Monitoring rock density
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Of all known methods of monitoring the density of coarse detrital material under field conditions, the most effective is to fill a pit with water, using a polyethylene film.
In determining the density of the rock by this method, the sample volume must be not less than 5dmax, and the polythene film should be 0.15–0.20 mm thick.
The density determined by the film method is somewhat (2%) higher than the actual density at the measurement point. The amount of overestimation can be allowed for by using a conversion coefficient of 0.98.
If the method is used correctly, the maximum error of individual determinations will not exceed 1.5%, the mean value of this error over a large number of determinations is 0.5%.
The recommended pit shape for filling with water by means of polyethylene film is aninverted hexagonal truncated pyramid, with a top diameter of 160 cm and slopes of 1∶0.2. The volume of the pit should be not less than 2 m3.
KeywordsHexagonal Pyramid Measurement Point Power Engineer Renewable Energy Source
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