A Study Of Filling Materials And Pipeline Transportation Systems In Deep Mines

Main theoretical and technical problems related to filling materials and pipeline transportation systems are discussed in detail in this paper, in terms of theory of both rock mechanics and engineering hydromechanics, on the basis of comprehensive analyzes of characteristics of deep filling, combined with researching experiences in Kangjiawan Lead-Zinc-Gold Mine, Hunan province, Xinqiao Pyrite Mine, Anhui province, Kaiyang Phosphate Mine, Guizhou Province, and other mines. Researching results not only can be referred by other related deep mines but also can make a great contribution to construction of systematic deep filling theory and technology of China. Major works and main conclusions of this paper are summarized as follows:(1) Energy release rate of surrounding rocks and average stress of pillars can be effectively reduced by filling body in deep mines. Collapse risk of surrounding rocks can be forecast by energy calculated according to risk forecasting model in the view of energy control. The forecasting method supplies an effective means to evaluate safety of deep mining and establishes an important theoretical base of design and choice of deep stope structure, filling materials and filling systems.(2) Physical and mechanical parameters of different filling materials are measured, optimal contents of various parts within mixed filling materials are tested as well as usage effect of addition agents in several mines. Formation function of slope formed when slurry flows in a stope is developed, by which damage types of filling body can be determined. Safety filling height and stope structure can be quantitatively designed and filling quality can be comprehensively evaluated and controlled, based on quality evaluation formula of cemented filling body developed according to trestle beam theory. Numerical simulation of relationship between roof-touched filling proportion and filling effect indicates that cemented artificial pillar poses a good load-bearing capacity so long as roof-touched filling proportion reaches to 50%. The conclusion identical to filling...