Comparative bench testing of steel arch support systems With and without rock bolt reinforcements
PBN-AR
Instytucja
Główny Instytut Górnictwa
Informacje podstawowe
Główny język publikacji
angielski
Czasopismo
Archives of Mining Sciences
ISSN
0860-7001
EISSN
Wydawca
Instytut Mechaniki Górotworu Polskiej Akademii Nauk
DOI
Rok publikacji
2019
Numer zeszytu
4
Strony od-do
747-764
Numer tomu
64
Identyfikator DOI
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Autorzy
(liczba autorów: 1)
Słowa kluczowe
angielski
yielding steel arch support
ockbolting support system
mixed support
support work value
support load capacity
Open access
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Creative Commons — Uznanie autorstwa
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Razem z publikacją
Data udostępnienia w sposób otwarty
2019-12-16
Streszczenia
Język
angielski
Treść
The mining of hard coal deposits at increasingly greater depth leads to an increase in hazards related to the loss of stability of steel arch supports as a result of excessive static and dynamic loads. Camber beam reinforcement via rockbolting is often utilised in order to improve the stability of the yielding steel arch support.This article presents the results of comparative bench tests of the ŁP10/V36-type steel arch support, tested with and without reinforcement by means of self-drilling bolts with drunken R25 threads, using short joists formed from V32 and V25 sections. It also presents the results of comparative tests of the ŁPP10/4/V29/I-type steel arch support, tested with and without reinforcement by means of rock bolts with trapezoidal Tr22/13 threads, using short joists formed from V25 sections. The obtained test results, in the form of load courses and work values of the steel arch and mixed (arches and rock bolts) support systems, demonstrate that the utilisation of mixed support may significantly improve the stability of workings, particularly immediately after they are driven. A mixed support system quickly achieves its maximum load capacity together with a significant increase in its work value. It may thus prevent the stratification of the rocks surrounding the working, and therefore better utilise the self-supporting capacity of the rock mass. As evidenced by the test results, the mixed support work may be as much as 3.5 times as great compared to the steel arch support at the beginning of the height reduction process initiated by loading – i.e. until its reduction by a presupposed value of 100 mm.
Inne
System-identifier
PX-5dfb6358d5de0a26ba6ae3c0
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