Specific Digging Energy as a Measure of Diggability

Performance monitoring of shovels is the common practice for diggability estimation. In this paper, the specific digging energy is proposed for the classification of diggability of rock units as a result of performance monitoring studies. An extensive field research program based on the determination of some rock mass and material properties and the performance monitoring of different type and size of electrical shovels has been undertaken at TKI`s (Turkish Coal Enterprises) surface coal mines. The result of performance monitoring of electrical shovels are evaluated considering the ease of digging and formation characteristics. Among various performance parameters, the specific energy is determined as the most relevant diggability parameter. A diggability classification system supported by 80 different case studies is proposed for electrical shovels; it is based on the specific digging energy. Specific digging energy is also very closely related to rock mass and material properties. Good correlations have been established between specific digging energy and rock mass/material properties, such as seismic velocity, penetration rate, uniaxial compressive strength and tensile strength.


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This paper describes the results of performance monitoring of electrical shovels in terms of depth of cut and blast performance on diggability. A field research programme has been undertaken at four different rock units of surface coal mines, namely Yatağan fresh and weathered marl, Tinaz marl and conglomerate. A performance monitoring system has been developed and utilized for different type and size of power shovels. Three different depth of classes (< 0·4, 04–0·6, 0·6–0·8 meters for unblasted cases) are ...
Citation Formats
C. Karpuz, “Specific Digging Energy as a Measure of Diggability,” presented at the 3rd International Symposium on Mine Planning and Equipment Selection (18 - 20 Ekim 1994), İstanbul, Türkiye, 1994, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/72219.