Deep coal seam roadway side soft coal rock anchor bar and cable supporting rationality evaluation method

Abstract

The invention relates to a deep coal seam roadway side soft coal rock anchor bar and cable supporting rationality evaluation method. The supporting rationality can be evaluated through reflection of a constant speed stage deformation velocity coefficient value. On the basis of determining a constant speed stage deformation velocity reasonable value when the coal rock bearing capacity of different sections is exerted fully, through monitoring of soft coal rock deformation evolution characteristics along with time within a deep coal seam roadway side soft coal rock anchor bar anchorage zone and anchor cable anchorage zone and out of the anchorage zones in engineering, constant speed phase soft coal rock deformation velocity coefficients of the different sections are analyzed and the coefficients are compared with a reasonable value, thereby evaluating the rationality of anchor bar and anchor cable supporting parameters and determining the reasonable supporting parameters. The supporting reasonability can be judged in the early coal rock deformation stage, the supporting parameter adjustment can be carried out timely, and the supporting cost is minimized on the basis of ensuring the safety.

Description

technical field [0001] The invention relates to the field of reasonable support for roadways in deep coal seams, in particular to a method for evaluating the rationality of rock bolt cable support for weak coal and rock at the sides of roadways in deep coal seams. Background technique [0002] More than 70% of the deep roadway is arranged in the coal seam. Since the two sides of the roadway are weak coal rocks, local instability of the side of the roadway is common in the project, resulting in the overall instability of the roadway. Choosing reasonable supports to maintain the deformation stability of weak coal rocks is very effective for deep coal. Sustained mining is critical. Such as figure 1 At present, prestressed anchors are often arranged in the weak coal rock with a certain thickness on the surface of the side of the roadway to form an anchor compression arch, and prestressed anchor cables are arranged within a larger thickness range of the side of the roadway to fo...

AI Technical Summary

Problems solved by technology

Due to the complexity of the occurrence conditions of deep coal seams, it is still difficult to fully quantitatively determine the rationality of the anchor bolts and anchor cable support parameters at the side of roadways in deep coal seams. At present, the weak coal and rock anchors at the side of roadways are mainly selected based on theoretical analysis, numerical simulation and engineering experience. Rod and anchor cable support parameters, it is difficult to achieve the expected effect, and the deformation of the weak coal rock at the side of the deep coal seam roadway after support may still have a tendency of "instability"

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