SLOPE STABILITY ANALYSIS DUE TO INFRASTRUCTURE DEVELOPMENT OF RATU BOKO SITE YOGYAKARTA UNDER EARTHQUAKES LOADING

  • Ahmad Rifa'i Gadjah Mada University, Department of Civil and Environmental Engineering, Indonesia
  • Okri Asfino Putra Padang Institute of Technology, Department of Civil Engineering, Indonesia
Keywords: Yogyakarta, Indonesia, reinforcement, slope stability, safety factor

Abstract


The Ratu Boko site is a cultural heritage that has a high historical value and located about 30 kilometers to the east of Yogyakarta. Instability of the slope occurred due to the Yogyakarta earthquake in 2006, and it was indicated by the occurrence of cracks in the resto building that built on the top of the hill. The first reinforcement of the columns and foundations of the outside building was used a reinforced concrete that built-in 2012. The similar reinforcement on the inside building column and foundation was finished in 2017. In this research the displacement of the reinforced foundation, and slope stability generally both in safety factor and deformation were evaluated. The deformation and displacement analysis of the foundation were solved using Finite Element Analysis. On the other hand, for the safety factor of the slope, Limit Equilibrium Method was used. The simulation is divided into several stages, starting from the existing condition, after the first and second reinforcement, and also after increasing load due to development plan. Based on the numerical simulation, the horizontal displacement on the foundation of Plaza Andrawina decreases after the first and second reinforcement was installed. The horizontal displacement is significantly decreased in both foundations for 9.44 mm and 8.03 mm. Furthermore, the safety factor of the slope increases after the first and second reinforcement was installed. The slope safety factor using a maximum acceleration of 0.30g is 1.318. These obtained results are relatively safe from slope failures

References

1. Rifa’i, A., Lestari, N. P., & Yasufuku, N. (2016). Drainage System of Prambanan Temple Yard Using Nofine Concrete of Volcanic Ash and Bantak Merapi. International Journal of Geomate, 11(25), 2499-2505.
2. Rifa’i, A., & Yasufuku, N. (2017). Utilization of Bantak and Merapi Volcanic Ash for Porous Paving Block as Drainage Control in the Prambanan Temple Yard. International Journal of Geomate, 12(31), 141-146.
3. Sarita, U. 2013. Evaluasi Stabilitas Lereng Ratu Boko Berdasarkan Simulasi Numeris . Yogyakarta: Jurusan Teknik Sipil dan Lingkungan, Fakultas Teknik, Universitas Gadjah Mada. In Indonesian Language
4. Hardiyatmo, H. C. 2012. Tanah Longsor dan Erosi. Yogyakarta: Gadjah Mada University Press. In Indonesian Language
5. Lin. H, Zhong. W, Xiong. W, and Tang. W. (2014). Slope Stability Analysis Using Limit Equilibrium Method in Nonlinear Criterion. The scientific world journal.
6. Liu. S.Y, Shao. L.T, and Li. H.J. (2014). Slope stability analysis using the limit equilibrium method and two finite element methods. Computers and Geotechnic, 63, 291-298.
7. Putra, O. A., Yasufuku, N., Ishikura, R., Alowaisy, A., Kawaguchi, Y., (2019). Mechanical Behaviour of Unsaturated Undisturbed Black Volcanic Ash Soil Under Static And Cyclic Loading. Proc. 7th International Symposium on Deformation Characteristics of Geomaterials (IS-Glasgow 2019)
8. Putra, O. A., Yasufuku, N., Ishikura, R., Rifa’i, A., Alowaisy, A., Kawaguchi, Y., (2019). Effect of Soil Structure Disturbance on the Shear Strength of Black Volcanic Ash Soil. Proc. International Conference on Earthquake Engineering and Disaster Mitigation (ICEEDM 2019)
9. Putra, O. A., Yasufuku, N., Alowaisy, A., Ishikura, R., Rifa’i, A., Kawaguchi, Y., (2019). Shear Strength Characteristics of Unsaturated Undisturbed Black Volcanic Ash Soil in Kumamoto under Static and Cyclic Loading. Lowland Technology International Journal, 22(2), 280-289.
10. Hoek, E., Torres, C. C., & Corkum, B. 2002. Hoek Brown Failure Criterion - 2002 Edition. Toronto: Rocscience Inc.
11. Das, B. M. 2010. Principles of Geotechnical Engineering. 7th edition. Boston: PWS Publishing.
12. Trisani, F. 2015. Stabilitas Lereng Ratu Boko Akibat Pengembangan Infrastruktur Berdasarkan Simulasi Numeris . Yogyakarta: Jurusan Teknik Sipil dan Lingkungan, Fakultas Teknik, Universitas Gadjah Mada. In Indonesian Language
13. Amalia, N. 2015. Analisis Stabilitas Lereng Kawasan Situs Ratu Boko Akibat Tambahan Beban Bangunan dan Pengaruh Perubahan Kadar Air. Yogyakarta: Jurusan Teknik Sipil dan Lingkungan, Fakultas Teknik, Universitas Gadjah Mada. In Indonesian Language
14. Hidayat, N. 2015. Geotechnical Aspects Assessment of Slope Failure Hazard and Infrastructure Development Plan at Development Area of Ratu Boko Sites. Yogyakarta: Department of Civil Engineering, Engineering Faculty, Gadjah Mada University.
15. Putra. O.A. (2017) Analisis Stabilitas Lereng Tanah Di Atas Batuan Breksi Pada Pengembangan Infrastruktur Situs Ratu Boko Yogyakarta, Tesis, Jurusan Teknik Sipil dan Lingkungan, Fakultas Teknik, Universitas Gadjah Mada. In Indonesian Language
16. Waruwu, A., Hardiyatmo, H. C., & Rifa’i, A. (2017). Deflection Behavior of the Nailed Slab System Supported Embankment on Peat Soil. Journal of Applied Engineering Science, 15(4), 556-563.
17. Slope/W manual verison 2007. (2007). GEO-SLOPE International Ltd, Canada.
18. Brinkgreeve. R.B.J, Engin, E, Swolfs, W.M. (2012). Plaxis 2D version 2012 manual, Delf, Netherlands
Published
2021/08/17
Section
Original Scientific Paper