Studi Kasus : Karakteristik Batuan Area Break Through Terowongan Pengelak Bendungan Ladongi

  • Bambang Hambar Eko Prasetyo Institut Teknologi Nasional Yogyakarta

Abstract

The characteristic of mica schist rock in the diversion tunnel in the break through zone are composed of quarzite veins that have been crushed into clay-filling material and are arranged in open joints. The presence of water seepage on the roof of the tunnel is also a factor that triggers the collapse during excavation of the evasive tunnel penetration. The focus of the research is on the break through area of Sta 0+167,70 to Sta 0+176,70 of the diversion tunnel Ladongi Dam, about 9 meters long. The diversion tunnel is located in the Mekongga Formation (Pzm) with the main composition being mica schist rock. The purpose of this study was to determine the rock characteristics in the break through area using pore boring and RMR method. The result showed that the break through area is composed of two classes of rock in engineering geology, namely CL-CM and CH. The rock class is CH at the bottom and crown of the tunnel excavation, while the middle is composed by the CL-CM class and locally at the top of the tunnel. From the result of this study, it is possible to assess the characteristics of the rock material making up the break through area.

References

Abdi, dkk. 2018. Investigasi Anatomi Tubuh Longsor dan Kondisi Batuan Terowongan Pengelak pada Proyek Bendungan Ladongi, Kolaka Timur, Sulawesi Tenggara. Seminar Pembangunan dan Pengelolaan Bendungan: Batam

Astawa, Rai Made., dkk. 2014. Mekanika Batuan. ITB: Bandung

Bieniawski, Z.T. 1989. Engineering Rock Mass Classification. John Wiley & Sons: Canada

Pangesti, Dyah Rahayu. 2005. Pedoman Grouting Untuk Bendungan. Direktur Sungai Rawa Waduk Kementerian PUPR: Jakarta

Prasetyo, dkk. 2019. Analisis Stabilitas dan Probabilitas Keruntuhan Lereng Saluran Pengarah Bendungan Ladongi, Kolaka Timur, Sulawesi Tenggara. Seminar Nasional Kebumian Ke-12 Universitas Gadjah Mada: Yogyakarta

Simandjuntak, dkk. 1993. Peta Geologi Lembar Kolaka, Sulawesi. Pusat Penelitian dan Pengembangan Geologi: Bandung

Singh, Bhawani & Goel, R, K. 2011. Engineering Rock Mass Classification. Elsevier: London

Surono. 2013. Geologi Lengan Tenggara Sulawesi. Badan Geologi: Bandung
Published
2022-11-11
How to Cite
Bambang Hambar Eko Prasetyo (2022) “Studi Kasus : Karakteristik Batuan Area Break Through Terowongan Pengelak Bendungan Ladongi”, ReTII, pp. 418 -. Available at: //journal.itny.ac.id/index.php/ReTII/article/view/3673 (Accessed: 22July2024).