ABSTRACT
Geological mapping and rock mass classification are two main quest in tunnel excavation. Most of tunnel excavation investigation are determined manually by geologist. Geological mapping may be different with each geologist and caused human error. To improvise this existed method, Working Face software is used as method to analyze image. RGB image as input for image analysis. This software can determine the deterioration weathered and crack detection (such as faults, joints and crack) by using an RGB image as input. This method also calculates the percentage of rock weathering grade of tunnel face. The weathering grade is divided into 6 grades and each grade represent by different color. The results are related with JH classification. All data and image for this study are taken from granite rock of Pahang-Selangor Raw Water Transfer Tunnel. Numerical and quantitative analysis are carried out to predict the rock fall of tunnel face excavation. The relationship between percentage of weathering grade, rock fall and JH classification will be discussed in this paper. Results are compared with geological mapping by geologist to determine the effectiveness of this method. The aim of study is to make the process of tunnel excavation investigation much easier for engineering geologist to design tunnel support.
