| With the improvement of standard in environment protection, safety production and resource recycle, the filling technology has taken good effect on energy-saving& ejection-decreasing and safety&environment protection. Filling technology will have broad application on the scope of goaf treatment, solid waste reuse, deeper mining and difficult-to-mine orebody mining. However, the currently filling technologies have itself shortcomings and it couldn't meet the production requirements of underground mine. So, it is necessary to commence on deeper research regarding the physical properties of filling body and the interaction between filling body and surrounding rock. To developing the newest filling materials and overcome the obstruction on the development progress of filling technology, and it can be provided the technology support to the high-efficient mining in deep mine.This thesis taking advantage of the research project of the country "11th Five-Year Plan", which name is "Detection on Stowing Goaf and Research on Key Technology and Equipment in controlling water disasters", and the state invention patent of "Aluminum matrix coagulation material". The research, by means of laboratory experiments, spot working and theoretical analysis, etc, on filling body study based on mechanical characteristics of filling body and its function mechanism with rock mass, as well as the combination of aluminum matrix coagulation material, was crowned with success. The theory achievement has been used in mining technique. There is enormous room for its application.The mainly research contents in this paper as follow:(1)In order to know the physical properties of filling body, the tests of large-scale underground filling body with multi-mean, multi-direction and multi-character mechanical property were carried out for the first time. The results of mechanical experiments were vertified and the precise mechanical property parameters and performance were obtained too. From these results, it can be recognized that it is very important to maintain the three-dimensional force state of the cementing filling body, and the cementing filling body is plays the role of elastic support before reache at the yield point, it also shows the effect of yield timbering after reaching yield point.(2)The interaction mechanism of filling body and surrounding rock was revealed in this paper. The action process and mechanism of pressure yield, stress isolation and support of underground filling body were researched and analyzed. The change of filling body's stress during different mining and filling steps was simulated. It can be concluded that the designed strength of the filling body and the elastic modulus of the surrounding rock are influenced by in-situ stress. The simulated experiment shows that, as for two-step mining, there is a downtrend of the area of plastic deformation zone after stope is filled. And the tendency is more obvious with the rise of the filling body's strength. Filling the stope after the first step can effectively improve the stress state, providing favorable conditions for the second step mining.(3) The concept of standard proportion of aluminum matrix coagulation material was first proposed. It is the first time to conduct comprehensive and systematical test and analysis from characteristics, reaction mechanism, condensation and hardening feature, physical and influence factors of rapid hardening materials. Aluminum matrix coagulation material which has stable performance and can be transported by single-tube and its standard proportion were developed. The standard proportion of new aluminum matrix coagulation material was determined based on the standard raw materials with stable physical and chemical properties, it is mixing ratio of sulpho-aluminate cement clinker as aluminum matrix active material, gypsum, alkaline exciting agent and additive agent. When other materials with potential hydration reaction activity (such as blast furnace slag, fly ash, and so on), chemical gypsum (such as phosphogypsum, fluorgypsum, and so on) are used to replace the all or part of standard raw materials, the proportion of raw materials can determined by conversing according to the mineral compositions of raw materials and based on the standard proportion, then be optimized and confirmed by indoor experiments. During the research, slag or fly ash is substituted for sulpho-aluminate cement clinker of 30%～50%successfully, and rapid hardening materials with various proportions, which can be transported single-tube and in which natural gypsum is replaced by phosphogypsum were developed, their performances all reach and surpass that of the coagulation material with the standard proportion. These provide solid foundation for the promotion and application of rapid hardening materials.(4)The research makes a breakthrough in application and production of rapid hardening material, and makes raw material's localization and single-tube transportation come realize. Aluminum matrix coagulation material has many advantages, such as high ability of water consolidation, preferable suspension property and fluidity of slurry, no need of dewatering, high velocity of solidification, great increase of strength, rational cost of filling, much more sources of raw materials, and so on. The moist content of the aluminum matrix coagulation material can reach as high as 70%or more, and its strength can reach to 0.5～1.0MPa after solidifying for one hour. It is favorable to achieve a great deal of continuous filling operation, and shows outstanding advantages in the case of requiring fast solidification and large-area goaf filling.(5) According to the above-mentioned theories and the results of experiment test, take the local-produced slag as raw material to produce the new quick setting material. The optimization of filling parameters were obtained in a mine where is located at downward the leak area. Filling industrial test and application was conducted by using the newest cementing material and taken the classified tailings and unclassified tailings as the aggregate. The results of test have met the anticipated requirements of technical and economic, and a new mining-filling model was formed. The goal of mining technology advancement drive by filling technology improvement was achieved. |
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