scholarly journals Research progress in the mining technology of the slowly inclined, thin to medium thick phosphate rock transition from open-pit to underground mine

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Xiaoshuang Li ◽  
Yunming Wang ◽  
Shun Yang ◽  
Jun Xiong ◽  
Kui Zhao
Keyword(s):  
Underground Mining ◽  
Failure Process ◽  
Economic Value ◽  
Phosphate Group ◽  
Open Pit ◽  
Research Progress ◽  
Engineering System ◽  
Technical Problems ◽  
Ore Bodies ◽  
Soft Interlayer

Abstract This paper takes the deep ore body of Yunnan Phosphate Group Co. Ltd, the largest open-pit chemical mining enterprise in China, as the research background, and systematically introduces the technical problems recognised by many Chinese researchers in the past eight years on the open-pit to underground mining of gently inclined thin to medium-thick ore bodies with a soft interlayer. It shows that the mining of open-pit transferred to underground is a complex engineering system, and the underground stope surrounding rock and overlying strata present a nonlinear failure process. Through mining process innovation, mining method innovation and improvement, research was undertaken on new processes and technologies for phosphorus mining under complex conditions. The relevant research results not only have important economic value and academic significance for Yunnan Phosphate Group Co. Ltd. but also have important guidance and impetus to the exploitation of a large number of similar phosphate resources in China.

The Prediction of Northern Slope Deformation and Failure Caused by the Transformation of Open-Pit to Underground Mining in the Yanqianshan Iron Mine

2014 ◽  
Vol 580-583 ◽  
pp. 364-370
Author(s):  
An Lin Shao ◽  
Hai Long Feng
Keyword(s):  
Slope Failure ◽  
Underground Mining ◽  
Limit Equilibrium ◽  
Failure Process ◽  
Open Pit ◽  
Northern Slope ◽  
Body Distribution ◽  
Ore Bodies ◽  
Sublevel Caving ◽  
Iron Mine

<span><p class="TTPAbstract"><span lang="EN-US">The Yanqianshan<a name="OLE_LINK94"></a><a name="OLE_LINK93"></a> iron mine is preparing to transform from an open-pit mine to an underground mine. We adopt the <a name="OLE_LINK104"></a><a name="OLE_LINK103"></a>non-pillar sublevel caving approach to exploit the particularly thick steep ore bodies within the range from -183 m to -500 m from top to bottom. According to the features of ore body distribution and the approaches of exploitation, we expect that underground mining will result in <a name="OLE_LINK102"></a><a name="OLE_LINK101"></a>the loss of stability on the northern slope of the open pit, causing traction-type landslides. Moreover, along with increasing the depth of the mining operation, the range of slope failure will continue to expand and further affect the safety of drainage features and roads distributed on the north side of the open pit. For this purpose, we select f</span><span lang="EN-US">our</span><span lang="EN-US"> sections along the trending direction of ore bodies and apply the limit equilibrium method to predict the failure process and characteristics on the northern slope according to the stratified mining process.</span><span lang="EN-US"><o:p></o:p></span></p>

Disaster Prevention of Mining Field Roof Fall in Open Pit to Underground

2013 ◽  
Vol 310 ◽  
pp. 198-201
Author(s):  
Yao Ji Li ◽  
Xiao Shuang Li ◽  
Wei Le Geng
Keyword(s):  
Underground Mining ◽  
Field Trips ◽  
Phosphate Group ◽  
Open Pit ◽  
Disaster Prevention ◽  
Related Research ◽  
Mine Site ◽  
Research Results ◽  
Roof Fall ◽  
Site Field

The research object is transformation the deep orebody of jinning phosphate which belong to Yunnan Phosphorus Group Co from pit to underground mining. Through the mine-site field trips, on the basis of the existing mine geological occurrence conditions, proposed a stope roof fall disaster prevention technology which suitable for mining actual project overview. And related research results can provide theoretical guidance and advice of roof fall disaster for mining of Yunnan Phosphate Group or other similar conditions mines which are in transformed from open pit to underground mining.

Rock Pressure Activity Regularly due to Underground Mining of the Deep Phosphorus Ore with Several Inclination by Similar Material Simulating Experiment

2014 ◽  
Vol 529 ◽  
pp. 260-264
Author(s):  
Xiao Shuang Li ◽  
Yao Ji Li ◽  
Meng Lai Wang ◽  
Shu Hu
Keyword(s):  
Rock Pressure ◽  
Phosphate Rock ◽  
Underground Mining ◽  
Phosphate Group ◽  
Systematic Research ◽  
Overburden Rock ◽  
Deformation And Failure ◽  
Ore Bodies ◽  
Dip Angle ◽  
Space Range

On basis of the geology mining condition of the deep ore bodies of north mining area of Two-hang hau of Jingning mine of Yunnan phosphate group Co. Ltd, the strata behavior regularity of the working-face in the process of underground mining was systematic research with the dip angle of twenty degreen and fity degren. The result showed that:(1) after the underground mining of the phosphorus ore , the stress bearing of the excavation phosphate rock transfer to the surrounding rock mass, the initial rock stress was disturbated, this process has been extend outward with the expansion of the excavation space, deformation and failure problems has been happened, and the new stress equilibrium will be formed in the last, mined-out area was formed after ore body,s excavation, near the gob roof area formated stress unloading area, stress formed in certain areas ahead of the stope roof pressurization district, with the excavation of the ore bodies, the roof stress pressurization district dynamic forward position, the pressurization district scope and degree of pressure also decreases as the excavation scope of mined-out area space and gradually increase, and is located in the rear area of the stope deformation of old goaf roof damage fracture belt and the abscission zone was gradually closed. and in the mined-out area space range after reaching a certain size tends to be stable,then recovery section stress and to support its upper part of the gravity of overburden rock. (2)As the orebody dip Angle increases, the same excavation space range, goaf in front of the maximum stress concentration factor was reduced, unloading of overburden rock and concentrated area of the whole range becamed smaller, the rock pressure activity becamed easing as a whole. Relevant results can provide Yunnan phosphate group co., LTD., subordinate to the mines and mining under similar conditions of phosphate rock mountain project to provide certain reference basis.

scholarly journals EXTRACTION OF OPEN PIT BOTTOM RESERVES BY ROOM-AND-PILLAR METHOD USING HYBRID BACKFILL

2021 ◽  
Vol 2 (4) ◽  
pp. 205-215
Author(s):  
Sergei A. Shchukin ◽  
Aleksandr A. Neverov ◽  
Sergei A. Neverov
Keyword(s):  
Underground Mining ◽  
Strain Analysis ◽  
Open Pit ◽  
Structural Elements ◽  
3D Fem ◽  
Ore Bodies ◽  
Mining Safety ◽  
The Stability ◽  
Limiting Case ◽  
Mine Roof

For the transition from open pit to underground mining in thin and steeply dipping ore bodies, it is proposed to use the room-and-pillar method with hybrid backfill. The geotechnology assumes bottom-up mining within levels which are generally sequenced top downward. The hybrid backfill is waste rock and rubble concrete. The authors discuss the multivariate problem on the stability of structural elements of the geotechnology with ranking of basic parameters in the field of natural tectonic stresses. The geotechnology safety is proved by the 3D FEM-based stress-strain analysis of the limiting case of mine roof spans. The stress patterns in the structural elements of the technology are determined, and the areas of instability are identified. The rubble concrete pillars effectively ensure mining safety with the discussed technology. The hybrid backfill as against rock fill is a more reliable method of ground control, especially in case of increasing thickness of ore bodies.

scholarly journals Study on the Process and Mechanism of Slope Failure Induced by Mining under Open Pit Slope: A Case Study from Yanqianshan Iron Mine, China

2019 ◽  
Vol 2019 ◽  
pp. 1-26
Author(s):  
Yingpeng Hu ◽  
Fengyu Ren ◽  
Hangxing Ding ◽  
Yu Fu ◽  
Baohui Tan
Keyword(s):  
Slope Failure ◽  
Underground Mining ◽  
Ground Deformation ◽  
Failure Process ◽  
Google Earth ◽  
Open Pit ◽  
Mechanism Analysis ◽  
Eastern Slope ◽  
Rock Creep ◽  
Iron Mine

Mining under an open pit slope results in the collapse and slide of the slope. In this paper, a combination of methods including Google Earth and field investigations is applied to investigate the process of eastern slope failure induced by underground mining in the Yanqianshan Iron Mine over five years. According to the observed ground deformation features, the geomorphic zone of the eastern slope can be divided into four regions (caved rock zone, cracking zone, toppling zone, and sliding zone). Break angles and fracture initiation angles at different times are counted separately. Based on the above work, the process of initiation and development of slope failure is studied. The analysis results show that the process of slope failure could be chronologically divided into three stages. First, a collapse pit, caused by the falling of the overlying strata above the goaf, appeared on the eastern slope. Then, the rock mass around the collapse pit slid into the pit to form a small landslide. Finally, because of mining disturbances and rock creep, a large landslide occurred on the northeastern phyllite slope. The control mechanisms of each failure stage are discussed separately. Finally, the RFPA3D code is employed to simulate the slope failure process under the influence of underground mining. The results are consistent with the field observations, which provided information on deformation failure and the mechanics of the slope that could not be directly observed in the field and deepened the mechanism analysis.

Combined optimisation of an open-pit mine outline and the transition depth to underground mining

2018 ◽  
Vol 268 (2) ◽  
pp. 624-634 ◽  
Author(s):  
D. Whittle ◽  
M. Brazil ◽  
P.A. Grossman ◽  
J.H. Rubinstein ◽  
D.A. Thomas
Keyword(s):  
Underground Mining ◽  
Open Pit Mine ◽  
Open Pit ◽  
Transition Depth
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