Analysis Of Mechanical Characteristics Of Pipe Way In Connecting Chambers Based On Stepped Excavation Effect

There are some serious deformation and damage in the deep shaft connecting chambers,in addition to the large pressure,groundwater seepage,the poor lithology and other reasons,and the dense arrangement of the various functional structures in the chamber group,and also have a great influence on each other.The three-dimensional cross chamber of the complex structure of the group,in the excavation process,the dynamic load generated great room for surrounding rock will ingate and tunnel adjacent wall,and the supporting structure,and the deformation of excavation disturbance and unloading rock,extremely easy to cause the chamber ingate and related chamber wall,instability and adjacent failure is a serious threat to the safety production of coal mine.Therefore,it is important to study the structure and construction process of pipe way in the deep shaft connecting chambers.This paper takes Zhangji mine deep shaft connecting chambers structure as the research background,based on the caverns excavation chambers construction theory,mechanical principle,the pipe way structure of connecting chambers as the research object,through the analysis of the stress and deformation characteristics,and by using the numerical simulation software ABAQUS is used to simulate the excavation of caverns,distribution and displacement distribution of stress of surrounding rock of caverns connected.Obtain:(1)Horsehead roadway and pipe way excavated,occurrence of superimposed stress release area,The stress on the top of the pipe roof is larger,up to 39.3MPa,horizontal displacement and pipe in the construction process of road roof and side wall of the upper part of the vertical displacement is larger.(2)The middle area of the pipe and horsehead road of stress concentration is obvious,outer side of the middle pipe and shaft ingate area,10 meters and ingate roof and floor outside the 11 meters formation stress release area.(3)In the position of 3m or so below the bottom of the pipe wall,the vertical displacement of the shaft wall is changed,and the displacement is upward and the displacement is downward under the catastrophe point.In the actual construction process,the thickness of the wall should be strengthened,or other effective measures should be taken to prevent the damage of the shaft lining.