Assignment 1 Brief CIVE1105 PDF

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Download Assignment 1 Brief CIVE1105 PDF

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CIVE 1105 Rock Mechanics Assignment 1: Rock Point-load Testing (Due date: Monday of Week 6, 5:30pm) This Assignment carries 15% of the total scores for the course. You are asked to determine the rock strength characteristics based on the point load test carried out in the Laboratory. Equipment and testing samples will be provided at RMIT Rock Laboratory, however, you may bring your own rock sample to the lab for testing. Please refer to AS 4133.4.1-2007 regarding sample requirement. Please follow RMIT lab safety regulations (N.B. strictly no sandals in the lab.). Students in groups will carry out the test, but the Assignment Report must be prepared and submitted individually. Tasks: 1) Literature review on point load testing, procedures and interpretation – this shall be a very brief review of the methodology used in Point-Load test for rocks (a quarter to half page is adequate). Australian Standard AS4133 should be referred to. 2) Carrying out ONE test on a given rock sample at RMIT Rock laboratory. - You may bring in your own rock sample for testing. You need to observe the sample requirement given in Australian Standard AS4133.4.1-2007. 3) Reporting: As a consulting engineer, you are reporting on the rock strength characteristics based on visual inspection and the point load test results in accordance with the AS4133.4.1-2007. As a minimum, your report should include: Rock description; Records of the point load test; Interpretation of the point load test; Comments on the rock strength characteristics. Submission: Your Assignment 1 Report submission MUST be in PDF format and submitted online as per instruction below: • Naming Rules: SURNAME+FIRST NAME+ STUDENT NUMBER + ASSIGN1.PDF Example: SMITH_JOHN_S1234567_ASSIGN1.PDF Assignment 1 Report must be submitted to Canvas system.

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Background Information about point load test The Point Load Test is a fast and convenient way to determine the strength and fracture toughness of an ore. The Point Load Index can be used to simultaneously characterise rock for blastability and comminution processes. In a Point Load Test, a sample of rock is mounted between two pointed platens and pressure is applied until failure of the sample occurs. The peak applied load is recorded and used to calculate the Point Load Index. The point load tester consists of a hydraulically powered ram and two pointed platens. One of these platens is stationary while the other is free to move through the application of pressure, delivered via the hydraulically powered ram. The rock specimen to be tested is placed between the two platens and force is applied to the specimen by activation of the hydraulic ram. The force applied to the rock is increased and eventually causes the rock to fail. The peak pressure applied is indicated on a pressure gauge. The force recorded by the instrument to just break the rock (P) is converted to a strength value, equivalent to a 50 mm rock. This produces the so-called Is(50) value or Size-Corrected Point Load Index.

References: AS 4133.4.1-2007 : Methods of testing rocks for engineering purposes - Rock strength tests - Determination of point load strength index Hudson, J.A. and Harrison, J.P. (1997) Engineering rock mechanics: An Introduction to the Principles. Pergamon Pages 178-179....