Mechanical properties of Singapore rocks filled with expansive materials

• Main Author: Koh, Su Wen
• Other Authors: Wu Wei (CEE)
• Format: Final Year Project
• Language: English
• Published: 2019
• Subjects: DRNTU::Engineering::Environmental engineering
• Online Access: http://hdl.handle.net/10356/77335
• Institution: Nanyang Technological University

This project aims to study the dynamic properties of rocks filled with expensive materials. In this experiment, an expensive cement, Soundless Chemical Demolition Agents (SCDA) is used. Due to the lack of information on rocks filled with SCDA, this project aims to look into the dynamic properties of SCDA filled rocks which are being used to investigate the effectiveness of rock fragmentation using SCDA. This project can be further used as a reference to assess the potential of using SCDA to save cost in rock fracturing works. The experiment in this project was designed to collect data on the dynamic stress –strain response of the rock sample filled with SCDA over time. For this purpose, the granite sample was prepared with a thickness of 20mm. The surface of the granite was smoothed using a surface grinder machine and any imperfect edges were filled with epoxy. A borehole was then drilled on to the centre of the cylindrically shaped sample and filled with SCDA. Split Hopkinson pressure bar (SHPB) test was then performed to capture the dynamic properties. Prior to SHPB test, Digital Image Correlation (DIC) was also used to assess the changes of in-plane deformation and strain measurements of the rock before mechanical testing to determine the time period needed for SCDA to induce a crack on the inner rock surface. In addition, the pattern of rock fragmentation and crack propagation was closely observed and recorded down.