STUDI PERBANDINGAN KLASIFIKASI MASSA BATUAN RMR, INDEKS Q, DAN GSI DALAM ANALISIS KESTABILAN TEROWONGAN JALAN TOL CISUMDAWU, KABUPATEN SUMEDANG, JAWA BARAT

• Main Author: Wiria Swana, Galih
• Format: Theses
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/34387
• Institution: Institut Teknologi Bandung

In the planning for engineering works, particularly related to the tunnel construction, heterogeneity and discontinuity of rock mass are often become an obstacle. One of the ways to anticipate the foremetioned obstacle is by applying rock mass classification. In General, there are a variety of empirical methods in rock mass classification, which the three methods quite popular in Indonesia are Rock Mass Classification (RMR), Q index, and Geological Strength Index (GSI). This research will discuss a comparison of the three methods of rock mass classification with the main objective is to assess the most suitable method applied in Cisumdawu highway tunnel plan areas. The tunnel plan is located at the Pamulihan Village, Tanjung Sari District, Sumedang town, West Java Province, and is composed by undifferentiated young volcanic products (Qyu) situated on the steep volcanic hills geomorphology unit. There are four groups of the rock mass along the tunnel plan, which are massive lapilli tuff-tuff, tuff with igneous rocks infilling, lapilli tuff-tuff with the contact area, and lapilli tuff-tuff with small cracks. Results of rock mass classification analysis of rock mass along the tunnel plan shows that, RMR value range between 20 to 31 (poor to very poor grade ), Q index values range from 0.0125 to 0.06 (extremely poor rock mass), and GSI, value range from 11 to 25 (disintegrated rock mass). Based on these results, the mechanical properties of rock mass and the type of reinforcement have been obtained and in turn it has been used as the basis for the tunnel stability analysis. Results of this tunnel stability analysis showed that the GSI classification has the most suitable result applied for Cisumdawu highway tunnel plan comparing to both other rock mass classification.