To improve the efficiency and reduce costs of cemented-fill mining, we propose a continuous mining and continuous backfilling (CMCB) method based on the coal resources at the Yuxing mine in Inner Mongolia, China, and constructed a complete filling material transportation system.
During mechanized continuous mining, the depth of cut (DOC) of picks on the drum directly affects the forces exerted on the picks, as well as the forces and torque …
To improve the efficiency and reduce costs of cemented-fill mining, we propose a continuous mining and continuous backfilling (CMCB) method based on the coal resources at the Yuxing mine in Inner …
In order to analyze the stability of the stope under continuous mining with the room–pillar method for a kind of orebody with a long inclination, but not deep mining, this paper takes the room–pillar method for the continuous mining of a long-inclination orebody in the Mengnuo Lead–Zinc Mine, Yunnan Province as …
Since entering deep coastal mining, in order to expand productioncapacityofthemine,thelargeandthickorebodyin the middle, for the rst time, applied medium deep hole for sublevel open stoping with subsequent back lling to conduct continuous mining, and the upper and lower triangular ore body followed the original …
In this paper, a new modified combined compression and shear test (MC-CAST) system was firstly developed for achieving the specimen inclined loading and then used to carry out the inclined uniaxial compression test of water-bearing coal specimens at the inclination angle of 0°, 5°, 10°, and 15° and the moisture content of 0%, 2.42%, …
Geotechnical Considerations in Underground Mining/Department of Industry and Resources Guideline Document No.: ZME723QT 1.0 INTRODUCTION The potentially hazardous nature of underground mining requires the application of sound geotechnical engineering practice to determine the ground conditions, the ground support and reinforcement …
According to the analysis of the migration of the overlying rock with the paste filling in the continuous mining face, it can be known that with the progress of the mining and filling process, the width of the backfilling body gradually increases.
Geotechnical Considerations in Underground Mining/Department of Industry and Resources Guideline Document No.: ZME723QT 1.0 INTRODUCTION The potentially hazardous …
In this paper, a new modified combined compression and shear test (MC-CAST) system was firstly developed for achieving the specimen inclined loading and …
Keywords: continuous deformations, mining tremors 1 Introduction Mining is the economy flywheel, which supplies following raw materials: energetic, chemical, metallic and rock. …
Continuous advance of the slope requires a sequence of benches (60–120 m wide) and drops (15–25 m high), having an overall inclination (v:h) between 1:4 and 1:7. The figure shows five, 25 m high benches in the upper steriles of the Mavropigi mine in the Ptolemais Field. The average slope inclination is 1:5 Full size image
When using the CMFB with 75% fly ash content and 28 d curing time, the maximum values of vertical displacement, horizontal displacement, inclination, horizontal deformation and curvature of …
This paper presents a discussion on the effect of drain holeinstallation with an inclination angle of 65° and 90° on the discharge and drain hole length. The results show that the drain hole with an angle of 65° results in …
The paper investigates the stability of deep continuous surface lignite mining slopes. As excavation slopes are made relatively steep for exploitation purposes, the risk of slope instabilities is often appreciable, while the adverse consequences of a major failure are usually severe. Despite these, the design of lignite mining slopes against ...
The goal of this study is to analyze the possible influence of present and former mining activities on the selected set of model slope deformations in the …
continuous mining miner with backfilling method can achieve the efficient recovery of coal resources under ... the local maximum angle of coal seam inclination is about 16 °, and the minimum is ...
During Pleistocene the area of Poland has underwent an influence of several glaciers. This resulted in high density of ground and pushed in stones and erratic boulders of various size. Such a...
The present invention discloses a kind of comprehensive put in high inclination-angle split coal and turns fully mechanized mining and continuously promote recovery method, turns higher slice fully mechanized mining and lower leaf fully mechanized mining three phases comprising longwall top coal caving, comprehensive put.Transport and tailgate are dug …
Guo et al., analyzed the stability of the surrounding rock in the deep continuous mining of a steep-inclined orebody by monitoring, field investigation and other means, and revealed the influence law of the fault on the movement effect of the surrounding rock mass.
1 Geotechnical factors influencing selection of mining method 2 Mining Method Classification 3 Change of Mining Method in a Mining Operation 4 Thickness and Orientation of Mineralization 5 Ore and Country Rock …
Continuous extraction and continuous backfill (CECB) mining was selected as the mining method to meet the aforementioned objectives. ... the maximum values of vertical displacement, horizontal …
The influence of joint inclination angle, azimuth angle and spacing on the damage of coal face is analyzed. It is found that the stability of coal face is mainly affected by joint spacing (Guo et al. 2021 ). …
The influence of joint inclination angle, azimuth angle and spacing on the damage of coal face is analyzed. It is found that the stability of coal face is mainly affected by joint spacing (Guo et al. 2021 ). …
5.3.1: The Continuous Mining Machine. A picture is worth a thousand words… so, let's look at the front of a continuous miner. The cutting drum is about 2' in diameter and perhaps 12' wide. It is laced with carbide cutting bits, and the drum rotates at about 1 revolution per second. The cutting head is sumped into the top of the seam ...
At first glance, the influence of slope inclination appears well understood. If we first consider the simple case of a block sliding down an inclined plane, the influence of slope inclination on the distal reach of a landslide is straightforward. This idealized case is represented in Fig. 1a and b, for slope angles of twenty and thirty degrees.
Belt Positioning and Skewing Prevention in Lignite Mining Using Long-Wavelength Infrared Cameras. Conference Paper. Jan 2015. Proceedings of the 12th International Symposium Continuous Surface ...
Despite this fact, continuous deformations of the land surface may pose a certain risk to linear objects (railway lines, roads, pipelines, etc.), while significant changes in stress and strain states inside the rock mass, resulting from the accumulation of water, can lead to discontinuous deformations. 13 These deformations pose a great risk to ...
Based on the gas–solid two-phase flow theory, numerical simulation of the dust dispersion law of fully mechanized mining work under different inclination angles and comparative analysis of field ...
In this paper, a series of biaxial compression tests with different load ratios are conducted on specimens each containing a single penny-shape crack inclined at 45° or 60° to the major principal stress direction (but parallel to the intermediate principal stress direction), or a square-shape crack inclined at 30° to the major principal stress …
• Inclination of the seam should not exceed 300 with horizontal. • Driving several openings at one time increases production and efficiency by providing multiple working places. ... Continuous Mining: …
Erdos Miller decided to develop a continuous inclination and azimuth algorithm about a year ago. We believed that it would be possible, using modern state estimation algorithms, to cut through the …
The geometry of the two flaws in the numerical marble specimens is shown in Figure 7. The flaw length is 10 mm, and the bridge length between the flaws is 14 mm. The bridge angle is 30°, and the flaw inclination angle varies from 0° to 90° in 30° interval. The flaws were created by deleting particles in a specific range.
The geometry of the two flaws in the numerical marble specimens is shown in Figure 7. The flaw length is 10 mm, and the bridge length between the flaws is 14 mm. The bridge angle is 30°, and the flaw inclination angle …
The continuous miner will continue advancing forward with the sump-shear cycles until there is a reason to stop the advance. In U.S. coal mines, the forward advance is limited by a few factors: the need to ventilate the face …
Based on the gas–solid two-phase flow theory, numerical simulation of the dust dispersion law of fully mechanized mining work under different inclination angles and comparative analysis of field ...
In this paper, a physical model test is carried out to study the failure process and movement mechanism of overburden in steeply inclined multi-seam stepwise mining. The results show that at the initial stage, the main failure of the rock mass is the small-scale collapse at the initial cut and the roof (stability stage of the rock mass).
