtained results are compared to the conventional ones and the influence of the running condition on dynamic characteristics of rolling tire is investigated.

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EVALUASI KEBUTUHAN RAMBU LALU LINTAS PADA RUAS JALAN PERBATASAN ANTARA KABUPATEN BANTUL-GADING DI GUNUNGKIDUL, YOGYAKARTA

Jurnal Penelitian Transportasi Darat ◽

10.25104/jptd.v18i1.107 ◽

2017 ◽

Vol 18 (1) ◽

pp. 1

Author(s):

Setio Boedi Arianto ◽

Dwi Heriwibowo

Keyword(s):

Traffic Engineering ◽

Road Traffic ◽

Warning Signs ◽

Border Crossing ◽

Qualitative And Quantitative Analysis ◽

Traffic Signs ◽

Qualitative And Quantitative ◽

The Road ◽

On The Road ◽

Monitoring Devices

ABSTRACTThe purpose of this research is to find out the number of road traffic facilities requirement as monitoring devices toward the implementation of management and traffic engineering in order to support safety road. The analytical method used are Descriptive Qualitative and Quantitative analysis. The conclusions of this study are the characteristics of road geometric in Gunungkidul Regency on the road border crossing between Bantul Regency and Gading Regency mostly are uphill and downhill road combined with curves roadside segmented which are indicates accidents-prone areas. Therefore it is required some of traffic signs for this segment about 128 units which are consisting of order signs 2 units, instruction signs 13 units, warning signs 108 units, and prohibition signs 5 units. Currently the number of traffic signs installed are 76 units consisting of order signs 2 units, signs instruction 4 units, warning signs 67 units, and prohibition signs 3 units, for this there are a shortage of traffic signs for 52 units consisting of signs instruction 9 units, warning signs 41 units, and prohibition signs 2 units.ABSTRAKTujuan melakukan penelitian adalah untuk mengetahui jumlah kebutuhan perlengkapan jalan sebagai alat pengawasan terhadap pelaksanaan manajemen dan rekayasa lalu lintas dalam rangka keselamatan jalan. Metode analisis yang digunakan adalah analisis deskriptif kualitatif dan kuantitatif. Kesimpulan dari penelitian ini adalah kondisi geometri jalan di Kabupaten Gunungkidul pada ruas jalan batas Kabupaten Bantul-Gading, yaitu berupa tanjakan dan turunan serta tikungan tajam dan segmen jalan ini merupakan daerah rawan kecelakaan. Karenanya dibutuhkan rambu-rambu lalu lintas pada segmen jalan ini sebanyak 128 unit terdiri atas rambu perintah 2 unit, rambu petunjuk 13 unit, rambu peringatan 108 unit, dan rambu larangan 5 unit. Untuk saat ini jumlah rambu lalu lintas terpasang adalah 76 unit yang terdiri atas rambu perintah 2 unit, rambu petunjuk 4 unit, rambu peringatan 67 unit, dan rambu larangan 3 unit, sehingga terdapat kekurangan jumlah rambu 52 unit yang terdiri atas rambu petunjuk 9 unit, rambu peringatan 41 unit, dan rambu larangan 2 unit.

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Local Site Effects Evaluation Using Microtremor Measurements at North Side of Pandan Mountain

Journal of Physics Theories and Applications ◽

10.20961/jphystheor-appl.v1i2.19120 ◽

2017 ◽

Vol 1 (2) ◽

pp. 89 ◽

Cited By ~ 3

Author(s):

Samsul Hidayat ◽

Dwa Desa Warnana ◽

Sorja Koesuma ◽

C Cari

Keyword(s):

Natural Frequency ◽

Amplification Factor ◽

Spectral Ratio ◽

Vulnerability Index ◽

Disaster Mitigation ◽

Residential Areas ◽

Weak Zone ◽

Local Site ◽

Index Value ◽

The Impact

Disaster mitigation has been undertaken to reduce the impact of loss or damage caused by the earthquake. For disaster mitigation purpose, it is necessary to conduct a local geological assessment. The horizontal to vertical spectral ratio (HVSR) of microtremor analysis is very popular in the context of seismic micro-zonation. Microtremor method is cheap, data acquisition is easy, and does not cause noise, so suitable for use in residential areas. This research aims to determine the distribution of the natural frequency value, the amplification factor value, and the soil vulnerability index value. This study was conducted geographically between 7°26'17.45" – 7°26'53.16" S and 111°47'14.76" – 111°48'7.06" E. Data processing using HVSR analysis method on Easy HVSR software. The results showed that the natural frequency (<em>f<sub>o</sub></em>) values range 0,95 Hz to 8,3 Hz and the amplification factor values range 2,05 to 8,67. From the result data of the natural frequency and the amplification factor, the soil vulnerability index can be calculated. The vulnerability index (Kg) value ranges from 1,09 to 68,33. The northeast side of the study area is indicated as a weak zone where have high potential to damage when the earthquake occurred.

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