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Test of ordinary concrete and waste-rock bandfor roadside supporting in gob-side entry retaining(PDF)

西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

Issue:
2016年06期
Page:
813-817
Research Field:
Publishing date:

Info

Title:
Test of ordinary concrete and waste-rock bandfor roadside supporting in gob-side entry retaining
Author(s):
ZHANG Jiu-yu
College of Mining and Safety Engineering,Shandong University of Science and Technology,Qingdao 266590,China
Keywords:
gob-side entry retaining waste-rock bag concrete critical cantilever beam numerical simulation
PACS:
TD 353
DOI:
10.13800/j.cnki.xakjdxxb.2016.0609
Abstract:
Based on the movement law of roof strata and deformation characteristics,the feasibility of the ordinary concrete and the waste-rock band for roadside support is analyzed using FLAC3Dsimulation,and the effect of the 3 support schemes of the gob-side entry retaining is analyzed.By establishing the mechanical model of roof fracture,the concept of the critical cantilever beam is put forward,and the supporting resistance and width are obtained.The practice shows that the initial period of the roof is effectively controlled by use of the waste-rock band,which effectively compensates the shortcomings of the initial setting time of concrete and the low initial setting strength.Using concrete as the filling material,it is well adapted to the movement of the thick gray rock in the goaf.

References:

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Last Update: 2016-11-28