Abstract
In order to comprehensively analyze the adaptability of four-leg hydraulic support with large mining height under impact dynamic load, this paper adopts HyperMesh software to conduct a flexible pretreatment for the top beam, shield beam, and front and rear rods. The numerical simulation model of four-leg hydraulic support is established with ADAMS, where variable stiffness spring is used to replace columns to simulate their elastic characteristics. Building on analysis of the specific parameters of the support, this paper attempts to study the adaptability of the hydraulic support with impact dynamic load acting on the top beam. Additionally, the impact coefficient I and the excitation coefficient E have been introduced to transform the analysis results and optimize the evaluation method of the response degree of the top beam under impact load. Consequently, the response characteristics of the columns and pins at the hinged joints under various coupling states of the surrounding rock are found. Meanwhile, the paper has made a detailed comparison on the stress state of hydraulic support with different impact loads acting on the top beam. The adaptability change rule of the impact dynamic load under various impact conditions has been explored, which is of great significance to the optimization and strength design of four-leg hydraulic support with large mining height.
Highlights
In recent years, as the one-time fully mechanized mining technology with large mining height gains momentum, the hydraulic support is developing towards larger mining height
Based on the dynamic load model with hydraulic support, Li [19] from CCRI has comprehensively analyzed the impact dynamic load bearing characteristics of hydraulic support. e results indicate that the response characteristics of hydraulic support under dynamic load are greater than that under static load, which provides a theoretical basis for subsequent verification
In order to comprehensively analyze the adaptability of the impact dynamic load at the hinge of the main component of the hydraulic support when the impact load acts on the shield beam under a variety of falling conditions, this section carries out simulation experiments by applying the impact load to the upper surface of the shield beam in the way of taking points at equal spacing. irty loading point positions are taken on the upper surface of the shield beam of the bracket
Summary
As the one-time fully mechanized mining technology with large mining height gains momentum, the hydraulic support is developing towards larger mining height. Us, it is concluded that the study of surrounding rock and hydraulic support as a whole helps to produce coal mine safely and efficiently He [17] from China University of Mining and Technology (Beijing), carrying out theoretical research and simulation research on the supporting capacity of two-column and four-column hydraulic supports, respectively, has pointed out that the bearing area of hydraulic supports cannot fully reflect the bearing characteristics of supports, so it is necessary to establish a spatial model to comprehensively study the law of bearing adaptability of two hydraulic supports with the 8707 working face of Jinhuagong Mine as the test site to ensure the accuracy of theoretical analysis. Based on the dynamic load model with hydraulic support, Li [19] from CCRI has comprehensively analyzed the impact dynamic load bearing characteristics of hydraulic support. e results indicate that the response characteristics of hydraulic support under dynamic load are greater than that under static load, which provides a theoretical basis for subsequent verification
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