Gob-side entry retaining

Author: aaku

August undefined, 2024

WebThe technology for gob-side entry retaining in steep coal seams is still in the development stage. The analysis results of the caving structure of main roof, low influence of gateway’s stability ... WebDec 1, 2015 · Yuwu coal mine employs an innovative approach to gob-side entry retaining in N2105 panel (Fig. 5a), which is a highly gassy fully-mechanized top-coal caving panel. The inner N2105 intake entry is retained behind of the panel as the air-return gateroad, part of the whole ventilation system.

A Case Study on Gob-Side Entry Retaining Technology in the

WebMar 20, 2024 · According to the movement characteristics of the surrounding rock of the gob-side entry retaining by roof cutting (GERRC), the structural evolution mechanism and stability control countermeasures are studied in this paper. Taking the roof cutting and bulking as the core point, the movement process of the surrounding rock of GERRC is … WebMay 6, 2024 · Gob-side entry retaining (GER) refers to maintaining either headentry or tailentry behind the working face by constructing a fill-in sidewall on the gob side with … ganz christmas tree measuring spoons

International Journal of Rock Mechanics & Mining Sciences

WebAug 30, 2024 · The coal wall, gob-side backfill, and gangues in goaf, constitute the support system for Gob-side entry retaining (GER) in coal mines. Reasonably allocating and … WebAt present, the commonly used section roadway protection methods can mainly be classified into two categories: gob-side entry driving with small coal pillars (GSEDSCP) [6,7] and gob-side entry... WebGob-side entry retaining, also termed as non-pillar mining, plays an important role in saving coal resources, high production and efficiency, extending the service life of mine and improving the investment benefit. ganz clowns

An innovative approach for gob-side entry retaining in highly …

The segmental subsidence structure with immediate roof of gob side ...

WebAug 6, 2024 · Gob-side entry retention by roof cutting changes the structure of the roadway roof and goaf roof by directional energy-accumulating blasting, and it realizes goaf-side roadway protection and pillar-free mining by utilizing the collapse and swelling of … WebJul 1, 2024 · In this study, we aiming at the problems of severe surrounding rock deformation and support failure during the reuse of gob side entry retaining, we … black lion pub st clearsWebFeb 23, 2024 · Understanding the dynamic loading mechanism of gob-side entry retaining (GER) in TCS with THF is the first step in determining the stability of the retained … ganz coffee cups

"WebMar 15, 2024 · When gob side entry retaining is carried out in backfill mining, the roof will show different subsidence morphology due to the difference of compactness and supporting force of the backfill body at different positions. This paper analyzed the immediate roof subsidence structure under two extreme conditions, constructed the roof segmented … " - Gob-side entry retaining

Gob-side entry retaining

WebMar 1, 2024 · rock of a roadway in gob-side entry retaining is improved by roof cutting and pressure relief, and it is concluded that the large amount of elastic energy stored in the … WebGob-side entry retaining “Flexible-hard” artiﬁcial wall Hard roof Mechanical model 1. Introduction In recent years, gob-side entry retaining technique has been widely used …

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WebJul 28, 2024 · Gob-side entry retaining (GSER) is currently the most widely used no-pillar mining technology in the global coal industry [ 1 – 5 ]. It can decrease the waste of coal resources, decrease the extraction ratio, and realize y-type ventilation. However, it also exhibits limitations. WebJan 1, 2024 · 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...

WebAug 11, 2024 · Unlike the traditional gob-side entry retention, the gob-side entry retaining by roof cutting cuts off the roof strata of the roadway and the gob using bidirectional concentrated blasting technology [ 1, 2, 3 ]. After the working face is mined, the roof strata of the gob collapse and form a new rib. WebNov 6, 2024 · Gob-side entry retaining (GER) is a popular non-pillar mining technique regarding how to reserve a gateroad for the use of next panel mining. When used in thick coal seams, the conventional entry retaining method requires a huge amount of filling materials and may cause entry (gateroad) accidents.

WebMar 19, 2024 · Gob-side entry retaining is an environmentally friendly nonpillar mining technology with high efficiency and safety. With the continuous exploration of the gob-side entry retained by filling (GERF) with roadside supports, the … WebOct 30, 2024 · Abstract. Gob-area roof rupture movement is a key disturbance factor for gob-side entry retaining. The characteristics of gob-area sequential roof collapse of …

http://yuxiqbs.cqvip.com/Qikan/Article/Detail?id=7103526305 black lion realWebSep 1, 2015 · The structural optimization technology of overlying strata for gob-side entry retaining with hard roof condition has been proposed, which is compounded by roof caving optimization advanced the... ganz company pursesWebNov 21, 2024 · Gob-side entry retaining is a common mining method in coal mining. In the conventional gob-side entry retaining (CGER) method, the entry of the current mining working face will be retained to be reused for the next working face by constructing an artificial wall along the gob side. ganz coffee scoopWebJul 1, 2014 · Effect of gob-side entry retaining. The conclusion from the working face field tests of gob-side entry retaining is that roadway deformation is controlled and meets … black lion pub thirskWebApr 8, 2024 · Gob-side entry retaining can improve the coal recovery rate, reduce the excavation rate, and reduce the probability of rock burst, which is an important … black lion real animalWebIn the gob-side entry retaining technology of roof cutting and pressure relief, one side of the roadway is solid coal, and the other side is the rock block caving area in the goaf. The key block B structure will be formed in the rock section of the retained roadway roof. black lion realty nashville tnWebOct 1, 2024 · In the paper, longwall mining based on no-pillar mining technique with automatically formed gob-side entry retaining is proposed. The concept and key … black lion rampant