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Collaborating Authors
Reservoir Description and Dynamics
Real-Time Roof Health Status Monitoring System in Depillaring Section of a Bord & Pillar Coal Mine Using Multi-hop Wireless Sensor Network (MWSN)
Bhattacharjee, Sudipta (Indian Institute of Technology, Kharagpur) | Deb, Debasis (Indian Institute of Technology, Kharagpur) | Pal, Samir K. (Indian Institute of Technology, Kharagpur)
ABSTRACT Roof falls are common problems of underground coal mines which may have serious effects on workers in the form of injury, disability or fatality as well as other damages like production downtimes, interruptions in mining operations, equipment breakdowns, etc. Currently there is no system in place for continuous monitoring of roof health status of an underground Bord & Pillar coal mine to forecast roof fall events. This paper addresses a multi-hop wireless sensor network (MWSN) based solution for real time monitoring of roof health status in an underground Bord & Pillar coal mine. The MWSN is a unique system developed for monitoring roof health status of underground coal mines. Based on obtained data, mine management would be able to take appropriate decision on roof fall events and notify the workers about the roof health status from time to time. The paper presents the performance of a wireless sensor network used for assimilating roof vibration data from underground to a surface computer and analyzes roof fall events from the monitored data.
- Data Science & Engineering Analytics > Information Management and Systems (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (0.69)
Cohesive Arch Action in Laterally Confined Block of Moist Sand Placing on an Inclined Bedding Plane
Pipatpongsa, Thirapong (Tokyo Institute of Technology) | Khosravi, Mohammad Hossein (Tokyo Institute of Technology) | Stathas, Dionysios (ETH Zurich) | Leelasukseree, Cheowchan (Chiang Mai University) | Takemura, Jiro (Tokyo Institute of Technology)
ABSTRACT In Mining Engineering, a stable arch formed across a pit provides benefit in design of undercut slope; therefore, prediction of the maximum undercut width which does not cause collapse is needed. This study extends a basic idealization of stationary system used by Jenike (1961) to the stability of laterally confined rigid block inclining on a stiff bedding plane. Similar assumptions on resistance supporting the arch is characterized by unconfined compressive strength and load breaking the arch is due to its own weight and force exerted by the material above the arch were adopted in the present study with an additional consideration of interface resistance.Moreover, a series of simple experiments using a block of compacted moist sand confined by parallel rigid walls were conducted with variation of thickness, width and length. The inclined angle of bedding plane was gradually increased until the block starts to slip. The relationship between a stable width and an inclined angle was obtained experimentally to confirm the developed theoretical relationship. For design purpose of undercut mining, this particular relationship provides a lower bound for the maximum span where load could laterally transferred to vertical planes of neighboring rock mass.
- Asia > Thailand (0.28)
- Europe > Switzerland (0.28)
- Geology > Geological Subdiscipline > Geomechanics (0.95)
- Geology > Geological Subdiscipline > Stratigraphy (0.83)
ABSTRACT In Japan, many of the slopes covered with shotcrete have aged considerably. Therefore, there is a risk that slope failures may occur due to the effects of factors such as seasonal weather patterns, natural disasters, climate change, heavy rainfall, and earthquakes. Therefore, it is important to develop a method for monitoring the stability and the durability of these slopes. In this paper, we propose a technique (hereafter referred to as "conversion analysis") that converts seismic velocity and electric resistivity data to porosity and saturation, which is then used to monitor weathering and groundwater fluctuation behind the slope. There have been several studies regarding the empirical relations between geophysical parameters such as seismic velocity and resistivity, and engineering properties such as porosity and saturation. At the investigation sites, seismic tomography and resistivity tomography were carried out between the ground surface and the boreholes. Investigation was conducted a total of 5 times, once in the summer and once in the winter for 3 years. As the results, it was possible to monitor the signs of seasonal variation and weathering in the ground.
- Geology > Rock Type (0.97)
- Geology > Structural Geology > Tectonics > Plate Tectonics > Earthquake (0.54)
ABSTRACT The optimum design of a pit requires the determination of the most economic pit limit which normally results in steep slope angles as in this way the excavation of waste is minimized. In general, as the slope angle becomes steeper, the stripping ratio is reduced and the mine economics improves. However, these benefits are counteracted by an increased risk to the operation. Thus the determination of the acceptable slope angle is a key aspect of the mining operation. The difficulty in determining the acceptable slope angle stems from the existence of uncertainties associated with the stability of the slopes. The uncertainty might be due to a random variability or lack of aspect knowledge. Field data collection and site investigations are used to reduce these uncertainties and to define the inherent natural variability. Effects of geomechanical property uncertainty on probability of slope failure are significant. In this paper Monte Carlo Simulation (MSC) method was selected to use for incorporating geomechanical property uncertainty in examining the probability of failure of the slope in Sungun Copper Mine (SCM) in Iran and Aitik Copper Mine (ACM) in Sweden.
- Europe > Sweden (0.51)
- Asia > Middle East > Iran (0.37)
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Mineral > Native Element Mineral > Copper (0.85)
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (1.00)
- Well Drilling > Wellbore Design > Wellbore integrity (0.82)
- Data Science & Engineering Analytics > Information Management and Systems (0.68)
ABSTRACT The paper discusses preliminary study on the effect of underground mining on large open pit slope stability in Mae Moh coalfield in Thailand. Mae Moh mine is currently operated as open pit mine and it is the largest open pit coal mine in Thailand. In the near future, however, the final pit limit of the mine will be reached and underground mining will be developed from the final highwall in the depth of 400โ600 from the surface. However, due to the adverse geological and geotechnical conditions, such as weak mechanical properties of rock, extra-thickness (20โ30 m) of coal seams, and huge final pit slope, various studies for underground mine are being carried out at the present. In this study, it was investigated for appropriate distance between open pit wall and underground mine, response of pit slope in different extent of rib pillars, which is measured horizontally minimum distance from the open pit wall to underground mine, and panels, and different mining height, and the interaction between open pit slope and underground working. The investigation was conducted by means of numerical techniques using three dimensional finite difference code FLAC3D.
- Reservoir Description and Dynamics > Reservoir Characterization (0.89)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Coal seam gas (0.65)
A New Attempt for Measuring In Situ Strain in Open-Pit Slope under Blasting Loads with FBG Sensors
Xu, Guoquan (Northeastern University, Beijing General Research Institute of Mining & Metallurgy) | Xiong, Daiyu (Beijing General Research Institute of Mining & Metallurgy) | Cao, Xiaoshuang (Beijing General Research Institute of Mining & Metallurgy) | Duan, Yun (Beijing General Research Institute of Mining & Metallurgy) | Zhang, Xin (Beijing General Research Institute of Mining & Metallurgy)
ABSTRACT For mining engineering research such as studies on blasting effects, it is require to monitor the slope's deformation continuously at locations as many as possible with a time on the degree of five years, which corresponds to the slope's deformation induced by blasting. Fiber Bragg Grating (FBG) sensors have evolved as the most commonly deployed fiber optic sensors, which are gaining increasing attention in the field of geotechnical engineering structural monitoring. These are proven to be more versatile due to their distinct advantages such as long life, immunity to electromagnetic interference, realizing real-time monitoring and remote sensing. This work focuses on the development and testing a technique used to measure open pit slope's deformation induced by blasting. This paper discusses the application of a fiber optic sensing system based on the FBG sensors to determine the effects of blast-induced open-pit slope's deformation. The preliminary result of this study shows that, surface pull wire in control point with the use of FBGs deformation of the slope can be monitored.
- Geology > Mineral (0.31)
- Geology > Geological Subdiscipline > Geomechanics (0.30)
- Energy > Oil & Gas > Upstream (0.95)
- Materials > Metals & Mining (0.73)
- Data Science & Engineering Analytics > Information Management and Systems (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization (0.70)
- Well Completion > Completion Monitoring Systems/Intelligent Wells > Downhole sensors & control equipment (0.57)
- Production and Well Operations > Well & Reservoir Surveillance and Monitoring > Production logging (0.49)
- Information Technology > Communications > Networks (0.72)
- Information Technology > Architecture > Real Time Systems (0.55)
ABSTRACT Biological stabilisation of dump slope is one of the widely used techniques for controlling erosion and stabilisation of dump slope to maintain the local climate conditions least affected. Vegetation physically and mechanically reinforces the dump material, resists erosion and reduces pore water pressure. It also provides some information about the slope movement. Dump materials are heterogeneous, anisotropic and behave neither like soil nor like rock. The modeling of such materials is difficult and continuum material and boundary conditions do not provide appropriate and accurate results. The present paper evaluates the effect of vegetation on dump slope stability for a given dump geometry through discrete modeling approach. The dump slope angle and height was kept constant at 37ยฐ and 60m respectively and its stability analyzed without and with vegetation cover. It was found that vegetation increases the stability of the slope as approximately 85.5% reduction in maximum displacement was observed. Hence, the bioremedial measures are better than the physical measures to protect the erosion and contamination more effectively and acceptable without deteriorating the surrounding ecological balance.
- Energy > Oil & Gas (0.32)
- Materials > Metals & Mining (0.31)
ABSTRACT It has been well known that the stability of slopes in the open pit coal mines in Indonesia does not remain constant over long periods of time. This has been mainly attributed to the weathering process that intensively occurs in the tropical regions. It is therefore appropriate to carry out a research of shear strength characteristics on rock samples of the predominant coal bearing strata such as sandstone which are obtained from Tutupan coal mines in South Kalimantan, Indonesia. The research includes the shear creep test with Generalized Kelvin model rheology approach with 15 ร 15 cm and 25 ร 25 cm sandstone samples size respectively. The research reveals that the long term strength of that sandstone is significantly lower than their peak strengths. It is also found that the Generalized Kelvin rheology model does fit to the rheology of these rock samples.
- Asia > Indonesia > Kalimantan (0.61)
- Asia > Indonesia > South Kalimantan (0.61)
- Geology > Rock Type > Sedimentary Rock > Organic-Rich Rock > Coal (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (0.55)
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (0.47)
ABSTRACT "Moshampa" is one of Iran's large dams under construction. The rock slopes facing the dam diversion tunnels failed during excavation. Site investigations and primary kinematic analyses showed that the mode of instability has been blocky toppling failure. The slope inclination was decreased and the portal was reconstructed with a new design. Since, according to the same investigations, the geological conditions of the rock mass in the portals of the power-house and diversion tunnels are similar, the slopes facing the dam power-house tunnels may also fail during excavation; so, they should be checked against blocky toppling failure. In this paper, a brief review of toppling failures of Moshampa dam has been given first. Then, the stability analyses of the portals of the diversion tunnels and their stabilization method have been checked by Goodman-Bray analytical approach under dry conditions. Finally, the stability of the slope, facing the portals of the power-house tunnels, has been checked against blocky toppling by the method and its stable inclination computed.
- Reservoir Description and Dynamics > Reservoir Characterization (0.71)
- Data Science & Engineering Analytics > Information Management and Systems (0.47)
ABSTRACT Dump slope stability is an important activity in the life of an opencast mine. This is because of the safety to mine, machine and personnel as well as economic impact on production. In this paper, stability of an existing dump is analyzed using analytical method. The waste dump material properties are determined in the laboratory like the cohesion, angle of internal friction, permeability, bulk density, grain density, particle size distribution and in-situ moisture content. The stability of the dump slope is simulated for two extreme conditions like a very dry and a wet condition. Analysis shows that the effects of water on dump stability more prominent than its bulk density. In these situations, it is pertinent to use the slope stability measures or change the dump profile for better dump stability.
- Energy > Oil & Gas > Upstream (1.00)
- Water & Waste Management > Solid Waste Management (0.84)
- Reservoir Description and Dynamics > Formation Evaluation & Management (0.89)
- Reservoir Description and Dynamics > Reservoir Characterization (0.67)