Abstract
In the rock cutting process, conical pick wear is often encountered. In order to restrain this condition, a saw blades and conical pick combined cutting method was put forward. Saw blades were employed to slit the rock for increasing the free surface, and then the conical pick was used to break the rock. To research the cutting performance of the new cutting method, the corresponding experimental device and a three-dimensional finite element model are established. In order to obtain crack propagation and fragment separation and to study the fracture process of the rock plate, a damage constative model and failure mechanism were combined in the numerical model. The mechanical tests were carried out to achieve the mechanical parameters of the rock. To investigate different parameters affecting rock plate cutting performance, experiments with different compressive strengths, physical parameters, and cutting depths were carried out. Moreover, the confining pressures affecting the cutting performance were adopted to simulate deep mining conditions. The experimental results demonstrated that the peak cutting force shows the exponential positive correlation with compressive strength, thickness of the rock plate, and cutting depth of the conical pick, and exhibits the exponential positive correlation with rock plate height and width. Besides, the numerical simulation results show that peak cutting force and confining pressure have a binomial relationship.
Highlights
Roadheader is the common equipment in coal mining
Combined with the engineering practical application, rock cutting using a mechanical tool was the most used, productive, and reliable cutting method when compared with others. e classic theoretical models for predicting rock cutting forces with conical picks were proposed by Evans
E selection of the rock constitutive model has a significant influence on numerical simulation. e rock model chosen for investigation must satisfy the requirements: (a) the main properties of rock material must can be set, (b) the rock model needs to satisfied the visualization of crack generation and fragments separation in the rock cutting process, (c) the visualization of cutting process is owned to element deletion caused by tensile or shear failure of rock elements, the elements of rock model must can be endowed with failure, and (d) at the contact position between the conical pick and
Summary
In order to restrain this condition, a saw blades and conical pick combined cutting method was put forward. In order to obtain crack propagation and fragment separation and to study the fracture process of the rock plate, a damage constative model and failure mechanism were combined in the numerical model. To investigate different parameters affecting rock plate cutting performance, experiments with different compressive strengths, physical parameters, and cutting depths were carried out. The confining pressures affecting the cutting performance were adopted to simulate deep mining conditions. E experimental results demonstrated that the peak cutting force shows the exponential positive correlation with compressive strength, thickness of the rock plate, and cutting depth of the conical pick, and exhibits the exponential positive correlation with rock plate height and width. The numerical simulation results show that peak cutting force and confining pressure have a binomial relationship
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