The Supporting Technology Research in Large Section Inclined Shaft with Fracture and Soft Surrounding Rock
Peng Wen-qing*, a, b, Wang Xin-mina, Wang Wei-junb
Identifiers and Pagination:Year: 2015
First Page: 450
Last Page: 456
Publisher Id: TOCIEJ-9-450
Article History:Received Date: 17/9/2014
Revision Received Date: 17/12/2014
Acceptance Date: 23/12/2014
Electronic publication date: 31/7/2015
Collection year: 2015
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
This paper is based on the large section inclined shaft crossing goaf of Pingdingshan No.6 Mine as engineering background, and aimed at solving the difficult supporting problem of fractured surrounding rock. After establishing and calculating the mechanical models of U-steel and inverted arch, the support’s vertical reaction force (N1) and horizontal counterforce (X1) are determined as 180.96 KN and 48.12 KN, while the maximum bending stress (σmax) and ultimate bearing capacity of the inverted arch are obtained as 375.59 Mpa and 0.27 Mpa. It shows that the deformation of surrounding rock is well controlled by the supporting structure. The numerical simulation model is built by using the software FLAC3D to analyze the stability of surrounding rock after supporting. The results suggest that the deformation of roof, floor and sides is reduced by 17%, 23% and 71% respectively after supporting with U-steel in the inclined shaft, and the accuracy of results has been verified by a field experiment. Therefore, the “U-steel+ pouring concrete + inverted arch + backwall grouting” technology can effectively control the damage of surrounding rock and improve the stability of surrounding rock.