Akbar, Ahmad D. (2024) Perencanaan Ulang Perkuatan Lereng dengan Implementasi Pendekatan Cracked Soil dan Pertimbangan Efek Pulse Like Ground Motion Pada Gempa (Studi Kasus : Kelongsoran Menara SUTT 150 kV T.56 di Kecamatan Tulakan, Pacitan). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Salah satu tower yang berkontribusi dalam pemenuhan pasokan listrik di Jawa Timur adalah Tower PLN APP Pacitan SUTT 150 kV T.56 di Kecamatan Tulakan, Pacitan. Pada awal bulan Desember 2017, telah terjadi hujan lebat disertai angin kencang yang menyebabkan posisi tower miring dan lereng di sekitar lokasi tower longsor. Berdasarkan hasil borlog, lereng tersebut didominasi oleh lapisan tanah lempung medium - stiff dan batuan endapan lempung. Adanya hujan lebat, walaupun dalam rentang waktu yang pendek, yang mengisi retakan (crack) pada lereng akan dapat menyebabkan pergerakan tanah yang berakibat terjadinya longsoran lereng tersebut. Oleh sebab itu, analisis kestabilan lereng dengan pendekatan theory of cracked soil akan diadopsi pada studi ini. Mempertimbangkan pendekatan ini, longsor dapat terjadi pada hujan lebat hingga sangat lebat dengan angka keamanan berkisar 1 hingga 0,495. Adanya pengaruh gempa tidak dapat diabaikan akibat potensi gempa yang tinggi di Pacitan. Akan tetapi, adanya gempa selama ini menimbulkan pertanyaan mengapa gempa tidak menyebabkan longsor padahal hujan lebat dan retakan telah ada sebelumnya. Kondisi ini berkaitan dengan adanya gempa dengan efek Pulse Like Ground Motion (PLGM). Efek PLGM diperkirakan dapat muncul karena lokasi tower yang berada dekat dengan Patahan Grindulu, Pacitan. Metode analisis yang dapat digunakan untuk menyimulasikan gempa dengan efek PLGM menggunakan metode numerik. Hasil pada simulasi gempa menunjukkan bahwa gempa dengan efek PLGM akan menyebabkan longsor meskipun nilai PGA gempa kecil. Hal ini akibat adanya peningkatan percepatan hingga 4 kali lipat yang linear dengan gaya dorong yang sangat besar. Dengan demikian, adanya kondisi gempa dengan efek PLGM sulit diatasi dengan perkuatan lereng. Pertimbangan perkuatan lereng digunakan untuk mengatasi longsor akibat hujan. Perencanaan ground anchor menghasilkan kebutuhan perkuatan dengan jumlah 32 buah dengan pemasangan 4 – 5 angkur per 2 meter. Angkur yang terpasang memiliki panjang total 16 m hingga 23 m, dengan material strand Grade 270 berjumlah 12 – 15 buah tiap angkur. Fixed anchor yang dapat memenuhi persyaratan perkuatan lereng didesain dengan panjang 8 meter dengan diameter 0,3 meter. Adanya gaya tarik yang besar pada angkur menyebabkan anchor block harus dipasang dengan bored pile yang memiliki panjang 7 meter dan berdiameter 1 meter
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One of the towers that contributes to fulfilling electricity supplies in East Java is the PLN APP Pacitan SUTT 150 kV T.56 Tower in Tulakan District, Pacitan. At the beginning of December 2017, there was heavy rain accompanied by strong winds which caused the tower to tilt and the slopes around the tower location to collapse. Based on the borlog results, the slope is dominated by layers of medium-stiff clay soil and clay sedimentary rock. The presence of heavy rain, even over a short period of time, which fills the cracks on the slopes can cause soil movement which results in landslides on the slopes. Therefore, slope stability analysis using the theory of cracked soil approach will be adopted in this study. Considering this approach, landslides can occur in heavy to very heavy rain with safety figures ranging from 1 to 0.495. The influence of earthquakes cannot be ignored due to the high potential for earthquakes in Pacitan. However, the existence of earthquakes during this time raises the question of why the earthquake did not cause landslides even though heavy rain and cracks had already existed before. This condition is related to an earthquake with a Pulse Like Ground Motion (PLGM) effect. The PLGM effect is expected to arise because the tower's location is close to the Grindulu Fault, Pacitan. The analytical method that can be used to simulate earthquakes with PLGM effects uses numerical methods. The results of the earthquake simulation show that an earthquake with the PLGM effect will cause landslides even though the PGA value of the earthquake is small. This is due to a linear increase in acceleration of up to 4 times with a very large thrust force. Thus, the existence of earthquake conditions with PLGM effects is difficult to overcome by strengthening the slopes. Consideration of slope strengthening is used to overcome landslides caused by rain. The ground anchor planning resulted in the need for 32 reinforcements with the installation of 4 – 5 anchors per 2 meters. The anchors installed have a total length of 16 m to 23 m, with 12 – 15 Grade 270 strand materials per anchor. Fixed anchors that can meet slope strengthening requirements are designed with a length of 8 meters with a diameter of 0.3 meters. The large pulling force on the anchor causes the anchor block to be installed with a bored pile that is 7 meters long and 1 meter in diameter
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Cracked soil, gempa, ground anchor; pulse like ground motion , stabilitas lereng |
| Subjects: | Q Science > QE Geology > QE538.5 Seismic tomography; Seismic waves. Elastic waves Q Science > QE Geology > QE538.8 Earthquakes. Seismology Q Science > QE Geology > QE539.2.S4 Seismic models Q Science > QE Geology > QE599 Landslides. Rockslides Q Science > QE Geology > QE601 Geology, Structural T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22201-(S1) Undergraduate Thesis |
| Depositing User: | Ahmad Dzikrullah Akbar |
| Date Deposited: | 07 Feb 2024 08:46 |
| Last Modified: | 07 Feb 2024 08:46 |
| URI: | http://repository.its.ac.id/id/eprint/106432 |
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