Open AccessStudy on Mining Technology of Shallow Hole + Deep Hole Shrinkage method with Ductule Grouting in Advance for Roof Reinforcement
Author(s) -
Jianbo Xia,
Yunhai Cheng,
MeiJun Zhao,
Cong Liu,
Wen Yan
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/295/4/042123
Subject(s) - roof , reinforcement , geotechnical engineering , layer (electronics) , shrinkage , mining engineering , displacement (psychology) , geology , structural engineering , engineering , computer science , materials science , composite material , psychology , machine learning , psychotherapist
In this paper, the mining method of shallow-hole and deep-hole shrinkage with ductule grouting in advance for roof reinforcement is studied, which is used to recover steeply inclined thick orebody with broken roof. The main innovations in mining technology are as follows: the orebody is artificially divided into two layers, the upper layer is mined by shallow hole blasting, the lower layer is mined by parallel deep holes, both layers advance simultaneously from bottom to top, the mining face of the upper layer is 3.6 meters higher than that of the lower layer, thus forming an inverted step working face in which the mining operation and roof protection are carried out, using ductule to reinforce the broken roof by grouting in advance, and arranging bolts systematically to anchor the grouting reinforced layer into deep rock mass. By using the method of orthogonal test design and in-situ experiment, the reasonable construction parameters of ductule grouting are obtained, which have been applied to No. 7 stope of of stage 3840 in Qaza Lead-Zinc Mine in Yunnan Province and achieved good results. By monitoring the displacement of reinforced layer during and after mining, no obvious displacement and collapse are found, which proves the feasibility of this technology. The mining scheme has a good reference value for similar ore deposits with mining technical conditions.