This paper describes instrumental measurement uncertainties and their influence on the result obtained from determination of rock sample uniaxial compressive strength and deformability. The interdependence of uncertainty contribution is analyzed and guides for improving measurement uncertainty are given. The achieved uncertainties are compared to typical uncertainties in the determination of concrete and metallic material compressive strength and deformability.
Speci c energy is the measure which connects the operating parameters of a machine with the characteristics of the rock in which the machine works and is equal to the total work required to break a unit volume of the rock. It is assumed that in machines with the same or similar rock breaking mechanics used for di erent purposes (e.g. cutting and drilling of rocks), there is a signi cant dependence on their speci c energy values. In the exploitation of dimension stone a chain saw and a rotary drill are often used, i.e. the machines for rock cutting or rock drilling whereas their mechanics of rock breaking are very similar. In order to determine the dependence of the speci c energy of rock cutting on the speci c drilling energy, preliminary laboratory tests were carried out on a linear cutting machine and a laboratory drilling rig with simulated cutting of rocks with a chain saw, and drilling by rotary drilling rig. The analysis of the measurement results has provided the guidelines for the continuation of laboratory testing, i.e. eld testing.
Vibrating wire sensors are usedfor strain measurement. Sensing is based infrequency change when tension ofwire changes.Here are considered other possibilities of vibrating wire strain gauge implementations and their properties. It includes change in frequency with change in length and some implementations with sliding contact. Last implementation consists offirm beam and short segment of wire which allows better sensitivity of sensor giving substantially larger increase of frequency for small increase in strain.signal. Frequency can be transmitted over long distances without distortions. Thermal voltages and voltage drop do not influence frequency and hence information in the measured signal.
II. THEORYA. Implementation 1 and 2
This paper presents the virtual instrument for measurement and determination of uniaxial compression strength and rock sample deformability. It analyzes properties and limitations of several implemented virtual instruments. Furthermore, comparison of implemented virtual instrument properties is presented.
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