A method for removing material from a rock wall. The method includes moving a cutting edge through the rock wall to create a first slot in the rock wall, moving the cutting edge through the rock wall to create a second slot in the rock wall, the second slot being separated from the first slot by an uncut portion, the uncut portion defining a base surface attached to the wall, cutting a notch into the base surface of the uncut portion, and applying a force on the uncut portion to break the uncut portion away from the wall.

A method for removing material from a rock wall. The method includes moving a cutting edge through the rock wall to create a first slot in the rock wall, moving the cutting edge through the rock wall to create a second slot in the rock wall, the second slot being separated from the first slot by an uncut portion, the uncut portion defining a base surface attached to the wall, cutting a notch into the base surface of the uncut portion, and applying a force on the uncut portion to break the uncut portion away from the wall.

An internal support structure for fuel cells within a work machine having a rear end frame with an exterior frame wall in which the fuel cells are stored is disclosed. The internal support structure may include a radiator support housing, a first pedestal and a second pedestal mounted to and extending upward from the bottom wall. The radiator support housing may be disposed proximate a radiator opening of the exterior frame wall, and the pedestals may be disposed forward of the radiator support housing. A first rail may be mounted to the radiator support housing and the first pedestal, and a second rail may be mounted to the radiator support housing and the second pedestal. The internal support structure and the exterior frame wall may define fuel cell cavities for the fuel cell, and a component cavity from components of the electrical power system of the work machine.

A method for assigning a set of tasks to a plurality of mining machines, said machines being arranged to be driven between positions for performing tasks is provided. The method includes defining a first set of constraints to be fulfilled finding an overall solution fulfilling the first set of constraints by solving each constraint as a sub-problem, a solution to at least one sub-problem being dependent on the solution of at least one other sub-problem; the overall solution fulfilling the first set of constraints being an overall solution where a first of said sub-problems is validated by solutions of others of the sub-problems, and assigning tasks to the machines according to the determined validated overall solution, wherein tasks are arranged to be carried out at least partially overlapping in time by the mining machines.

Methods of hydraulic fracturing a rock mass as part of a method of establishing a block cave mine or extending an existing block cave mine includes (a) drilling a plurality of holes downwardly into the rock mass using drill rig equipment positioned on the ground above a proposed or existing block cave mine; and (b) injecting a hydraulic fracturing fluid into the drilled holes from above-ground hydraulic fracturing equipment and inducing fractures in the rock mass. A hydraulic fracturing equipment installation located above-ground drills a plurality of holes downwardly into the rock mass and injects a hydraulic fracturing fluid into the drilled holes and induces fractures in the rock mass. A non-metallic casing for drilled holes is also disclosed.

Methods of hydraulic fracturing a rock mass as part of a method of establishing a block cave mine or extending an existing block cave mine includes (a) drilling a plurality of holes downwardly into the rock mass using drill rig equipment positioned on the ground above a proposed or existing block cave mine; and (b) injecting a hydraulic fracturing fluid into the drilled holes from above-ground hydraulic fracturing equipment and inducing fractures in the rock mass. A hydraulic fracturing equipment installation located above-ground drills a plurality of holes downwardly into the rock mass and injects a hydraulic fracturing fluid into the drilled holes and induces fractures in the rock mass. A non-metallic casing for drilled holes is also disclosed.

A construction monitoring method and system for a V-shaped column in an underground foundation pit, a terminal and a storage medium can include the following steps: acquiring different stress-related data at a plurality of preset positions of stand columns in real time; and analyzing and judging whether the change rate of the stress-related data exceeds a preset change rate range or not or whether the stress-related data exceeds a preset stress-related data range or not.

A construction monitoring method and system for a V-shaped column in an underground foundation pit, a terminal and a storage medium can include the following steps: acquiring different stress-related data at a plurality of preset positions of stand columns in real time; and analyzing and judging whether the change rate of the stress-related data exceeds a preset change rate range or not or whether the stress-related data exceeds a preset stress-related data range or not.

An apparatus for improving the safety and efficiency of underground mining by issuing intelligent warnings of impending coal or rock dynamic disasters includes at least one coal or rock charge probe adaptable to a coal or rock face and configured to detect charge data generated by coal or rock cracking during a mining process, and a monitoring host electrically connected to the coal or rock charge probe and configured to receive the charge data and issue a warning of an impending coal or rock dynamic disaster when warranted by the charge data. In embodiments, the apparatus includes a plurality of channels, and is non-contacting and/or portable.

An apparatus for improving the safety and efficiency of underground mining by issuing intelligent warnings of impending coal or rock dynamic disasters includes at least one coal or rock charge probe adaptable to a coal or rock face and configured to detect charge data generated by coal or rock cracking during a mining process, and a monitoring host electrically connected to the coal or rock charge probe and configured to receive the charge data and issue a warning of an impending coal or rock dynamic disaster when warranted by the charge data. In embodiments, the apparatus includes a plurality of channels, and is non-contacting and/or portable.