Proceedings of the 9th China-Russia Symposium "Coal in the 21st Century: Mining, Intelligent Equipment and Environment Protection" (COAL 2018)

Session: Mining

31 articles
Proceedings Article

Height Prediction of Water Flowing Fractured Zone and Thickness Effect of Long Wall Caving in Thick Loose Seam with Weak Cementation

Yao Lu, Changxiang Wang, Wenbo Wang, Chuanping Sun, Buchu Zhang
Based on the transfer rock beam theory and the mining overburden movement theory, the height prediction methods of collapse zone and fracture zone under different lithologic conditions are deduced according to the characteristics of rock mass dilatation and rock strata combined motion. Furthermore, the...
Proceedings Article

Time-frequency Characteristics of Micro-seismic Signals Before and after Rock Burst

Xinxin Wang, Shijian Yu, Dawei Yin
In this paper, the time-frequency characteristics of micro-seismic signals before and after the rock burst occurred in the 1300 working face of a coal mine in eastern China were analyzed. The results show that before rock burst occurrence, the amplitude was small with gentle vibration fluctuations. And...
Proceedings Article

Study on the Water Inrush of the Underplate in the Mining Process of Kuting Coal Mine

XingLin Wen, RuMeng Wang, Yao Wang
Based on mining in working face floor karst collapse column, the damage of surrounding rock and the water inrush of GeTing coal floor of concealed karst collapse column as the research object, using numerical simulation software FLAC3D for mining stress field and plastic failure zones in the process...
Proceedings Article

Evolution Characteristics of Rock Burst Danger Mining in Syncline Environment

Shitan Gu, Bangyou Jiang, Ruifeng Huang, Zhimin Xiao
Based on the theory of Winkler beam on elastic foundation, mechanical model of syncline genesis was established and deflections, bending moment and strain energy were deduced. Meanwhile, stress and energy conditions mining in syncline structure were analyzed from the point of formation mechanism of syncline...
Proceedings Article

Experimental Research on the Effect of Initial Temperature Coupled with Ignition Energy on the Gas-air Mixture Explosive Limits

Yansong Zhang, Xiangbao Meng, Bo Liu, Wenzhou Du, Jie Zhang
In order to study the effect of different initial conditions on gas explosive limits, the gas explosive limits have been measured under different initial temperatures(50~200℃)coupled with different ignition energies(50~800J). Besides, it has been obtained that the change rules of the upper and lower...
Proceedings Article

A New Bumping Danger Warning Method Based on the Growth Trend of Drilling Cutting Quantity

Zhongcheng Qin, Tan Li, Guangbo Chen, Bin Cao, Yuteng Liu
The method of drilling bits is a common method to predict the rockburst. This method establishes a quantitative relationship between the drilling cutting quantity and the stress in coal body. But in the process of mining, the common early warning indicator often has some disadvantages such as limitation...
Proceedings Article

Progress in Research of Characterization Methods for Pore and Fissure Structures in Coal

Gang Wang, Junnan Shen, Xiangjie Qin, Dongyang Han
The pore and fissure of coal directly affect the occurrence and seepage of gas. Therefore, it coal seam methane should be developed for utilization and gas control. In this study, characterization methods for coal fractures are introduced on the basis of extensive literature research. They are usually...
Proceedings Article

Application and Development on Coal Mine Backfill Mining Technologies in China

Xinguo Zhang, Jinxiao Liu, Feifan Li, Gaoshang Wang, Wenqiang Zuo
The rapid development of backfill mining technologies were reviewed in Chinese coal mines from the 2002 to 2012 in Chinese coal mines. Some field engineering applications were introduced, the main data was collected from 27 typical backfill mining working face, including geology survey, mining setting,...
Proceedings Article

The Injectability of the Advanced Inhibiting Coal Seam and the Effect of Inhibitor Injection

Yansong Zhang, Qingxin Xie, Xiangbao Meng, Bo Liu
In order to study the injectability of the advanced inhibiting coal seam and the effect of inhibitor injection, taking the 3 upper coal seam in Nantun mine as an example, on the basis of the fact that this coal seam can be injected, the experiment of pressurized water absorption for coal in 9 different...
Proceedings Article

Impact Hazard Assessment of Mine Roadway Excavation in Fault and Karst Erosion Area

Zenghui Zhao, Xiaojie Gao, Qing Ma
The evaluation method of impact hazard during the recovery of the working face is mature, but the evaluation indexes or factors considered by these methods are difficult to apply to the risk analysis of roadway excavation in the areas with faults and karst. Therefore, the fuzzy comprehensive evaluation...
Proceedings Article

Laboratory Study on the Propagation of Horizontal Edge Cracks in Rock-like Material

Baoliang Zhang, Baotang Shen, Shaojie Chen, Xizhen Sun
Rock fracture propagation is a major hazard for mining and tunnel excavation in fractured rock masses or coal seams. This paper describes a study of investigating the mechanisms and pathways of rock fracture under uniaxial compression. A rock-like material which consists of model gypsum, water and diatomaceous...
Proceedings Article

Energy Mechanism of Rock Burst in the Rock-Coal Combined Body

Shaojie Chen, Dawei Yin, Ning Jiang, Zhen Zhang, DongMei Huang
Rock burst hazards during deep mining are a dynamic phenomenon of the sudden release of elastic energy aggregated in the roof rock-coal combined body. In this paper, the occurrence mechanism of rock burst for roof rock-coal combined body was studied through energy dissipation theory. And the elastic...
Proceedings Article

A Research on the Methods for Prediction of the Slope Stability of Open-pit Mine

Xiwen Feng, Yue Guo, Junyong Li
In order to improve the slope stability of open-pit mine, this paper proposed four prediction methods BP (Back Propagation)Neural Network, Naive Bayes Classifier, Decision Tree and Support Vector Machine for predicting the classification of slope stability of open-pit mine.Firstly, the sample data of...
Proceedings Article

Development of Water Flowing Fractured Zone Caused by Fully Mechanized Top Coal Caving in Xin’an Coal Mine

Changxiang Wang, Ning Jiang, Yao Lu, Buchu Zhang, Wenbo Wang, Chuanping Sun
Taking Xin’an coal mine as an example, through empirical formula, regional analogy, theory analysis and analog simulation experiment, predicted the high of water flowing fractured zone under the condition of fully mechanized top coal caving, used monitoring system to measure the height of water flowing...
Proceedings Article

Numerical Analysis of the Effect of Tunnel Advance Support on Surrounding Rock Stability

Zhitao Ma, Xinpeng Wang, Yachao Yang, Yongqiang Cui
The purpose of this paper is to study the effect of advance support on the stability of tunnel surrounding rock using the numerical analysis. For this, three different cases, such as without support, pipe shed grouting support, and advance small pipe grouting support were calculated and analyzed. The...
Proceedings Article

Numerical Simulation of Building Foundation Stability above Old Longwall Goaf

Ning Jiang, Shaojie Chen, Dawei Yin, Xikun Chang, Weijia Guo
In orderto analyze and evaluate the residual deformation of longwall goaf and its effect on new buildings, the stability of building foundation above the old longwall goaf was studied using the FLAC3D software. According to the results of probability integral method, the mechanical parameters of the...
Proceedings Article

Numerical Study on the Mechanism of Water Inrush by Floor Damage and Fault Activation during Longwall Mining

Peisen Zhang, Wei Yan, Wenquan Zhang, Hao Wang
This study evaluated the damage and fracture patterns in mine floors and the fault activation caused by longwall mining, as well as the associated effects on mine water inrush. Numerical simulations were used for this evaluation. The results indicated that higher water pressures in confined aquifers...
Proceedings Article

Relationships between Field, Experimental Strengths or Their Ratios and Excavating Depths of Rock Masses in Datun Coal Mining Area

Chuanxiao Liu, Yongjie Yang, Depeng Ma, Maotong Li, Baihui Xue
By experimental results for mudstone under the seventh coal seam and sand mudstone of the eighth coal seam in Datun mining area, their uniaxial compression strengths have no relationship with mining depth. Field compression strengths of these strata are not only no more than their experimental strengths,...
Proceedings Article

Research on Reasonable Lag Time of Gob-side Entry Driving in Deep Mine Based on On-line Monitoring of Lateral Stress and Deformation of Working Face

Luyi Xing, Yongjie Yang, Jiakun Lv, Haiyu Ji, Yandong Zhang
The determination of reasonable lag time is the key to make the gob-side entry driving away from the violent mining of the working face. In this paper, the geological and mining conditions of the No.7432 Working Face in Kongzhuang Coal Mine is taken as the research background. Using an independently...
Proceedings Article

Research on Surrounding Rock Control Technology of Roadway Excavated in Residual Coal Pillar

Donghai Jiang, Tongxu Wang, Mingguang Zhang, Yuanjie Wang
In order to research surrounding rock control technology of roadway excavated in residual coal pillar, this article took excavation roadway in coal pillar that was between the two parallel empty roadways as the research background , used field investigation, theoretical analysis and calculation, similar...
Proceedings Article

Extension of Water Flowing Fractured Zone during Coal Seams Mining in No.1 Mine of Tashendian Area

Qinghai Li, Tongbin Zhao, Zhen Li, Jingkai Li
In coal seams mining in No. 1 mine of Tashendian area, three methods of theoretical analysis, UDEC numerical simulation, and physical simulation test were used in this research to analyze the extension height of water flowing fractured zone and the height of waterproof coal (rock) pillar. By calculation,...
Proceedings Article

Study on the Method of Prevention and Control of Dynamic Disasters in Isolated Island Face

Jian Hao, Jun Chen, Yongkui Shi
In order to study the safe mining method of isolated island coal face, the stratum movement and stress condition of the island's working area are analyzed theoretically, and the criterion of safe mining in isolated island coal face was put forward. The paper holds that rational mining parameters can...
Proceedings Article

Steam Gasification of Bituminous Coals with CaO Additives

S.S. Azikhanov, E.K. Nepomnyashchikh, A.R. Bogomolov
The results of experimental studies on steam oxygen-free gasification of carbonized coal in a dense layer with addition of calcium oxide. The effect of the amount of added calcium oxide on the process rate and composition of produced gas was determined. The possibility of adjusting the hydrogen/carbon...
Proceedings Article

Analysis of Studies of the Rock Pressure Manifestations During the Development of the New Kuzbass Seams

Nikolai Bedarev, Oleg Lyubimov, Nikolai Kovalev, Natalya Grigoryeva
Based on the analysis of studies in domestic and abroad practice it is defined that the accumulated experience is a subject to significant adjustment in conditions of new Kuzbass coal deposits (Erunakovskoe, Kazankovskoe and others.). There is a comparison between the obtained measurements of the manifestation...
Proceedings Article

Application of the Numerical Method for the Purposes of the Coal Pillars Failure Zones Estimation with Respect to Excessive Deformation

Inna Ermakova, Natalya Pirieva
The methodology for calculating the dimensions of failure zones in coal pillars is proposed. The suggested approach is based on the finite element method, taking into consideration excessive deformation of coal seam, and compressive strength of coal. The estimation algorithm is suggested for the failure...
Proceedings Article

Directional Hydraulic Fracturing Application for Reduction of Rock Heaving Intensity in the Development Opening under Conditions of S.M. Kirov Mine

Vladimir Klishin, Gleb Opruk, Alexander Ponizov
The article reveals the application experience of directional hydraulic fracturing to reduce rock heaving intensity in the development opening of the following longwall face. The authors developed a scheme of roof weakening at longwall exit from the installation chamber. It also helps prevent rock heaving...
Proceedings Article

Research of the Breakdown Rock Mass Parameters Under Conditions of the Transportless Mining System

Valery Kolesnikov, Vctor Martyanov, Eugene Makridin, Alexander Katsubin
Intensive mining in the Kuzbass region (Russia) and high environmental impact imply the development of both energy saving and environmental saving technologies. One of the directions is the decrease in the use of heavy vehicles via the non-transport flat seams mining. At the same time to increase the...
Proceedings Article

Defining the Excavated Layer’s Height for Coal Extraction by Backhoes

Oleg Litvin, Maxim Tyulenev, Sergey Zhironkin, Sergey Markov
Currently, large machine building companies produce hydraulic excavators serially with a wide range of operating parameters (bucket capacity, digging radius, digging depth and height). Hydraulic excavators have found wide application in quarries all over the world (USA, France, England, Japan, Australia,...
Proceedings Article

The Theory of Control of Stressed States of a Block Rock Massif with Regard to the Hierarchy of its Movements

A.N. Solovitskiy, V.V. Pershin
It is established that taking into account the development of geodynamic and technogenic processes in the development of the Kuzbass subsoil is an actual and multifaceted problem. Its solution is impossible without the creation of new models of deformations of blocks of the earth's crust. These processes...
Proceedings Article

Increase of the Frame Support Yield Load by Full Filling of Behind-Anchoring Space with Grout Material

Viktor Tatsienko, Alexander Liskovets, Maxim Sablin
The article presents brief description and results of laboratory and in-situ tests of frame support with backfilling of behind-anchoring space with grout. Characteristics of mining and geological conditions on the site of inclined conveyor shaft of Sychevskiy-I mine-section, A.D. Ruban Mine (JSC SUEK-Kuzbass)...
Proceedings Article

Reliability Analysis for Bolt-shotcrete Support System in Underground Tunnels

Guangchao Zhang, Chuanwe Zang, Zhijie Wen, Bangyou Jiang, Feng Wang
Reliability analysis of bolt-shotcrete support system is essential for the stability control of the underground tunnels. This paper presented a new analytical method for the reliability analysis of bolt-shotcrete support system. Considering the difference of the stiffness of each support unit, the bolt-shotcrete...