Deformation and failure characteristics of high and steep slope and the impact of underground mining

2014 ◽  
pp. 469-476
Keyword(s):  
Underground Mining ◽  
Steep Slope ◽  
Failure Characteristics ◽  
Deformation And Failure ◽  
The Impact ◽  
High And Steep Slope

scholarly journals Study of Passive Protective Net Protecting the Rockfall Caused by Open-Pit Blasting on High and Steep Slope

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Zhiyu Zhang ◽  
Qingyun Qian ◽  
Jianguo Wang ◽  
Haoshan Liu ◽  
Ke Liang ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Impact Force ◽  
Impact Resistance ◽  
Steep Slope ◽  
Interaction Time ◽  
Open Pit ◽  
Buffer Time ◽  
The Impact ◽  
Impulse Force ◽  
High And Steep Slope

In order to prevent rockfall caused by open-pit blasting on the high and steep slope and ensure that the passive protective net structure has sufficient impact resistance, the mechanism of blasting flyrock causing rockfall is analyzed by using ANSYS/AUTODYN to establish the model of rockfall and passive protective net; at the same time, the influences of protective net size, rockfall kinetic energy, and rockfall size to the protective effect were also studied. The results show that under the condition of the same rockfall kinetic energy and rockfall size, the larger the size of the protective net, the longer the buffer time, and the impact force that net can sustain is greater; by assuming the protective net size and rockfall size to be a constant, the greater the rockfall kinetic energy, the less the interaction time between rock and net, and the greater the impulse force that net can suffer; similarly, by keeping the protective net size and the kinetic energy of rockfall to be a constant, it is found that the larger the size of the rockfall, the larger the interaction area and longer interaction time with the net, and the less net will be disrupted; the protective net used in the mine can intercept the rockfall caused by flyrock in blasting process effectively and ensure the safety of villager at the foot of the mountain.

scholarly journals Research on the Evolution Characteristics of Rock Mass Response from Open-Pit to Underground Mining

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Jiabo Geng ◽  
Qihang Li ◽  
Xiaoshuang Li ◽  
Tao Zhou ◽  
Zhifang Liu ◽  
...  
Keyword(s):  
Underground Mining ◽  
Vertical Direction ◽  
Mining Area ◽  
Open Pit ◽  
Measuring Point ◽  
Deformation And Failure ◽  
Ore Body ◽  
Evolution Characteristics ◽  
The Impact ◽  
Overlying Strata

This study is based on the engineering background of pit no. 2 in Jinning Phosphate Mine, China. In order to systematically analyze the movement, deformation, and failure laws of surrounding rocks in underground stopes. The room and pillar method is used to excavate and stop the ore bodies in the mining area. Combined with the similar physical model experiments and discrete element MatDEM numerical simulations, it reveals the deformation and failure laws and evolution characteristics of the surrounding rock of the stope in the process of converting from open-pit to underground mining. The results show the following: (1) Along the inclination of the ore body, the farther the horizontal and vertical displacements are from the underground stope, the less the impact of mining stress. On the other hand, along the inclined vertical direction of the ore body, the farther the measuring point is from the stope, the smaller the range of mining influence will be. (2) In the process of ore body recovery, the rupture of the overlying strata of the stope has an obvious layered structure, with collapse zones, fissure penetrating zones, and microfracture loosen zones appearing from the bottom to top. In addition, the movement and destruction of the overlying strata of the entire stope is an “elliptical arch.” Therefore, the results of similar simulation experiments and numerical simulation are basically consistent.

scholarly journals Study on Deformation and Failure Characteristics of Surrounding Rock of Overlying Roadway under Upward Mining in the Deep Mine

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Teng-Gen Xiong ◽  
Ju-Cai Chang ◽  
Kai He ◽  
Ya-Feng Su ◽  
Chao Qi
Keyword(s):  
Protective Layer ◽  
Failure Characteristics ◽  
Deformation And Failure ◽  
Deep Mine ◽  
Composite Failure ◽  
Working Face ◽  
Numerical Simulation Methods ◽  
The Impact ◽  
Two Sides ◽  
Upward Mining

To study the impact of mining of the lower protective layer on the deformation and failure characteristics of the upper roadway, these characteristics of an 879 gas drainage roadway were studied and analyzed during the mining of the II 1051 working face of the Zhuxianzhuang coal mine using similar simulation experiments and numerical simulation methods. The results indicate that with the continuous excavation of the working face, the range of impact of the mining stress gradually spreads and exceeds the level of the roadway. At the present time, the roadway is in a mining stress-rising area. The two sides of the roadway are sheared, and the roof and floor are under tension–shear composite failure. The floor is the most gravely damaged—the depth of its damage is 2.5 m, and the depths of damage on either side and of the roof are approximately 1–2 m. During the advancing process of the working face, the deformation of the roadway increases slowly at first, then increases sharply, and tends to be stable thereafter. The deformation of the floor is the largest, followed by those of the two sides and the roof; the values are 800, 400, and 300 mm, respectively.

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.

Investigation of rainfall-induced failure processes and characteristics of wedge slopes using physical models

2020 ◽  
Author(s):  
Chia-Ming Lo ◽  
Chen-Han Chu ◽  
Yi-Xiang Su
Keyword(s):  
Physical Modeling ◽  
Slope Failure ◽  
Wedge Angle ◽  
Physical Models ◽  
Small Scale ◽  
Intersection Angle ◽  
Failure Characteristics ◽  
Deformation And Failure ◽  
Free Falling ◽  
The Impact

<p>In this study, the small-scale physical modeling tests have considered the impact of the infiltration of rainfall in order to investigate the processes involved in wedge slope deformation and failure. We are conducted under controlled conditions of the intersection angle and half wedge angle. Observations obtained during each stage of deformation and failure were used to explain how gravity deformation varies on wedge slopes, and infer how rainfall influence slope failure. The results indicate that half wedge angle is a crucial factor in the deformation failure of slopes. The failure mechanisms of low intersection angle slopes (sliding model) differ considerably from those of high intersection angle slopes (free falling or toppling model). The infiltration of surface water can have a significant influence on rock layer deformation and the speed of failure. Details of the failure characteristics of wedge slope models are discussed in this paper.</p><p><strong>Keywords:</strong> physical modeling, rainfall, wedge slope, the intersection angle, half wedge angle.</p>

scholarly journals Land Subsidence Estimation for Aquifer Drainage Induced by Underground Mining

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4658
Author(s):  
Artur Guzy ◽  
Wojciech T. Witkowski
Keyword(s):  
Environmental Impact ◽  
Land Subsidence ◽  
Field Data ◽  
Underground Mining ◽  
Small Scale ◽  
Aquifer System ◽  
Maximum Value ◽  
The Impact ◽  
Method Model ◽  
Impact Of Mining

Land subsidence caused by groundwater withdrawal induced by mining is a relatively unknown phenomenon. This is primarily due to the small scale of such movements compared to the land subsidence caused by deposit extraction. Nonetheless, the environmental impact of drainage-related land subsidence remains underestimated. The research was carried out in the “Bogdanka” coal mine in Poland. First, the historical impact of mining on land subsidence and groundwater head changes was investigated. The outcomes of these studies were used to construct the influence method model. With field data, our model was successfully calibrated and validated. Finally, it was used for land subsidence estimation for 2030. As per the findings, the field of mining exploitation has the greatest land subsidence. In 2014, the maximum value of the phenomenon was 0.313 cm. However, this value will reach 0.364 m by 2030. The spatial extent of land subsidence caused by mining-induced drainage extends up to 20 km beyond the mining area’s boundaries. The presented model provided land subsidence patterns without the need for a complex numerical subsidence model. As a result, the method presented can be effectively used for land subsidence regulation plans considering the impact of mining on the aquifer system.

Stability analysis of high and steep slope considering excavation unloading effect

2010 ◽  
pp. 933-939
Author(s):  
Lehua Wang ◽  
Jianlin Li ◽  
Huafeng Deng ◽  
Mei Han ◽  
Qiufeng Huang
Keyword(s):  
Stability Analysis ◽  
Steep Slope ◽  
Unloading Effect ◽  
High And Steep Slope
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