Finite element analysis and static load experiment design of performance indicator for underground structure under ground impact

To explore the performance of deep underground structures under the shock load and the associated vulnerability index, the paper examines a deep straight wall arch under explosion load and the characteristics of the dynamic response of underground structures. A design calculation model of equivalent static load was proposed. The feasibility of using equivalent dynamic load to predict the structure deformation under the action of static loadsand the stress and damage state was analyzed. The analysis results show that the calculation model of static load can reflect the overall bending and partially damaged deformation state of underground structure under ground impact load, and it is reasonable and effective to take the dome deflection as the performance index parameter for underground structures under ground impact. The static load test scheme of performance index of underground structures under the action of ground impact was studied and designed. The geometric scale is 3 / 10. The structure model is made of micro-concrete with a compressive strength of 40 MPa and HRB400 thin steel wires, and the surrounding rock is simulated by fine concrete with a compressive strength of 20 MPa. Load control was employed in the initial stage of the test, and after the structure yielded, displacement control was used. The upper limit of the bearing capacity, which is about 5 000 kN, is given through numerical calculation. © 2023 Science Press. All rights reserved.