Research On Mechanism And Treatment Scheme Of Large Deformation And Floor Heave Of Dynamic Pressure Roadway In Gequan Colliery

The lithological characteristics of the roof and floor of the main roadway in the west wing of Gequan Mine are dominated by soft and broken surrounding rocks such as mudstone.Under the influence of working face mining disturbance,different degrees of deformation and failure have occurred.The bottom plate and the two sides have a dynamic pressure manifestation characterized by roof subsidence and roadway floor heave as the main deformation characteristics.The main conclusions obtained in this paper using theoretical analysis,numerical simulation,site survey,and industrial test are as follows:1.The actual geological conditions on site were measured,and the reasons for roadway deformation and failure were analyzed.The main factors for roadway failure were: imperfect support technology,mining influence on both sides of the working face,and poor surrounding rock conditions.2.The factors of the floor heave of the on-site roadway were studied,and four roadway support schemes were proposed: "bolt and grouting support","pressure relief groove + grouting bolt","reverse bottom arch + bottom plate" "Anchor cable","original support".The "pressure relief groove + grouting bolt" support scheme has obvious control effects on the roadway floor,but it has a destructive effect on the roof and two sides,and the control effect on the floor is limited in time.As time goes by,the surrounding rock of the roadway The occurrence of rheology will cause the bottom heave phenomenon to appear again in the roadway.3.The grouting bolt has limited restraint on the floor,and does not really improve the stress environment of the floor surrounding rock.In addition,under the action of high level of stress,the roadway surrounding rock continues to be damaged.The "inverted arch + floor anchor cable" support scheme has better effects on the deformation of the surrounding rock of the roadway and the overall control effect of the roadway.Although the stress concentration area under this scheme is closer to the position of the roadway,the degree of stress concentration is greatly reduced,and the impact on the roadway is greatly reduced.The rock control effect is relatively stable.Considering comprehensively,the “reverse bottom arch + bottom plate anchor cable”is used to control the bottom plate.4.The roadway repair plan is a joint support plan of full-face grouting with bolt and cable support and bottom arch of the bottom plate.The repair process is to expand the bank first and then undercover.Specifically,it is two banks of brush expansion ?two banks of support ? pull bottom ?Grouting?Two-side concrete pouring?Laying bottom beam?Installing I-beam and back plate on the top plate?Filling the bottom plate and laying bricks.5.After restoration,monitor the displacement of surrounding rock and the force of anchor rods and cables.The results show that the deformation of the roadway is small,the force of the anchor rod and anchor cable is stable,and the anchor rod cable has a good reinforcement effect.It turns out that the scheme can maintain the stability of the roadway better.There are 67 pictures,2 tables and 61 references in this article.