Title: Gob-side entry retaining formed by roof cutting without roadside support

Authors: Dawei Yin; Xiangxi Meng; Zhaoyi Zhang; Baocheng Liu

Addresses: State Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology, No. 579, Qianwan'gang Road, Qingdao, China ' State Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology, No. 579, Qianwan'gang Road, Qingdao, China ' State Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology, No. 579, Qianwan'gang Road, Qingdao, China ' Fourth Engineering Company Limited of China, Railway 22nd Bureau, China

Abstract: When using gob-side entry retaining (GSER) under hard-roof conditions, the roadside support deforms and destroys easily due to the great overburden stress induced by the large length and time of the hanging roof. Selecting the 20196 working face in the Linhua coal mine located in western China as an example, the technology of GSER formed by roof cutting without roadside support (RCWRS) is studied. The overlying strata movement characteristics, support system of the surrounding rocks, and pre-splitting construction technique are developed. And stress transfer and bearing of the hanging roof structure above retaining roadway are discussed. The deformation of surrounding rocks of the retaining roadway is also monitored. The engineering application shows that this technology can ensure the stability of the retaining roadway. The maximum roof subsidence is 172 mm, the maximum floor heave is 37 mm, and the coalside deformation is 56 mm. The above observations are significant for coal mining under hard-roof conditions. [Received: May 24, 2017; Accepted: December 4, 2017]

Keywords: hard roof; GSER formed by RCWRS; overlying strata movement characteristic; support system of surrounding rocks; pre-splitting construction technique.

DOI: 10.1504/IJOGCT.2018.093137

International Journal of Oil, Gas and Coal Technology, 2018 Vol.18 No.3/4, pp.467 - 484

Available online: 04 Jul 2018 *

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