Abstract:

In order to solve the problems of roof collapse and roof fall accidents caused by untimely support during the mining process of tunnel surrounding rock, a step sliding-type advanced support equipment was proposed, and its reliability was studied using simulation methods. Firstly, the composition and principle of the sliding-type advanced support structure were introduced, and the functional reliability of the support effect was clarified. Then, the overall structural strength of the advanced support equipment in both fully supported and stepping process states was simulated and analyzed to verify the rationality of the design of the advanced support equipment. Finally, modal analysis was conducted on the advanced support equipment using ANSYS Workbench to obtain different vibration mode patterns of the equipment. The results show that the maximum deformation of the advanced support equipment in the fully supported state occurs at the front end of the longitudinal beam (with a value of 22.139 mm); the maximum stress is located at the hinge of the front and rear supporting longitudinal beams (with a value of 205.45 MPa), and the location where the equivalent strain is concentrated is located in the intersection area of the arched crossbeam and the supporting longitudinal beam (with a value of 11.624×10^-4). In the stepping process state, the maximum deformation of the advanced support occurs on the front longitudinal beam of the auxiliary support group (with a value of 13.411 mm); the maximum stress of the support occurs at the hinge of the supporting longitudinal beam and the arched crossbeam (with a value of 187.65 MPa); the maximum displacement of the pushing oil cylinder occurs at the hinge of the piston rod head and the auxiliary support group (with a value of 5.633 2 mm), and the maximum stress occurs at the hinge of the main support group (with a value of 187.65 MPa). The first, second, third, and fourth natural frequencies of the machine are 41.715 2, 44.591, 60.826, and 62.789 Hz, respectively. The deformed parts are located on the front support column and the rear support column of the auxiliary support group.

Key words: roof, advanced support, strength, modal analysis, vibration mode