A heavy haul railway tunnel was not densely filled with grouting due to construction problems.Through experimental research and numerical simulation,mechanical response of the composite structure with or without corrugated steel plate reinforcement under biased load was analyzed in the case of not grouting densely filled.The results show that,with the reinforcement of corrugated steel plates,compared with fully compacted grouting,the bearing capacity of the composite structure with not grouting densely filled in the 30° range of the arch waist and the 30° range of the arch crown decrease by 7%～10%,while the bearing capacity of the composite structure with not grouting densely filled in the 30° range of the arch crown decrease by 12.5%,indicating that not grouting densely filled in the arch crown has the greatest impact on the bearing performance of the composite structure.With the reinforcement of corrugated steel plates,as the grouting area of the arch crown increases,the displacement of the left arch shoulder gradually increases,and attention should be paid to the problem of not grouting densely filled in the arch crown of the composite structure in engineering.The larger the range of not grouting densely filled,the greater the impact on the bearing capacity of the composite structure.
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