Graduate Thesis Or Dissertation
 

A manual for plate loading tests performed on rock

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  • Plate loading tests in rock are deceptively simple tests to perform. Consequently, many varieties have been developed in the past 60 years. From each of the varieties various investigators have added their own developments and modifications, some good, and some not so good. The result has been a confusion of claims and counterclaims which has produced a situation concerning the plate loading test similar to the Aesop's fable of the blind man and the elephant. The purpose of this paper is to provide a single reference which presents a suitable method for performing each of the various types of tests and reducing the data therefrom. The advantages and disadvantages of each test are discussed along with practical suggestions to assist the reader in selecting the type of test best suited for application to his problem. All forms of the test dutifully generate numbers; and because rock is not homogeneous, isotropic, elastic or continuous as assumed in theory, the results produced from these numbers can add to the confusion. Most of the confusion can be alleviated by understanding how each of the various boundary conditions affects the results. While it is recognized that actual experience with the tests is the best means of eliminating this confusion, this paper discusses the major boundary conditions, how each tends to influence the test and how the unwanted results of the boundary conditions are best separated from the useful data. The useful product of a plate loading test is generally the modulus of deformation of the tested material, but other parameters may be obtained. The paper closes with a discussion of the other material properties and in situ characteristics which can be produced by proper utilization of test data.
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