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Roadway support technology of high rock burst risk area under complex mining conditions

Electronic Journal of Geotechnical engineering 2015年第20期20卷 11635-11645页

作者： Hengjie, Luan Zeyu, Chen Chuanyang, Jia Guanzhao, Wang Tao, Liu State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao China College of Mining and Safety Engineering Shandong University of Science and Technology Qingdao China Ji-er coal mine Yanzhou Coal Mining Company Jining China

This paper aims to solve the problem of roadway rock burst under the complex deep mining conditions. The abutment pressure distribution characteristics of the working face were simulated based on the theoretical study of stope overburden structure. The stress distribution characteristics of the working face surrounding rocks were ascertained by the FLAC3D numerical simulation. According to the results above, the roadway rock burst risk area was predicted based on the occurrence mechanism of rock burst. However, the idea effect can't achieved only by the previous rock burst control measures in high impact risk area. Therefore, an anti-scour yield support technology was studied to adapt to the roadway deformation and avoid support system failure. The industrial test was carried out in the No.113L09 working face crossheading of Ji-er coal mine. The results showed that the anti-scour yield support technology could effectively solve the problem of roadway rock burst under the complex mining conditions and ensure the mine safety and efficient production. © 2015 ejge.

关键词： Rock bursts

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Calculation method and analysis on displacement ductility coefficient of concrete column

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Jianzhu Jiegou Xuebao/Journal of Building Structures 2014年 35卷 151-158页

作者： Zheng, Wenzhong Zhou, Tao Wang, Ying Key Laboratory of Disaster and Control in Structural Engineering Harbin Institute of Technology Harbin150090 China

GB 50010-2010 'Code for design of concrete structures' advocates the use of HRB400 and HRB500 for longitudinal reinforcement and HRB300, HRB400 and HRB500 for stirrup. The newly revised 'Reinforced concrete with hot rolled steel bars' also includes HRB600 reinforcing bars. RC columns configuring high strength hot rolled reinforcing bars will bring changes to seismic performance. Based on the existing research of seismic performance test data about concrete columns with HRB335 for longitudinal reinforcement and HPB235 for stirrup, the influences of axial compression ratio, longitudinal reinforcement ratio, limit eigenvalue of stirrup, shear span ratio and other main parameters on displacement ductility coefficient of RC columns were investigated. The results show that when the longitudinal reinforcement ratio, limit eigenvalue of stirrup and shear span ratio are constant, the displacement ductility coefficients of the columnse decrease with the increase of axial compression ratio;when the axial compression ratio, longitudinal reinforcement ratio and shear span ratio are constant, the displacement ductility coefficients of the columns linearly increase with the increase of the limit eigenvalue of stirrup;when the axial compression ratio, longitudinal reinforcement ratio and limit eigenvalue of stirrup are constant, the displacement ductility coefficients of the columns increase with the increase of the of shear span ratio;when the axial compression ratio, limit eigenvalue of stirrup and shear span ratio are constant, the displacement ductility coefficients of the columns increase with the increase of longitudinal reinforcement ratio. The formula of displacement ductility coefficient of frame column which reflects the influence of key parameters by fitting of test data is proposed. The lower limit bound of seismic displacement ductility coefficient of frame column under different seismic rating is also suggested which can provide a reference for reasonable consideratio

关键词： Reinforced concrete

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Arc-shaped bulkhead applied in short-wall room-and-pillar mining

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Electronic Journal of Geotechnical engineering 2014年第Z6期19卷 17617-17625页

作者： Zhang, Kaizhi Pan, Ruikai Jiang, Jinquan Ji, Songtao Wang, Shuli Guizhou institute of technology Guiyang Guizhou China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province Ministry of Science and Technology Qingdao Shandong China College of Mining and Safety Engineering Shandong University of Science and Technology Qingdao Shandong China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province Ministry of Science and Technology Qingdao Shandong China College of Mining and Safety Engineering Shandong University of Science and Technology Qingdao Shandong China

Study develops with background of short-wall room-and-pillar mining with thick coal seam and thick bedrock in Shendong mining district. In order to prevent the hurricane caused by large-area roof caving in gob instantaneously, an anti-shock bulkhead, which is composed of double layer arc-shaped walls and filling materials between walls, was put forward. The internal force expressions on anti-shock arc-shaped bulkhead which born uniform load were derived by means of elasticity centre method of structure mechanics and field measurement. Meanwhile, the structure of arc-shaped bulkhead was optimized analyzed. The results shows that shock pressure forcing on anti-shock bulkhead are 20~30 atmospheric pressure, the suitable rise of arch is 1.0m and the thickness of arc-shaped bulkhead is only 39.5 percent of that of straight bulkhead based on bending tensile stress. And the material and time of constructing an arc-shaped bulkhead is 60 percent less than the straight bulkhead's in the case of suffering same shock pressure, which realize the rapid sealing and good safety.

关键词： Atmospheric pressure

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Mechanical properties of cementation bodies formed by casting cemented gangues

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Electronic Journal of Geotechnical engineering 2014年第M期19 M卷 2937-2945页

作者： Zhan, Xiaoyuan Wang, Fang Zhan, Lanqin Wang, Qingheng Shi, Yongkui Hao, Jian State Key Laboratory Breeding Base for Mining Disaster Prevention and Control Shandong University of Science and Technology Qingdao 266590 China College of Materials Science and Engineering Shandong University of Science and Technology Qingdao Shandong 266590 China

It is an important measure for sustainable development of coal mines to use backfill mining which focuses on adopting gob-side entry retaining support technology. The scope of technological applications, however, is often severely restricted by its high filling cost. Some factors affecting the compressive strengths of cementation bodies formed by cementing materials which directly composed of casting gangues excavated in coal mine after grinding, such as the ratio, viscosity and fluidity of cementing materials and the gradation and particle size of gangues were investigated. When the content of coal fly ash appropriately increased, the compressive strengths and casting performance of cementation bodies improved, also the filling cost reduced. Simultaneously, the viscosity of casting cementing materials increased as time prolonged, and the compact cementation body formed within 15min. Cementation body with the highest 28-day compressive strength reached 6.05MPa was proposed, it included 30% D16-20mm and 70% D20-25mm gangues using continuous gradation. Although the 28-day compressive strengths of casting cementing bodies were about 25% lower than that prepared by mechanical mixing, the filling cost was greatly reduced result from decreasing mixing station and pumping equipment. © 2014 ejge.

关键词： Filling

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Optimization of groundwater 1D multi-tank model based on physical experiments

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Electronic Journal of Geotechnical engineering 2014年第Y期19卷 8827-8841页

作者： Nie, Wen Huang, Runqiu Chen, Yulong Zhang, Qiangui Wang, Jun State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection Chengdu University of Technology Chengdu China Department of Civil Engineering University of Tokyo Tokyo Japan State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu Sichuan China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing China

Pore water pressure (PWP) produced by the water table is the most obvious factor affecting the stability of slopes against rainfall events for deep seated landslide. By contrast, the moisture content (MC) of surface soil usually controls the slope failure for shallow landslide. We improved on current methods of groundwater level and surface moisture estimation by original tank model considering this model complicated by time lags associated with infiltration and drain laws in landslides. In this study, we calibrate the original tank model to improve the estimation of ground water table and surface moisture under different rainfall intensities and durations. The distinct characters considering or not surface runoff are discussed by experimental results. The results show that during the infiltration stage the PWP and MC will keep the same until the threshold at which the PWP and MC begin to increase obeying log function. Furthermore, there is a time lag between the peak and infiltration depending on the initial water statues. By contrast, in the drainage process without rainfall the traditional linear relationship between drainage rate and PWP (or MC) should be replaced using the power (log) function. © 2014 ejge.

关键词： Infiltration

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Consistent lattice Boltzmann methods for incompressible axisymmetric flows

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Physical Review E 2016年第2期94卷 023302-023302页

作者： Liangqi Zhang Shiliang Yang Zhong Zeng Linmao Yin Ya Zhao Jia Wei Chew School of Chemical and Biomedical Engineering Nanyang Technological University Singapore 637459 Singapore Department of Engineering Mechanics College of Aerospace Engineering Chongqing University Chongqing 400044 People's Republic of China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing 400044 People's Republic of China Singapore Membrane Technology Center Nanyang Environment and Water Research Institute Nanyang Technological University Singapore 637141 Singapore

In this work, consistent lattice Boltzmann (LB) methods for incompressible axisymmetric flows are developed based on two efficient axisymmetric LB models available in the literature. In accord with their respective original models, the proposed axisymmetric models evolve within the framework of the standard LB method and the source terms contain no gradient calculations. Moreover, the incompressibility conditions are realized with the Hermite expansion, thus the compressibility errors arising in the existing models are expected to be reduced by the proposed incompressible models. In addition, an extra relaxation parameter is added to the Bhatnagar-Gross-Krook collision operator to suppress the effect of the ghost variable and thus the numerical stability of the present models is significantly improved. Theoretical analyses, based on the Chapman-Enskog expansion and the equivalent moment system, are performed to derive the macroscopic equations from the LB models and the resulting truncation terms (i.e., the compressibility errors) are investigated. In addition, numerical validations are carried out based on four well-acknowledged benchmark tests and the accuracy and applicability of the proposed incompressible axisymmetric LB models are verified.

关键词： Lattice gases Lattice-Boltzmann methods Navier-Stokes equation

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Partition of gas-rich region in overlying stratum based on key stratum

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Electronic Journal of Geotechnical engineering 2014年第Z6期19卷 17591-17602页

作者： Cheng, Wei-Min Sun, Lu-Lu Wang, Gang Qu, Hong-Yuan State Key Laboratory Breeding Base for Mining Disaster Prevention and Control Shandong University of Science and Technology China College of Resources and Environmental Engineering Shandong University of Science and Technology Qingdao China Colorado School of Mines CO United States

In order to improve the pertinence and drainage effect of gas control on the working face, the partition of the gas-rich region in overlying stratum is proposed according to the research of the theory of elastic thin plate and the theory of pressure relief index of overburden stratum and key stratum of the working face. The corresponding level value of pressure relief r when the inflation rate reached 3% is regarded as the criterion condition of critical key stratum of pressure relief. Overlying stratum are divided into low concentration and easy for gas drainage area, high concentration and easy for drainage area, and primary stress zone by the key stratum. The UDEC software is used for the numerical simulation of the 7433 working face in Kongzhuang coal mine. The numerical simulation result is consistent with the theoretical analysis. Field application is proceeded in the 7433 working face according to the results of theoretical analysis and numerical simulation. The gas consistence in upper corner and return air current are separately reduced by 66.7%, 53.5% under the condition of drainage. The result shows that the partition of the gas-rich region in the goaf of the working face is reasonable and effective. This research has provided a new basis and means for gas control with popularization and application prospects.

关键词： Gases

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Supporting technique of gob-side entry driving in asymmetric Island coal face in deep and its application

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Electronic Journal of Geotechnical engineering 2014年第Z3期19卷 10539-10550页

作者： Jia, Chuanyang Luan, Hengjie Chen, Zeyu State Key Laboratory of Mining Disaster Prevention Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao China College of Mining and Safety Engineering Shandong University of Science and Technology Qingdao China

In view of large buried depth of the coal seam, serious dynamic pressure manifestation of the strip mining, especially stress concentration of local anomalies exacerbated due to the asymmetric isolated structure, the maximum compression of coal in internal stress field was calculated through the theory of gravity equilibrium equation in this paper. And results show that coal compression increases as gob area increases. Then a new "top-slope conjoined supporting" technology in the crossheading along the empty was put forward based on results above. In this paper, analysis of the numerical and in-site measured data illustrates that the good control of combination of the new technology and local strengthening support in the asymmetric regions can effectively control deformation degree and scope of the surrounding rock in the roadway. In this way, the support problems of the asymmetric island coal face can be solved effectively. © 2014 ejge.

关键词： Coal

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control technology and deformation law of gob-side entry driving roadway with dynamic pressure and high stress in deep mine

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Electronic Journal of Geotechnical engineering 2014年第Z6期19卷 17667-17678页

作者： Jia, Chuanyang Chen, Zeyu State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao China College of Mining and Safety Engineering Shandong University of Science and Technology Qingdao China

In view of the dynamic pressure effect in the whole process of the adjacent working face mining to the fully-mechanized caving mining gob-side entry driving roadway in deep mine and the problems of severe roadway deformation and difficulty of supporting, in combination with the numerical simulation, this paper analyzed the deformation law of gob-side entry driving roadway with dynamic pressure from the adjacent working face, revealed the existing of asymmetry in the roadway deformation, and summarized that the weak structures of the roadway was the narrow coal pillar. Based on the research above, this paper proposed the non-harmonious control technology for the gob-side entry driving, namely, a united supporting scheme includes high strength pre-stressed yield bolt, the pre-stressed anchor cable, the W-type steel band and the metal net, which is applied to the gob-side entry driving roadway with dynamic pressure in a deep coal mine. The field test showed this scheme could adapt to asymmetric characteristic of the roadway, realize the effective control of roadway deformation.

关键词： Deformation

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Deformation characteristics and failure mode of sandstone

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Electronic Journal of Geotechnical engineering 2014年第U期19卷 6021-6034页

作者： Shi, Yong-kui Hao, Wu Jian, Hao State Key Laboratory of Mining Disaster Prevention Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao China College of Mining and safety Engineering Shandong University of Science and Technology Qingdao China

Taking sandstone of the roadway roof 5210, panel 402 of Jinhuagong Coal Mine as the research object, the sandstone's deformation was analyzed under the condition of unidirectional tension and compression based on the Brazilian splitting test and uniaxial compression test of the sample, and the failure mode of the samples were studied from the viewpoint of energy evolution, in order to obtain failure characteristics and deformation rule of sandstone under tension and compression load and to provide a scientific basis for the roadway supporting design. The research results show: 1 The reason of the rock sample fractured in the Brazilian splitting is directly related to the rock's internal structure and components. 2 The sandstone presents strong brittle failure when it bears tension, and when the tension reaches to the maximum failure load, the sample has no residual strength. 3 Under the condition of the uniaxial compression, the rock sample's failure modes mainly include splitting failure, splitting and shear joint failure and single shear failure. Specifically, they are the single crack fracturing, splitting crack and shear failure mode, etc. 4The test sample has direct relationship with dissipated energy ratio of the sample fracture before and after. The lower ratio, the smaller fractured block of the sample;while the higher ratio, the bigger the block. © 2014 ejge.

关键词： Failure modes

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