ABSTRACT:

The present work light on a set of tests for the determination of abrasivity, whose results are used for the estimation of tool wear not only in TBM tunneling but also in rock drilling, in the use of road headers, in foundation constructions by pilling, etc. The Cerchar abrasivity test has to be highlighted as a widely used test especially during cost calculation in TBM tunneling. Furthermore the LCPC abrasivity test has become more and more important in rock and soil testing. Even as both tests are partly regulated by standards they are performed in multitude of variations which results in highly differing results and updating of the test recommendations is needed. For the practical use of both abrasivity tests a suggestion of a unique classification scheme has been set by the authors.

1 INTRODUCTION

The abrasivity of rock and even soil is a factor with considerable influence on the wear of tools. Hereby the wear is a question of material consumption and is in addition to the excavation speed an important indicator of rock excavation in tunnelling, underground mining or quarrying. The wear depends on the one hand on the machinery being used for excavation; that are the devices and all tools who have contact to the rock or loosened material. This more geological way of determination is used when the quartz or equivalent quartz content of rock is specified by microscopic examination of a thinsection. Another, more technical way is to determine the abrasivity of rocks by laboratory tests where some kind of model or index test is used. In the following paper the Cerchar abrasivity test as well as the LCPC abrasivity test are explained, some technical issues are commented and a unified classification system for both tests is presented.

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