PROGRAM FOR CALCULATING DRAGLINE PERFORMANCE IN THE DEVELOPMENT OF FROZEN BLASTED ROCK MASS

Abstract

Yakutsk, e-mail: bsdpsv@mail.ru, mironoff22ykt@mail.ru A program has been developed for calculating the indices of a non-transport complicated excavation scheme. The excavation scheme considered in the article is adapted to the conditions of the permafrost zone and is intended for development of the blasted overburden massif, which is subject to repeated freezing, using the non-transport technology. The blasted rock mass is worked out in layers along the entire length of the excavator block. At the same time, a walking dragline excavator is located on the surface of the block, and moving along the block, sequentially removes the surface layer of the rock. This excavation scheme and the block mining procedure ensure the maximum possible performance of the dragline excavator in conditions of repeated freezing of the blasted rock, since the excavator removes the surface layer that has already undergone some thawing under the influence of solar insolation. To calculate the indicators of this non-transport complicated excavation scheme, the parameters of the excavator entry in the pillar are first entered, then the parameters of drilling and blasting operations are set, which determine the configuration of the breakup of the blasted rock mass, and the model of the dragline excavator is set. To calculate the volume of excavation work, the program provides 4 typical options for the formation of the configuration of the rock breakup of the blown overburden ledge. The effect of secondary freezing on the efficiency of the excavator is taken into account by a special algorithm for calculating the dragline performance, which assumes a separate calculation of the productivity and operating time for each excavator block being worked out. The main input data for calculating the dragline performance are the dimensions of the excavator entry, the thickness of the rock layer removed from the bottom of the excavator for a certain period of time, and the average temperature of the rock in each excavation layer. To calculate the performance of an excavator during the development of each layer, the previously established relationships between the temperature of the rock in the bottom hole and the time of the dragline’s working cycle are used. In connection with the temperature and climatic period of mining, the performance of the excavator, the time for working out each excavation layer, and then the time for working out the