Fundamental Theroy and Experimental Research

Mechanical analysis of surrounding rock reinforced by prestressed bolt with subsection anchor

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  • 1. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, Shandong 266590, China; 2. College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China

Received date: 2017-01-17

  Online published: 2018-06-05

Supported by

This work was supported by the State Key Research Development Program of China (2016YFC0801403) and the National Natural Science Foundation of China (51374140, 51204102).

Abstract

In this study, a model for a pre-stressed bolt with two anchorage segments was established, by considering both the superiority of point-anchoring bolts and the laws of destruction partitioning and gradually destructive depth development. The model is basically used to solve the following problems. When lengthening-anchoring or fully-anchoring bolts were applied in the deep roadway, the anchorage segments of the anchor was not as uniform as the whole, and the shear capacity was low. While point-anchoring bolts could not adapt to the large deformation. Afterwards the stress characteristics and bearing capacity of two anchorage segments were studied using theoretical calculations and numerical simulations. Moreover, a comparative analysis was also provided in this study. The results show that the bolt with two anchorage segments obviously changes the shear stress curve of the lengthening-anchoring or fully-anchoring bolts, which turns the trend of the original negative exponent into the gentle. Its shear bearing capacity is also improved by the partition supporting pattern with two anchorage segments. Under the conditions of the same pre-stressed force, the load and shear stress of the anchoring section are obviously lower than that of point-anchoring bolts. Under different pre-stressed conditions, these two anchorage sections are separately used as the supporting function of point-anchoring bolts according to various periods of surrounding rock deformation, which continues to show the superiority of point-anchoring bolts.

Cite this article

GU Shi-tan, HU Cheng-cheng, DAI Hua-bin , YAN Chao-chao, . Mechanical analysis of surrounding rock reinforced by prestressed bolt with subsection anchor[J]. Rock and Soil Mechanics, 2017 , 38(10) : 2826 -2832 . DOI: 10.16285/j.rsm.2017.10.007

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