Jrc vs Shear Strength of Granite
EFFECT OF JOINT ROUGHNESS ON
SHEAR STRENGTH OF JOINT IN GRANITE
Introduction
Shear strength is the extreme shear strength where a material can support before rapture. Based on Lama and Vutukuri (1978)[1], it is one of the critical aspects used for designing purpose. There is no doubt that joint is a main factor that leads to failure in every rocks type including granite. In granite, shear strength is one of the main characteristic that needs to be determined in order to classify its strength and stability The measurement of roughness of joint is known as Joint Roughness Coeffiecient (JRC). JRC is directly proportional towards the roughness of joint. Higher roughness of joint surface means higher value of JRC.
Project Objectives
The aim of this project is as followed:
* To determine the roughness of joint that affects its shear strength.
* To undertake shear test on joint of known JRC
* To relate JRC with shear strength of joint
Methodologies
In this research, the value of JRC will be determined by referring to the surface profile of granite based on a standard diagram introduced by Barton and Choubey (1977)[2]. Apart of using the observation method, JRC is also calculated empirically. As a result, the value of JRC obtained will be related to the shear strength by carrying out the tilt test and Schmidt Hammer while the determination of shear strength is carrying out using direct shear box.
Figure 1: Portable Shear Box Apparatus Model Roctest PHI-10
Result and Achievement
Figure 2 shows the relationship between JRC vs shear strength of granite.
Figure 2: Graph Shear Strength VS JRC
Reference 1. [1] Lama,S. S. and Vutukuri,R. D. (1978). Handbook on Mechanical Properties of Rocks:Testing Techniques and Results. Volume 4 2. [2] Barton, N. and Choubey, V. (1977). The Shear Strength of Rock Joints in Theory and Practice, Rock Mechanics. Vol. 10/1-2. 1-30
SHEAR STRENGTH OF JOINT IN GRANITE
Introduction
Shear strength is the extreme shear strength where a material can support before rapture. Based on Lama and Vutukuri (1978)[1], it is one of the critical aspects used for designing purpose. There is no doubt that joint is a main factor that leads to failure in every rocks type including granite. In granite, shear strength is one of the main characteristic that needs to be determined in order to classify its strength and stability The measurement of roughness of joint is known as Joint Roughness Coeffiecient (JRC). JRC is directly proportional towards the roughness of joint. Higher roughness of joint surface means higher value of JRC.
Project Objectives
The aim of this project is as followed:
* To determine the roughness of joint that affects its shear strength.
* To undertake shear test on joint of known JRC
* To relate JRC with shear strength of joint
Methodologies
In this research, the value of JRC will be determined by referring to the surface profile of granite based on a standard diagram introduced by Barton and Choubey (1977)[2]. Apart of using the observation method, JRC is also calculated empirically. As a result, the value of JRC obtained will be related to the shear strength by carrying out the tilt test and Schmidt Hammer while the determination of shear strength is carrying out using direct shear box.
Figure 1: Portable Shear Box Apparatus Model Roctest PHI-10
Result and Achievement
Figure 2 shows the relationship between JRC vs shear strength of granite.
Figure 2: Graph Shear Strength VS JRC
Reference 1. [1] Lama,S. S. and Vutukuri,R. D. (1978). Handbook on Mechanical Properties of Rocks:Testing Techniques and Results. Volume 4 2. [2] Barton, N. and Choubey, V. (1977). The Shear Strength of Rock Joints in Theory and Practice, Rock Mechanics. Vol. 10/1-2. 1-30