Study on Mechanical Response Rule and Control Effect of Abandoned Roadway Filling in Remining Face
In view of the stress problem of surrounding rock in overopening of residual coal remining roadway,taking the roadway layout of remining face in a mine industry as the engineering background,the finite element model is established ac-cording to the test results of mechanical properties of backfill and surrounding rock in laboratory,the distribution and evolution law of the maximum stress、stress concentration aera in the surrounding rock and coal pillar of abandoned roadway are studied,when the stoping process of remining face without filling and filling with different materials.The results show that the maximum stress in coal pillar decreases from 26.5 MPa to 14.8 MPa,the maximum stress region decreases from 6 773 mm2 to 2 619 mm2 when the coal pillar is close to the working face,which indicates that the filling roadway provides lateral constraints to the coal pillar and the destruction range of the coal pillar is greatly reduced.When using finite element to simulate the filling mate-rials with elastic modulus of 27、115、208 MPa,the maximum vertical stress of surrounding rock is 14.80、14.23、13.43 MPa,the results show that the filling material with good mechanical properties is helpful to improve the stress distribution.On the ba-sis of numerical simulation,the in-situ monitoring of the mine pressure development of the filling roadway with elastic modulus 208 MPa material is carried out.Compared with that before filling mining,the working resistance of the support is reduced from 1 708.1～1 859.67 kN to 776.18～815.13 kN,the decrease is more obvious,and the stability of the overlying roof can be en-sured.
stress distribution in abandoned roadwayfilling materialremining facenumerical simulationmine pressure monitoring
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