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 Forecast for the formation of zones of high rock pressure in the conditions of mining ore deposits in a combined way

2019 ◽  
Vol 129 ◽  
pp. 01021
Author(s):  
Marina Potapchuk ◽  
Boris Saksin ◽  
Aleksandr Sidlyar ◽  
Andrey Tereshkin ◽  
Maksim Rasskazov
Keyword(s):  
Rock Pressure ◽  
Ore Deposits ◽  
Open Pit ◽  
Eastern Region ◽  
Structural Elements ◽  
Ore Bodies ◽  
Mine Workings ◽  
The Stability ◽  
Far Eastern ◽  
Underground Method

The prospect of mining the majority of deposits in the Far Eastern region is associated with the need to switch from the open-pit to the underground method of developing deep-lying ore bodies. Ensuring the safest conditions for the combined development of the field is possible only after comprehensive studies have been carried out that make it possible to establish the peculiarities of the formation of the stress state in the rock mass taking into account the influence of various natural and technogenic factors. An assessment of the stability of structural elements of the proposed development systems at the deposits will allow identifying potentially impact hazardous areas and developing measures to maintain and protect mine workings, which will reduce the risk of dynamic manifestations of rock pressure.

scholarly journals SAFETY IN SUBSTOPING-AND-CAVING IN TECTONICALLY STRESSED ROCK MASSES

2021 ◽  
Vol 2 (3) ◽  
pp. 311-321
Author(s):  
Sergey A. Neverov ◽  
Anton I. Konurin ◽  
Yuri N. Shaposhnik
Keyword(s):  
Mathematical Modeling ◽  
Underground Mining ◽  
Open Pit ◽  
Open Pit Mining ◽  
Variable Degree ◽  
Structural Elements ◽  
Mining System ◽  
Sublevel Caving ◽  
Mine Workings ◽  
The Stability

Mining of a thick steeply dipping deposit using sublevel caving with end-face ore drawing in transition from open pit excavation to underground mining is considered in conditions of developed tectonics. The technology was justifed by mathematical modeling of the stress state of the rock mass using finite element method. Safe parameters of the mining system were determined by solving a variational problem with a variable degree of geomedium disturbance in the existing mining and engineering structure when depleting reserves at an advanced stoping stage. The predicted areas of stability losses for main structural elements of the mining system have been determined. Safe parameters of ore breaking and drawing were calculated using the stability condition of mine workings. Recommendations are given for the excavation of thick steeply dipping deposits under open pit mining.

Analysis of the Relative Position of the Slope and Underground Mining Area and its Influence Properties

2013 ◽  
Vol 634-638 ◽  
pp. 3277-3281 ◽  
Author(s):  
Shi Guo Sun ◽  
Hong Yang ◽  
Chun Sheng Li ◽  
Bao Lin Zhang ◽  
Jia Wang ◽  
...  
Keyword(s):  
Slope Stability ◽  
Underground Mining ◽  
Mining Area ◽  
Open Pit ◽  
Stability Factor ◽  
Mining Depth ◽  
Extracellular Region ◽  
Geological Conditions ◽  
Slope Rock ◽  
The Stability

The stability state of slope rock mass is relating to each other’s relative location during the transformation from open-pit to underground mining, it’s the most disadvantageous influence on the slope stability when the underground mining area is located in the toe of slope, and it’s the best influence as in the slope extracellular region. Slope stability factor changes with the geometric dimensions of underground mining increased, but not in direct proportion. Under the condition of constant geometric dimensions of mining area, the influence on slope stability is changing with the mining depth increased. Thus indicating that the influence on slope stability by underground mining has its spatial property, and to determine the specific influence value requires a combination of many factors, such as the relationship of relative spatial position, the geometric dimensions of mining area, engineering geological conditions and so on.

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>

Study of the Influence of Block Caving Underground Mining on the Stability of the Overlying Open Pit Mine

2021 ◽  
Author(s):  
Nathan Chimi Tegachouang ◽  
Victor Mwango Bowa ◽  
Xinping Li ◽  
Yi Luo ◽  
Wenping Gong
Keyword(s):  
Underground Mining ◽  
Open Pit Mine ◽  
Open Pit ◽  
Block Caving ◽  
The Stability

Analysis of the Open-Pit to Underground Mining Slope Stability

2014 ◽  
Vol 484-485 ◽  
pp. 599-603
Author(s):  
Guang Ming Bao ◽  
Juan Chang ◽  
Zhi Gang Liu
Keyword(s):  
Numerical Simulation ◽  
Slope Stability ◽  
Underground Mining ◽  
Open Pit ◽  
Maximum Displacement ◽  
Modeling Software ◽  
Stability Of Slope ◽  
Computer Numerical Simulation ◽  
The Stability ◽  
Mining Slope

This paper uses the simulation technology of computer numerical simulation, combined with the GAMBIT numerical modeling software and ANSYS structure analysis software, we carry out an in-depth research and analysis on the stability of engineering simulation, at the same times establish the mathematical model of ANSYS numerical simulation displacement stability and design the ANSYS command stream program algorithm. Finally, this paper uses the open-pit to underground mining slope stability as an example, to verify the reliability of the model and algorithm. Through the numerical simulation, we get the displacement of slope in the Y direction and Z direction. In the Y direction, the maximum displacement is 0m, the negative maximum displacement is 5.88m and displacement is relatively large; in the Z direction, the maximum displacement is 1.32M, the negative maximum displacement is 1.08M and the stability of slope is different in different position. The numerical simulation provides the theory reference for the safety of mining engineering.

Study on Stability and Failure Characteristics of the Slope in Transition from Open-Pit to Underground Mining by Structural Geology

2012 ◽  
Vol 170-173 ◽  
pp. 932-936 ◽  
Author(s):  
Yun Fei Wang ◽  
Fang Cui
Keyword(s):  
Underground Mining ◽  
Structural Features ◽  
Open Pit ◽  
Slope Surface ◽  
Failure Characteristics ◽  
Structure Surface ◽  
Engineering Geological Zoning ◽  
Slope Rock ◽  
The Stability ◽  
The Impact

According to the impact on the slope characteristics, characteristics of underground ore occurrence, underground ore mining, the open pit slope can be separated by engineering geological zoning. After analyzed the factors that affect the stability of the slope rock, such as the combination relation between the slope surface and the structure surface, deposits of occurrence conditions, structural features and so on. The combination of cutting and under the action of the form may be made of the damage and determine the stability of the various partitions.

scholarly journals Stability Analysis of Underground Multicavities in Bench Blasting Vibration

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Deqing Gan ◽  
Xi Yang ◽  
Yunpeng Zhang ◽  
Xinyu Wei
Keyword(s):  
Underground Mining ◽  
Open Pit ◽  
Open Pit Mining ◽  
Mining Activities ◽  
Potential Threat ◽  
Attenuation Relations ◽  
Bench Blasting ◽  
Iron Mine ◽  
Underground Cavities ◽  
The Stability

Underground cavities formed by underground mining activities are a potential threat to open-pit mining activities. Longtan Village Iron Mine is located in Chengde city, Hebei province, China. The open-pit mining and underground mining of Longtan Village Iron Mine are simultaneously performed. Cavities will remain after underground mining. When mining is performed on the top of the underground cavities in the open pit, concerns arise regarding the closest distance to prevent the collapse of the cavities. (The closest distance is the safe distance between the explosive and the cavities. If the distance between the explosive and the cavities is less than the closest distance, the stability of the cavities will be affected.) The collapse will endanger the safety of the workers and equipment in the open pit. Therefore, it is necessary to estimate the stability of the underground cavities near the bench blasting. In this paper, a series of bench blast tests was performed, and the site-specific attenuation relations of the PPV (Peak particle velocity) and principal frequency of Longtan Village Iron Mine were obtained. Then, an ANASYS three-dimensional numerical model was created, and the propagation of the blast wave and the response of the multicavities were calculated by LS-DYNA. The accuracy of the simulation was verified. However, the bench blast tests do not affect the stability of the cavities. The formula to calculate the closest distance was obtained, which can be used as an approximate guide when designing the bench explosion of Longtan Village Iron Mine. Workers can mine in a safe area of the open pit, and the stability of the cavities will not be affected.

scholarly journals Restrictions on seismic impact of blast in the open-pit border zone at the open-pit and combined mining

2019 ◽  
Vol 129 ◽  
pp. 01001 ◽  
Author(s):  
Vyacheslav Kutuev ◽  
Sergey Zharikov
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Negative Impact ◽  
Seismic Effect ◽  
Border Zone ◽  
Open Pit ◽  
Main Task ◽  
The Stability ◽  
Seismic Impact ◽  
Drill And Blast

The combined mining under the condition of underground mining in the aquifer rock mass of the open-pit sides raises an acute issue of joint drill-and-blast works (D&B). The construction of an underground mine begins normally with the approach of the open-pit mine depth to the final marks. In this situation, if there is a volume for the cutback, it is very small, and the blast works come close to the limit open-pit contour, behind which the protected rock mass is located and in the future the underground mining is supposed to be carried out. The main task in the drill-and-blast works under such conditions is to preserve the stability of this rock mass. The well-timed shielding of the blast and creating the fracture surfaces by the trim blasting reduce the negative impact of the blast on the open-pit side, but do not always prevent the propagation of stress waves caused by the seismic effect along the rock mass. Therefore, restriction of the seismic effect of blast in the border zone is as important for the stability of the rock mass as professional deviated contour holes.

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