Study on Temporal and Spatial Evolution and Collaborative Control of Roadway Deformation under Multiple Mining
In order to study the temporal and spatial evolution characteristics of surrounding rock deformation of floor roadway under the influence of multiple mining,the stress distribution characteristics of floor roadway of gangue belt machine in a mining area of Gubei Mine were studied by combining theoretical analysis,numerical simulation and engineering practice,and the spatio-temporal evolution law of surrounding rock elastic plastic zone was analyzed,and a collaborative control scheme was proposed.The results show that multiple mining and the position relationship between roadway and working face are the main factors of severe damage to floor roadway,which is also an important basis for analyzing the spatio-temporal evolution of road-way surrounding rock and selecting collaborative control scheme.In the mining process of adjacent coal seam,the stress of the floor and two sides of the roadway presents a trend of"slow increase-fast increase-stable",and the top and bottom of the road-way and two sides bear a large extrusion pressure,and the mechanical imbalance leads to the instability of the surrounding rock.After the overlying coal seam is mined,the surrounding rock below the goaf above the roof of the roadway is extruded up-ward,which reduces the stress concentration and delays the deformation and failure of the surrounding rock of the roadway to a certain extent.The expansion pattern of the plastic zone is consistent with the stress evolution pattern of the surrounding rock,and the failure of the plastic zone is mainly shear failure,and finally appears as a butterfly plastic zone.According to the char-acteristics of the floor roadway,a collaborative control scheme of"anchor rod+anchor cable+U-shaped shed+shotcrete"is designed.The practical results show that when the working face near the coal seam is 80m away from the roadway,the sur-rounding rock stress enters the stage of rapid development.When the collaborative reinforcement support is carried out,the dis-placement of the top and bottom and the two sides decreases by 40.28%and 36.64%respectively compared with the unrein-forced support section,and the effect is in line with the expectation.The research results provide some guidance for the control of roadway surrounding rock under similar conditions.
multiple miningfloor roadwaysurrounding rock deformationspatial and temporal evolutioncollaborative control