The influence of thermal impact on the strength of soil freezing on the working bodies of earth-moving machines
Freezing of wet cohesive soil rock on the working bodies of earth-moving machines, which makes it difficult to carry out excavation work in conditions of negative ambient temperature. As practice shows, the most effective method of dealing with soil freezing is the method of thermal exposure. In this paper, a silicone plate heating element is considered, which acts as a heat source in the fight against freezing of soil rock to the surfaces of the working bodies of earth-moving machines. This heating element from a 220V power supply has a number of qualities that contribute to its use on working bodies: tight and complete fit over the entire contact area and uniform heating; light weight and thickness. In the course of the research, on a special experimental shear stand, the soil shear force was determined without thermal exposure, and the forces when using a heating element were determined. Based on the data obtained, a mathematical model has been developed that describes the influence of various (variable) factors on the strength of soil rock freezing to the surface of working bodies. The efficiency of the heater application was determined: the shear force decreased by 1.65…7.0 times.