Study on Bearing Test and Stress Characteristics of Grouting Steel Tube
In order to satisfy the support resistance of roadside support in gob-side entry retaining and the easy operation of construction in coal mine,grouting steel tube was proposed to carry out roadside support,that was,grouting material was used instead of concrete as the filling material of steel pipe.The bearing capacity and stress characteristics of grouting steel tube were studied,and the compression deformation of grouting steel tube was numerically simulated by ABAQUS software.The results show that the grouting material with a water cement ratio of 0.4 injected into a steel pipe with a diameter of 159 mm X 8 mm has a bearing capacity of over 2000 kN,which meets the needs of roadside support in gob-side entry retaining and other engineering projects in coal mine.The loading deformation of the grouting steel tube appears layered folding,and the maximum deformation is in the middle position.The rib plate structure of the upper and lower bearing plates has high bearing capacity,which can effectively protect the upper and lower bearing plates to maintain the stability of the tube.The maximum stress of the short GST specimen is distributed near the loading surface of the tube,but the stress distribution in the middle of the tube is uniform.The bending deformation of the long GST specimen appears in the middle position.In the field application,it should be considered that the bearing capacity will be reduced after the grouting steel tube is lengthened.The stability of the grouting steel tube should be improved by strengthening the middle of the long tube or increasing the diameter of the steel pipe.The research results are of great significance for mastering the bearing capacity of grouting steel tube and the next promotion and application.
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