scholarly journals Numerical simulation of the possibility of seismic event occurrence in hard rock mine

2020 ◽  
Vol 609 ◽  
pp. 012084
Author(s):  
Karolina Adach-Pawelus ◽  
Jan Butra
Keyword(s):  
Numerical Simulation ◽  
Seismic Event ◽  
Hard Rock ◽  
Event Occurrence

scholarly journals Numerical Simulation on Cutting and Fracturing of Rock Plate with One Side Fixed and Three Sides Free

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Zhenguo Lu ◽  
Qingliang Zeng ◽  
Zhaosheng Meng ◽  
Zhiwen Wang ◽  
Guanshun Gao
Keyword(s):  
Numerical Simulation ◽  
Cutting Force ◽  
Cutting Tool ◽  
Hard Rock ◽  
Rock Fracture ◽  
Rock Fragment ◽  
Conical Pick ◽  
Cutting Angle ◽  
Saw Blade ◽  
Element Erosion

Conical pick is a rock cutting tool that is commonly used in roadway driving. Pick wear frequently happens in the course of breaking hard rock. The current paper shows a new method to solve the problem of pick wear. The rock is preslit with the saw blade and then broken by the conical pick. In order to study the cutting force and features of rock fragment, the numerical model is built between rock plate and conical pick. And element erosion is added in the code to obtain the fracture result. The rock plate cutting testbed is made to testify the correctness of numerical simulation. The width, height, and thickness of the rock plate, as well as cutting angle and cutting position, which influence cutting force and rock fracture are studied. According to the results, there exist exponential relationships between cutting force and width and thickness of rock plate. In addition, a linear relationship is found between the cutting force and the height of rock plate. Furthermore, both the cutting angle and cutting depth have an influence on cutting force. In particular, the factors of thickness and height or rock plate have the most obvious influence on cutting force. It is proven that what is beneficial to rock fracture is higher height and lower thickness of rock plate.

scholarly journals Diurnal seismicity cycle linked to subsurface melting on an ice shelf

2018 ◽  
Vol 60 (79) ◽  
pp. 137-157 ◽  
Author(s):  
Douglas R. MacAyeal ◽  
Alison F. Banwell ◽  
Emile A. Okal ◽  
Jinqiao Lin ◽  
Ian C. Willis ◽  
...  
Keyword(s):  
Seismic Event ◽  
Austral Summer ◽  
Surface Air Temperature ◽  
Water Layer ◽  
Ice Shelf ◽  
Thermally Induced ◽  
One Dimensional ◽  
Fractured Medium ◽  
Flexural Gravity Waves ◽  
Event Occurrence

ABSTRACTSeismograms acquired on the McMurdo Ice Shelf, Antarctica, during an Austral summer melt season (November 2016–January 2017) reveal a diurnal cycle of seismicity, consisting of hundreds of thousands of small ice quakes limited to a 6–12 hour period during the evening, in an area where there is substantial subsurface melting. This cycle is explained by thermally induced bending and fracture of a frozen surface superimposed on a subsurface slush/water layer that is supported by solar radiation penetration and absorption. A simple, one-dimensional model of heat transfer driven by observed surface air temperature and shortwave absorption reproduces the presence and absence (as daily weather dictated) of the observed diurnal seismicity cycle. Seismic event statistics comparing event occurrence with amplitude suggest that the events are generated in a fractured medium featuring relatively low stresses, as is consistent with a frozen surface superimposed on subsurface slush. Waveforms of the icequakes are consistent with hydroacoustic phases at frequency $ {\bf \gt} \bf 75\,{\bf Hz}$ and flexural-gravity waves at frequency $ \bf {\bf \lt}25\,{\bf Hz}$. Our results suggest that seismic observation may prove useful in monitoring subsurface melting in a manner that complements other ground-based methods as well as remote sensing.

Research on the Surrounding Rock Damage of Deep Hard Rock Tunnels Caused by Bottom Excavation

2012 ◽  
Vol 170-173 ◽  
pp. 1700-1703
Author(s):  
Zhen Wang ◽  
Chu Nan Tang ◽  
Tian Hui Ma ◽  
Lian Chong Li ◽  
Yue Feng Yang
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Hard Rock ◽  
Surrounding Rock ◽  
Rock Damage ◽  
Simulation Approach ◽  
High Geostress ◽  
Intact Rock Mass ◽  
Rock Tunnels ◽  
Rock Tunnel

The damage features of surrounding rock in the process of bottom excavation in deep hard rock tunnel were investigated, combining with the actual tunnel data of JinpingⅡHydropower Station and using numerical simulation approach. The evolution mechanism of microfractures initiation, growth and expansion in deep intact rock mass was performed. It’s shown that the fractures caused by bottom excavation develop to deeper surrounding rock due to stress adjustment, and the zone that have been supported also has some damage. The research results provide important references to understand the damage features of surrounding rock in deep hard rock under high geostress.

scholarly journals Rock Breaking by Conical Pick Assisted with High Pressure Water Jet

2014 ◽  
Vol 6 ◽  
pp. 868041 ◽  
Author(s):  
Liu Songyong ◽  
Chen Junfeng ◽  
Liu Xiaohui
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
Hard Rock ◽  
Rock Breaking ◽  
Water Jet ◽  
Cutting Efficiency ◽  
Conical Pick ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Better Than

In the process of hard rock breaking, the conical pick bears great cutting force and wear, and the cutting efficiency is lower. Thus different combination ways of water jet and conical pick were proposed to solve this issue; for instance, water jet placed in the front of pick (JFP) and water jet through the center of pick (JCP) was researched by numerical simulation and experiments in this paper. First, the models of rock breaking were built based on SPH combined with finite element method. Then, the stress distribution of rock and the cut force of pick were analyzed when the rock broken by the conical pick assisted with the high pressure water jet. It indicates that the effect of the JCP on rock breaking is better than the JFP. At last, experiments about rock breaking with a conical pick and the JCP were conducted to verify the reliability of the simulation. It indicates that the rock breaking with the assistance of high pressure water jet cannot only reduce the pick force, but also increase the rock crushing volume.

A method for numerical simulation based on microseismic information and the interpretation of hard rock fracture

2019 ◽  
Vol 164 ◽  
pp. 214-224 ◽  
Author(s):  
Chunchi Ma ◽  
Tianbin Li ◽  
Hang Zhang ◽  
Yupeng Jiang ◽  
Tao Song
Keyword(s):  
Numerical Simulation ◽  
Hard Rock ◽  
Rock Fracture ◽  
Simulation Based

Seepage Numerical Simulation Methods of Hard Fractured Rock Mass

2013 ◽  
Vol 423-426 ◽  
pp. 1330-1333
Author(s):  
Gang Lei
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Permeability Coefficient ◽  
Hard Rock ◽  
Fractured Rock ◽  
Triaxial Compression ◽  
Equivalent Plastic Strain ◽  
Simulation Method ◽  
Numerical Simulation Methods ◽  
Fissure Water

According to the seepage action of hard rock fissure water, a numerical simulation method is proposed in this paper. The basic mechanical properties for rock mass changed significantly during the process of secondary stress adjustments, and the rock deterioration constitutive model (RDM) can accurately reflect both the abruptness of the rock yield failure and the changes of mechanical parameters after yield. On the basis of RDM, the permeability coefficient with equivalent plastic strain function was introduced in this method which can update the permeability coefficient, and carried out numerical simulation on hard rock fissure water seepage action by FLAC3D. The results of the seepage triaxial compression experiment proved the rationality of the method.

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