scholarly journals Discussion on a methodology for the digital reconstruction of complex fault structures in coal mines

2021 ◽  
Author(s):  
Hongwei Wang ◽  
Zeliang Wang ◽  
Yaodong Jiang ◽  
Jiaqi Song
Keyword(s):  
Coal Mine ◽  
Field Data ◽  
Physical Field ◽  
Digital Model ◽  
Fault Structure ◽  
Digital Reconstruction ◽  
Complex Fault ◽  
Prediction And Prevention ◽  
Geological Conditions ◽  
Fault Structures

Abstract The visualization of complex geological structures can provide technical support for accurate prediction and prevention of coal mine disasters. Taking fault structure as an example, this study proposes a new digital reconstruction method to realize the visualization of geological structure. The methodology for the digital reconstruction of complex fault structures is composed by the following four aspects, including collection and fidelity of multi-physical field data of fault structure, transmission of multi-physical field data, multi-physical data normalization and digital model of fault structures. The key scientific issues of this methodology to be resolved includes in-situ fidelity of multi-field data and normalized programming of multi-source data. In addition, based on the geological conditions in Da 'anshan coal mine in the mining area of western Beijing, China, this paper makes a preliminary attempt to establish a digital model of fault and fold structures by this methodology.

Development Features and Fractal Research of Fault Structure of No.5 Coal Seam in Chenghe-Second Coal Mine

2014 ◽  
Vol 580-583 ◽  
pp. 862-865
Author(s):  
Xi Cheng Xue ◽  
Jia Wang
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Underground Mining ◽  
Self Similarity ◽  
Fault Structure ◽  
Development Feature ◽  
Fractal Statistics ◽  
Fault Structures ◽  
Fractal Characteristics ◽  
Plane Distribution

Based on the collected geological exploration and underground mining data, this thesis has analyzed the development feature of faults of No.5 coal seam in Chenghe-Second coal mine and obtained fractal law of fault structure by fractal statistics. The result shows that the faults have a good self-similarity on the plane distribution and obvious fractal characteristics and that the larger the fractal dimension, the higher the complex degree of fault structures.

Water Controlling Research of Complex Fault Structures in Wugou Mine

2012 ◽  
Vol 616-618 ◽  
pp. 499-504
Author(s):  
Wen Quan Zhang ◽  
Wei Li ◽  
Guang Peng Zhang ◽  
Gui Bin Zhang
Keyword(s):  
Water Level ◽  
Mine Water ◽  
Water Movement ◽  
Weak Link ◽  
Water Pressure ◽  
Water Inrush ◽  
Normal Faults ◽  
Fault Structure ◽  
Geological Conditions ◽  
Fault Structures

Once the lead abutment pressure influence the fault structure, its internal rock mass is damaged easily while the fault structures are the most vulnerable of mining influence weak link. If the fault structures conduct the aquifer, the mine water inrush will occur. This paper researchs water level of Taiyuan limestone aquifer with three-dimensional form simulation and analyzes mine water movement characteristics and the change of water level and hydraulic contact of each aquifer combining with complex geological conditions of Wugou mine, aiming at tectonic evolution and tectonic combination characteristic of the mine, according to the long observation hole material. Combining with water pressure test results and drilling and geophysical prospecting achievement, using daubing coefficient method to analyze sealing of fault structure, we conclude that faults are pressure-torsional normal faults which their fault zone is compact and has high strength so we can narrow even do not leave set fault waterproof pillar in Wugou mine.

scholarly journals Engineering geological conditions of Klokova mountain, Greece.

2013 ◽  
Vol 47 (4) ◽  
pp. 1872
Author(s):  
H. Saroglou ◽  
N. Kazilis
Keyword(s):  
Strong Earthquake ◽  
Field Data ◽  
Seismic Loading ◽  
Geological Mapping ◽  
Risk Level ◽  
Rock Slopes ◽  
Geological Conditions ◽  
Geotechnical Investigations ◽  
Fault Structures ◽  
Very High

The paper presents the engineering geological conditions of Klokova Mountain and discusses the problems, which relate with the presence of fault structures, karst features and steep rock slopes in relation to the existing and planned motorway. The engineering geological setting of the limestone formations is characterized by the development of karst and the fault presence. The karst pattern and an interpretation of the fault geometry of the area are presented based on geological mapping. Additionally, rockmass conditions are presented based on field data and borehole findings. The geotechnical conditions have been assessed by geotechnical investigations, which were executed for the design of the new highway. Finally, a risk assessment of the area due to rockfalls is presented, considering that the risk level is very high due to the presence of very steep and fractured slopes, formed partially parallel to fault surfaces, and the high seismicity of the broader area. Rockfall episodes are prone to occur under seismic loading during a strong earthquake in the area but also due to high rainfall incidents.

Reasonable Entry Layout of Lower Seam in Multi-Seam Mining Based on Numerical Simulation

2013 ◽  
Vol 295-298 ◽  
pp. 2980-2984
Author(s):  
Xiang Qian Wang ◽  
Da Fa Yin ◽  
Zhao Ning Gao ◽  
Qi Feng Zhao
Keyword(s):  
Numerical Simulation ◽  
Stress Distribution ◽  
Coal Seam ◽  
Coal Mine ◽  
Abutment Pressure ◽  
Surrounding Rock ◽  
Geological Conditions ◽  
Seam Mining

Based on the geological conditions of 6# coal seam and 8# coal seam in Xieqiao Coal Mine, to determine reasonable entry layout of lower seam in multi-seam mining, alternate internal entry layout, alternate exterior entry layout and overlapping entry layout were put forward and simulated by FLAC3D. Then stress distribution and displacement characteristics of surrounding rock were analyzed in the three ways of entry layout, leading to the conclusion that alternate internal entry layout is a better choice for multi-seam mining, for which makes the entry located in stress reduce zone and reduces the influence of abutment pressure of upper coal seam mining to a certain extent,. And the mining practice of Xieqiao Coal Mine tested the results, which will offer a beneficial reference for entry layout with similar geological conditions in multi-seam mining.

scholarly journals Substantiation of Safe Conditions During Undermining of Hydraulic Waste Disposal

2018 ◽  
Vol 41 ◽  
pp. 01007
Author(s):  
Yuriy Kutepov ◽  
Aleksandr Mironov ◽  
Maksim Sablin ◽  
Elena Borger
Keyword(s):  
Rock Mass ◽  
Waste Disposal ◽  
Coal Mine ◽  
Water Body ◽  
Water Inflow ◽  
Open Pit ◽  
Coal Seams ◽  
Geological Conditions ◽  
Mine Workings ◽  
Mine Dump

This article considers mining and geological conditions of the site “Blagodatny” of the mine named after A.D. Ruban located underneaththe old open pit coal mine and the hydraulic-mine dump. The potentially dangerous zones in the undermined rock mass have been identified based onthe conditions of formation of water inflow into mine workings. Safe depthof coal seams mining has been calculated depending on the type of water body – the hydraulic-mine dump.

scholarly journals Research on Automatic Construction Method of Three-Dimensional Complex Fault Model

Minerals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 893
Author(s):  
Chi Zhang ◽  
Xiaolin Hou ◽  
Mao Pan ◽  
Zhaoliang Li
Keyword(s):  
Three Dimensional ◽  
Geological Structure ◽  
Fault Model ◽  
Construction Method ◽  
Model Construction ◽  
Automatic Construction ◽  
Complex Fault ◽  
Resource Exploration ◽  
Fault Structures ◽  
Manual Interaction

Three-dimensional complex fault modeling is an important research topic in three-dimensional geological structure modeling. The automatic construction of complex fault models has research significance and application value for basic geological theories, as well as engineering fields such as geological engineering, resource exploration, and digital mines. Complex fault structures, especially complex fault networks with multilevel branches, still require a large amount of manual participation in the characterization of fault transfer relationships. This paper proposes an automatic construction method for a three-dimensional complex fault model, including the generation and optimization of fault surfaces, automatic determination of the contact relationship between fault surfaces, and recording of the model. This method realizes the automatic construction of a three-dimensional complex fault model, reduces the manual interaction in model construction, improves the automation of fault model construction, and saves manual modeling time.

Study on Stability for Intersection of Deep Soft Rock Roadway

2011 ◽  
Vol 243-249 ◽  
pp. 2666-2669
Author(s):  
Zhan Jin Li ◽  
Yang Zhang ◽  
Xue Li Zhao
Keyword(s):  
Coal Mine ◽  
Soft Rock ◽  
Intersection Problem ◽  
The Third ◽  
Geological Conditions ◽  
Control Stability ◽  
Soft Rock Roadway ◽  
Crossing Point ◽  
Coupling Support ◽  
Rock Roadway

With the depth increasing continuously, more complicated of geological conditions, will make intersection in deep soft rock roadway is very difficult to support. In order to solve the intersection problem of difficult to support, combined with the third levels of the Fifth Coal Mine of Hemei, the coupling supporting design—anchor-mesh-cable + truss to control stability of crossing point—is proposed. Based software of FLAC3D, simulate the program applicable in deep soft rock roadway intersection. Application results show that the coupling support technology of anchor-mesh-cable + truss can effectively control the deformation of intersection in deep soft rock roadway.

scholarly journals Reference P-wave velocity in coal seams at great depths in Jastrzebie coal mine

2019 ◽  
Vol 133 ◽  
pp. 01011
Author(s):  
Jakub Kokowski ◽  
Zbigniew Szreder ◽  
Elżbieta Pilecka
Keyword(s):  
Wave Velocity ◽  
Coal Mine ◽  
Velocity Model ◽  
P Wave ◽  
Coal Seams ◽  
Data Set ◽  
Seismic Profiling ◽  
Reference Velocity ◽  
P Wave Velocity ◽  
Geological Conditions

In the study, the determining of the reference velocity of the P-wave in coal seams used in seismic profiling to assess increases and decreases in relative stresses at large depths has been presented. The seismic profiling method proposed by Dubinski in 1989 covers a range of depth up to 970 m. At present, coal seams exploitation in Polish coal mines is conducted at greater depths, even exceeding 1200 m, which creates the necessity for a new reference velocity model. The study presents an empirical mathematical model of the change of the P-wave velocity in coal seams in the geological conditions of the Jastrzebie coal mine. A power model analogous to the Dubinski’s one was elaborated with new constants. The calculations included the results from 35 measurements of seismic profiling carried out in various coal seams of the Jastrzebie mine at depths from 640 to 1200 m. The results obtained cause changes in the result of calculations of seismic anomalies. Future validation of the proposed model with larger data set will be required.

scholarly journals Dynamic Monitoring of the Water Flowing Fractured Zone during the Mining Process under a River

2018 ◽  
Vol 9 (1) ◽  
pp. 43 ◽  
Author(s):  
Shuai Chang ◽  
Zhen Yang ◽  
Changfang Guo ◽  
Zhanyuan Ma ◽  
Xiang Wu
Keyword(s):  
Water Flow ◽  
Coal Mine ◽  
Water Inrush ◽  
Unconfined Aquifer ◽  
Coal Extraction ◽  
Fractured Zone ◽  
Transient Electromagnetic ◽  
Geological Conditions ◽  
Longwall Panel ◽  
Flow Mechanisms

The hydrogeological conditions of coal mines in China are quite complex, and water inrush accidents occur frequently with disastrous consequences during coal extraction. Among them, the risk of coal mining under a river is the highest due to the high water transmissivity and lateral charge capacity of the unconfined aquifer under the river. The danger of mining under a river requires the accurate determination of the developmental mechanisms of the water flowing fractured zone (WFFZ) and the water flow mechanisms influenced by the specific geological conditions of a coal mine. This paper first used the transient electromagnetic (TEM) method to monitor the development of the WFFZ and the water flow mechanisms following the mining of a longwall face under a river. The TEM survey results showed that the middle Jurassic coarse sandstone aquifer and the Klzh unconfined aquifer were the main aquifers of the 8101 longwall panel, and the WFFZ reached the aquifers during the mining process. Due to the limited water reserves in the dry season, the downward flowing water mainly came from the lateral recharge in the aquifer. The water inrush mechanisms of the 8101 longwall panel in Selian No.1 Coal mine were analyzed based on the water flow mechanisms of the aquifer and the numerical simulation results. This provides theoretical and technical guidance to enact safety measures for mining beneath aquifers.

scholarly journals Research on Mechanism and Control of Floor Heave of Mining-Influenced Roadway in Top Coal Caving Working Face

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 381 ◽  
Author(s):  
Xingping Lai ◽  
Huicong Xu ◽  
Pengfei Shan ◽  
Yanlei Kang ◽  
Zeyang Wang ◽  
...  
Keyword(s):  
Coal Mine ◽  
High Efficiency ◽  
Soft Rock ◽  
Surrounding Rock ◽  
High Yield ◽  
Geological Investigation ◽  
Geological Conditions ◽  
Floor Heave ◽  
Damage Depth ◽  
Squeeze Effect

The stability of the surrounding rock is the key problem regarding the normal use of coal mine roadways, and the floor heave of roadways is one of the key factors that can restrict high-yield and high-efficiency mining. Based on the 1305 auxiliary transportation roadway geological conditions in the Dananhu No. 1 Coal Mine, Xinjiang, the mechanism of roadway floor heave was studied by field geological investigation, theoretical analysis, and numerical simulation. We think that the surrounding rock of the roadway presents asymmetrical shrinkage under the original support condition, and it is the extrusion flow type floor heave. The bottom without support and influence of mining are the important causes of floor heave. Therefore, the optimal support scheme is proposed and verified. The results show that the maximum damage depth of the roadway floor is 3.2 m, and the damage depth of the floor of roadway ribs is 3.05 m. The floor heave was decreased from 735 mm to 268 mm, and the force of the rib bolts was reduced from 309 kN to 90 kN after using the optimization supporting scheme. This scheme effectively alleviated the “squeeze” effect of the two ribs on the soft rock floor, and the surrounding rock system achieves long-term stability after optimized support. This provides scientific guidance for field safe mining.

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