Research On Deformation Characteristics And Supporting Structure Of Soft Rock Tunnel Based On Information Construction

In recent years,with the rapid development of China's transportation development,gradually toward more complicated geological conditions in western mountain area development,engineering problems of tunnel engineering suffered more,the high stress soft rock tunnel large deformation condition in recent years is one of the most difficult problems in tunnel engineering.In this paper,Wei Wu high-speed Muzhailing tunnel 2#incline opening based on the project background,the rock and soil mechanics theory,through the establishment of numerical model for the principle of FLAC3 D software with finite difference method,and the measured data of the method of comparing,characteristics and supporting of soft deformation force the geological conditions of tunnel heights,the specific research contents and results are as follows:(1)The author summarized and analyzed the field measured project of 2# inclined shaft in the Mu Zhai Ling tunnel,it is concluded that the deformation characteristics are large deformation,fast deformation rate and long deformation time.The high ground stress and soft rock are the internal causes,and the disturbance force is the external cause.The connection of the construction process has a great influence on the deformation of the supporting structure and the change of the supporting structure,inverted arch of the tunnel should be closed to the ring in time.(2)The author numerical simulated the different conditions of the dilatancy angle from 0? to 18?(half of the friction angle in the surrounding rock),the deformation of the cavern and the stress of the supporting structure increase with the increase of the dilatancy angle,and it can be in good agreement with the measured data in the field,which proves that the shear bulging angle is one of the important factors affecting the large deformation of the extruded surrounding rock.(3)Confirming each other through constant dilatancy angle and dilatancy angle model two numerical simulation results,the dilatancy angle for the plastic zone of tunnel surrounding rock thickness increased significantly,and that the plastic zone thickness of extrusion rock large deformation increase is closely linked,provides a theoretical basis for the way of supporting the long bolt for control deformation.(4)20m reinforced anchor bolt with tensile strength of 850 MPa,the deformation of the caverns,the stress of the supporting structure and the thickness of the plastic zone have been improved to a certain extent,which proves that the reinforced and lengthening bolt is an effective means to control the large deformation of the soft rock tunnel.(5)It can be found by contrast data.,when the anchor bolt increases from 4m to10 m,the deformation of cavern,the strength of supporting structure and the thickness of plastic zone change most obviously.However,when the bolt increases from 10 m to 20 m,the trend of data change is slowing down.Therefore,from the point of view of technical economy and field construction efficiency,the project proposal for 2# inclined shaft is?25 bolt of 10 m length and tensile strength of 850 MPa.