Construction method of impact prevention and shock absorption supporting structure of ingate

Abstract

The invention discloses a construction method of an impact prevention and shock absorption supporting structure of an ingate, and belongs to the technical field of mining shaft building. The construction method comprises the main steps that firstly, after the ingate is formed through excavation, an anchor cable grouting project is implemented to form an anchor cable grouting reinforcement layer; then, a composite foam metal cushioning layer is fastened to a concrete sprayed layer through long iron nails to form a main energy absorption and shock absorption cushioning layer; finally, double layers of steel bars are erected on the outer side of the composite foam metal cushioning layer, and high-tenacity concrete is poured into the composite foam metal cushioning layer to form a high-tenacity steel bar concrete poured layer. Through the combination of the high-tenacity steel bar concrete poured layer, the composite foam metal cushioning layer and the anchor cable grouting reinforcement layer in sequence, the strong-weak-strong supporting structure is formed and can support static loads under high stress as well as resist dynamic loads of stress waves caused by excavation, detonation and the like, and the disasters that due to large deformation caused by highly-concentrated static stress of the ingate and damage caused by dynamic impact loads, surrounding rock is damaged and fractured and a supporting structure is unstable are avoided.

Description

technical field [0001] The invention belongs to the technical field of mining and well construction, and in particular relates to a construction method of a Matoumen anti-shock shock-absorbing support structure, which is suitable for Matoumen support and construction design under complex geological conditions in deep areas. Background technique [0002] As the demand for coal increases and the depth of mining continues to increase, shallow resources are increasingly depleted. my country's mines have entered deep mining one after another, and the geomechanical environment has become more complex. With the increase of mining, engineering disasters are increasing day by day, such as mine rock burst, severe mine pressure, large deformation of roadway surrounding rock, rheology, and rising ground temperature, which pose a huge threat to the safe and efficient mining of deep resources. The Matou Gate is the part connecting the shaft and the roadway at the bottom of the shaft. It i...

AI Technical Summary

Problems solved by technology

Under multiple blasting vibrations, the roadway cannot be stabilized for a long time, the concentrated stress generated by the excavation of the Matoumen is superimposed, the stress state deteriorates, the deformation of the surrounding rock is aggravated, and dynamic disasters are induced, and the rock mass of the project is impacted by ground pressure, etc. Non-linear dynamic phenomenon, causing instability and damage to the support structure system

In the past, under the deep high ground stress and complex geomechanical environment, there are few reports on the support structure of Matoumen to resist the impact of dynamic disasters

[0004] In the prior art, in the reinforcement structure at the Matou Gate, the strength of the support structure is often increased, and the deformation of the support structure and the surrounding rock is not coordinated, and it cannot resist the impact of dynamic loads induced by excavation, blasting, and roof rock fractures. vibration, and the poured concrete has insufficient toughness and poor impact strength, and large-scale spalling of reinforced concrete and exposed steel bars have occurred, which can no longer meet disasters such as large deformation of roadway surrounding rock and dynamic impact in deep high-in-situ stress environments.

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