To counter the technical difficulties faced by gob-side entry retaining (GER) under multiple complex mining geological conditions in China, this paper introduces a GER method with fully mechanized gangue backfilling mining. A similar materials simulation experiment was conducted to simulate the gob-backfilled GER process by using the similar model test system containing an independently developed horizontal pushing load device. The experimental results show that the compaction speed of the backfilling area (BFA) can be improved, and the main roof subsidence can be reduced by increasing the horizontal pushing load and reducing the attenuation rate of the stress in BFA. The designed roadside backfill body (RBB) containing a flexible cushion is adaptive to the given deformation of the main roof, thus reducing the stress concentration of the RBB. The field test results show that when a 2 MPa horizontal pushing load is exerted in the BFA, arranging a 200 mm high-water-material flexible cushion can cause the BFA to swiftly change to the compaction stage. After stabilized deformation, the roadway section satisfies the design and application requirements. The feasibility and rationality of the GER with the fully mechanized gangue backfilling mining are proved, providing a safe, efficient, and environmentally friendly mining method without using a coal pillar.
from #AlexandrosSfakianakis via Alexandros G.Sfakianakis on Inoreader http://ift.tt/2re6JJC
via IFTTT
Εγγραφή σε:
Σχόλια ανάρτησης (Atom)
Δημοφιλείς αναρτήσεις
-
Cancer is associated with genomic instability and aging. Genomic instability stimulates tumorigenesis, whereas deregulation of oncogenes acc...
-
Eribulin is one of the newer chemotherapeutic agents approved for use in later line treatment of patients with metastatic breast cancer. Pha...
-
<span class="paragraphSection"><div class="boxTitle">Abstract</div>It is not clear whether breast canc...
-
Related Articles Disrupted relationship between "resting state" connectivity and task-evoked activity during social percepti...
-
Abstract Helmet manufacturers recommend replacing a bicycle helmet after an impact or after anywhere from 2 to 10 years of use. The goal o...
-
Summary Emergency cricothyrotomy is a common feature in all difficult airway algorithms. It is the final step following a ‘can't intub...
-
Publication date: 10 June 2017 Source: Journal of Controlled Release, Volume 255 Author(s): Ožbej Zupančič, Andreas Bernkop-Schnürch Pept...
-
Ocular Vestibular Evoked Myogenic Potentials: Where Are We Now? Objective: Over the last decade, ocular vestibular evoked myogenic potential...
-
ACS Nano DOI: 10.1021/acsnano.7b01172 from #AlexandrosSfakianakis via Alexandros G.Sfakianakis on Inoreader http://ift.tt/2qaCNQg via...
Δεν υπάρχουν σχόλια:
Δημοσίευση σχολίου