Engineering geological characteristics based on rock mass rating (RMR) and geological strength index (GSI) in Tunnel Number 1 of the Sigli-Aceh toll road

Jabnes Satria,Nugroho Imam Setiawan,I Gde Budi Indrawan,R Che Omar,E Haryono,J.T Sri Sumantyo,B White,A Cardenas Tristan,R.F Putri,D.R Hizbaron

doi:10.1051/e3sconf/202132501014

Abstract

This paper presents engineering geological investigation results in the form of rock mass characteristics for tunnel number 1 of the Sigli-Aceh toll road. The investigation was carried out through geological mapping, core drill evaluation, and laboratory tests. In this research, the rock mass rating (RMR) and Geological Strength Index (GSI) were applied for the rock mass classifications. The measurement of rock mass quality is then used to determine the excavation method and tunnel support system on the SigliAceh toll road. The results showed that the research location consisted of calcareous sandstone with poor to good-quality (GSI (21.7 - 85.5), RMR (32.0 - 67.6)), and sandstone with good quality (GSI (86.3 - 86.9), RMR (64.0 - 65.0)). The poor quality rock masses were mainly caused by weathering effect. In addition, this research also analyzes the relationship between RMR and GSI based on the type and quality of rocks in the research location so that this correlation can be used in other areas with similar rock type and quality to this research location.

Highlights

Tunnel construction development is the most appropriate alternative to protect the environment and support the principles of sustainable development [1]
While for the lithology, it consists of calcareous sandstone and sandstone (Fig. 2)
Based on the Gamble classification [15], the SDI value

Summary

Introduction

Tunnel construction development is the most appropriate alternative to protect the environment and support the principles of sustainable development [1]. Tunnel construction development with sustainable development is currently being developed in Indonesia through the Ministry of Public Works and Housing (PUPR). Land problems have always been obstacles in development, such as roads, bridges, and other civil constructions. The problem of travel time, geological conditions, and various topographies of Indonesia, such as lowlands, hills, and mountains, is the determining factor for tunnel construction. One of the tunnels to be built is tunnel number one of the Sigli-Aceh toll road. The construction of this tunnel is located in Padang Tiji District, Pidie Regency, Aceh Province (Fig. 1)

Methods

Results

Conclusion