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Mining Science and Technology 2010年第5期20卷 718-722页

作者： LU Yan LIU Changyou School of Mines China University of Mining & Technology Xuzhou 221116 China State Key Laboratory of Coal Resources and Mine Safety Xuzhou 221008 China

In order to study the mechanism of bolt support and the behavior of strata in a coal roadway under tectonic stress,deformation and destruction of a roof,floor and sides were studied using an experiment in similarity *** also studied the mechanism and types of bolt support functions in the coal *** results show that with an increase in horizontal tectonic stress,the strata in the roof and floor of the roadway gradually separate and become shear failure *** in side walls moves,but its integrity remains *** bolts are mainly affected by tension and roof bolts by the effect of shear.

关键词： tectonic stress coal roadway bolt support similarity simulation

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Effect of slope angle on fractured rock masses under combined influence of variable rainfall infiltration and excavation unloading

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第10期16卷 4154-4176页

作者： Xiaoshuang Li Qihang Li Yunmin Wang Wei Liu Di Hou Chun Zhu School of Urban Construction Changzhou UniversityChangzhou213164China College of Civil Engineering Qilu Institute of TechnologyJinan250200China School of Resources and Safety Engineering Chongqing UniversityChongqing400044China Sinosteel Maanshan General Institute of Mining Research Co.Ltd. Maanshan243000China Guizhou Survey and Design Research Institute for Water Resources and Hydropower Guiyang550001China School of Earth Sciences and Engineering Hohai UniversityNanjing210098China

Intense precipitation infiltration and intricate excavation processes are crucial factors that impact the stability and security of towering and steep rock slopes within mining *** primary aim of this research was to investigate the progression of cumulative failure within a cracked rock formation,considering the combined effects of precipitation and excavation *** study was conducted in the Huangniuqian eastern mining area of the Dexing Copper Mine in Jiangxi Province,*** engineering geological investigation was conducted,a physical model experiment was performed,numerical calculations and theoretical analysis were conducted using the matrix discrete element method(Mat-DEM),and the deformation characteristics and the effect of the slope angle of a fractured rock mass under different scenarios were *** failure and instability mechanisms of the fractured rock mass under three slope angle models were *** experimental results indicate that as the slope angle increases,the combined effect of rainfall infiltration and excavation unloading is reduced.A novel approach to simulating unsaturated seepage in a rock mass,based on the van Genuchten model(VGM),has been *** to the vertical displacement observed in a similar physical experiment,the average relative errors associated with the slope angles of 45,50,and 55were 2.094%,1.916%,and 2.328%,***,the combined effect of rainfall and excavation was determined using the proposed ***,the accuracy of the numerical simulation was *** findings contribute to the seepage field in a meaningful way,offering insight that can inform and enhance existing methods and theories for research on the underlying mechanism of ultra-high and steep rock slope instability,which can inform the development of more effective risk management strategies.

关键词： Open-pit to underground excavation Rainfall infiltration similarity simulation Numerical simulation Image recognition Slope angle

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Mechanism and technology study of collaborative support with long and short bolts in large-deformation roadways

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International Journal of Mining Science and Technology 2015年第4期25卷 587-593页

作者： Yu Hui Niu Zhiyong Kong Linggen Hao Caicheng Cao Peng School of Resources and Safety Engineering China University of Mining and Technology

Common short bolts of equal length are widely used to support the roofs of roadways in coal ***, they are insufficient to keep the roof stable against large deformations, so docking long bolts with high levels of elongation that can adapt to large deformations of the surrounding rock have been adopted. This paper proposes a collaborative support method that uses long and short bolts. In this study,the mechanism of docking long bolts and collaborative support was studied. Numerical simulation, similarity simulation, and field testing were used to analyze the distribution law of the displacement, stress,and plastic failure in the surrounding rock under different support schemes. Compared with the equal-length short bolt support, the collaborative support changed the maximum principal stress of the shallow roof from tensile stress to compressive stress, and the minimum principal stress of the roof significantly increased. The stress concentration degree of the anchorage zone clearly increased. The deformation of the roof and the two sides was greatly reduced, and the subsidence shape of the shallow roof changed from serrated to a smooth curve. The roof integrity was enhanced, and the roof moved down as a whole. Plastic failure significantly decreased, and the plastic zone of the roof was within the anchorage range. The similarity simulation results showed that, under the maximum mining stress,the roof collapsed with the equal-length short bolt support but remained stable with the collaborative support. The collaborative support method was successfully applied in the field and clearly improved the stability of the surrounding rock for a large deformation roadway.

关键词： Collaborative support with long and shortbolt Docking long bolt Numerical analysis similarity simulation

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Deformation characteristics of surrounding rock of broken and soft rock roadway

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Mining Science and Technology 2009年第2期19卷 205-209页

作者： WANG Jin-xi LIN Ming-yue TIAN Duan-xin ZHAO Cun-liang Key Laboratory of Resource Survey and Research of Hebei Province Hebei Universil3 of Engineering Handan Hebei 056038 China The Bureau of Land and Resources of Wu＇an City Wu ＇an Hebei 056300 China

A similar material model and a numerical simulation were constructed and are described herein. The deformation and failure of surrounding rock of broken and soft roadway are studied by using these models. The deformation of the roof and floor, the relative deformation of the two sides and the deformation of the deep surrounding rock are predicted using the model. Measurements in a working mine are compared to the results of the models. The results show that the surrounding rock shows clear theological features under high stress conditions. Deformation is unequally distributed across the whole section. The surrounding rock exhibited three deformation stages： displacement caused by stress concentration, theological displacement after the digging effects had stabilized and displacement caused by supporting pressure of the roadway. Floor heave was serious, accounting for 65% of the total deformation of the roof and floor. Floor heave is the main reason for failure of the surrounding rock. The reasons for deformation of the surrounding rock are discussed based on the similar material and numerical simulations.

关键词： soft rock roadway broken surrounding rock similarity simulation numerical simulation deformation characteristics

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Study on the characteristics of ground pressure behaviors in working face with great mining height at different advance speeds by similarity model experiment

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Journal of Coal Science & Engineering(China) 2007年第1期13卷 28-31页

作者：华心祝张金龙谢广祥 Dept. of Resource Exploitation and Management Anhui University of Science and Technology Huainan 232001 China College of Civil Engineering Hohai University Nanjing 210098 China

Presently most of research results on strata behaviors were concluded under the normal （moderate） advance rate conditions. Comparing with normal advance rate, fast advance rate and slow advance rate may cause some new changes of strata behaviors. The characteristics of ground pressure behaviors in working face with great mining height at different forward speeds were studied by similarity model experiment in laboratory. Its conclusion provides a theoretic basis for ground pressure controlling.

关键词： similarity simulation advance rate working face with great mining height ground pressure

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