| As the starting point for coal mining face mining,cutting lane is mainly used to install mining related equipment and is an important place for coal mining.The installation of the relevant equipment at the working face and the mining of the working face require relatively stable conditions for cutting the surrounding rock.Therefore,the reasonable and effective control technology for cutting the surrounding rock has the advantages of ensuring the production safety of the working face,improving the working efficiency,and reducing the support cost important meaning.However,cutting roadway is different from the general coal roadway.Its span and width-height ratio are much larger,and the width of cutting roadway becomes the main controlling factor affecting the stability of its surrounding rock.On the other hand,most of the cut roadways in the working face of thick coal seam are designed at the bottom of the coal seam.Both sides of the roadway and roof are coal bodies.The mechanical properties of the surrounding rock are poor,the original cracks are more developed,and the stress environment is complex.Large deformation and damage range.The above situation has a direct impact on the stability of such roadways,and the support is more difficult.Therefore,the research on the control technology of surrounding rock in large-span cutting roads has attracted more and more attention,and has become an urgent technical problem to be solved in coal mining.This article takes the 1012001 fully mechanized caving face of Yuanzigou Coal Mine as the research object.Its cutting roadway is digging along 2 coal floors.The designed cross-sectional size is 9600 mm high and 3950 mm wide.The cross-sectional size and span are large,the top coal is thick,and the same layer During the driving process of the working face along the groove,serious problems such as gangway ganging and severe roof sinking are exposed,which threatens the construction of the working face and the safety of personnel.If the original tunnel support concept is still used,problems such as roof sinking and bulging of the gangway will definitely occur during the roadway excavation,which will affect the normal installation of the equipment and the mine succession plan.Through numerical simulation analysis,the combined support of bolts and cables can effectively increase the stability of the cut surrounding rock: the bolt is used to strengthen the shallow rock mass of the surrounding rock,so as to bear the force exerted by the shallow surrounding rock and reduce the surrounding rockDeformation,the anchor cable passes through the combined structure of the anchor and anchor in the shallow rock mass of the surrounding rock,thereby fixing the arch in the deep rock mass,and taking advantage of the stability of the deep rock mass,changing the "support" to "pull",Through this method,a multi-layer protective support system is formed in the surrounding rock to achieve the purpose of increasing the stability of the shallow rock mass of the surrounding rock,so that the shallow rock mass of the surrounding rock serves as a very critical part of the supporting system To increase the stability of surrounding rock.Based on the suspension theory and composite beam theory of bolt support,the roof control technology based on truss anchor cable is proposed to determine the surrounding rock support scheme and support parameters for cutting roadway.In order to objectively evaluate the stability control effect of the cut rock surrounding rock,the rock pressure of the cut rock surrounding rock was observed.The results show that the roof separation of the cut roadway is small,which is a stable and constant type of separation;the deformation and deformation speed of the surrounding rock are within a reasonable range;the anchoring effect of the anchor rod(cable)is good,and the stability of the surrounding rock after supporting Stronger,large-span cutting lanes are better controlled.The paper consists of 41 figures,12 tables,and 63 references. |
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