Research And Application Of Strength Model Of Filling Retaining Wall

In recent years, filling mining with its unique superiority, in the mineral resources gradually turn to complex conditions of the "under three" difficult mining ore body, get more extensive development and application in a high stress environment of deep ore body mining process. Among them, filling retaining wall is used as a filling material filling plugging structures. The filling material behavior is complex and prolonged standing with their mechanical characteristics are changing, empty area is various and multi-channel, so the multi-layout of retaining is much, high cost and has serious security risk, make the filling process turning into Engineering technical problem.Currently, the design strength for filling retaining wall, do a lot of theoretical and experimental studies for the strength of mining and filling processes at home and abroad, form the engineering analogy and experience method, because there is no full account of working conditions and the nature of the cemented filling material, the design value is often high, resulting in redundancy retaining wall structure, high cost; And the lack of filling retaining wall structure design and stability calculation. Actually water filling material with complex physical and mechanical properties, as well as differences in the filling process of retaining special features and safety requirements, make the rational design of retaining the strength and structure becoming more difficult.①Aimed at the filling retaining wall which is respectively route type, layer-stepping and phase subsequent type under non-cemented filling technique, the strength calculation model is established.②Aimed at the filling retaining wall which is respectively route type, layer-stepping and phase subsequent type under cemented filling, the filling strength calculation model is established.③Aimed at the filling retaining wall which is layer-stepping and phase subsequent type under dry gravel filling, the filling strength calculation model is established. For the above model, the mine choose them according to the actual nature of mine filler and packing condition, which can realize the reasonable calculation and optimization for the strength of retaining wall.According to the strength design problems:through basic mechanical properties of a large number of documents and filling, found the stope filling aggregate water content, internal friction angle, and the retaining wall and surrounding rock by friction between the initial height of filling, filling cycle, and installation position and other factors, is the key to the design and optimization of the strength and structure of retaining wall. On this basis, the filling in process and timing system is divided into three kinds of ideal state of liquid, viscous inviscid ideal dispersion and dispersion, in different states, filling aggregate by retaining wall binding effect, considering different boundary factors, according to the statics, limit or sliding cutting equilibrium conditions, classification established wall strength the calculation model. Combined with the height of the wall, divided into different filling conditions; combined with filling cycles, divided into when time and multi-layer filling. The active pressure, retaining wall by the filler effect of total pressure and the action point of the initiative, detailed calculation. Analysis of retaining wall is the real force condition and validate the model algorithm, taking a typical copper mine adopts afterwards filling mining method based on engineering test. Through the production of stope model, for the three time semi industrial test of the model, the strength is verified. Sum up experience, and435of a mined out area at the bottom of the middle wall, tested, and the calculated value and the theoretical strength model, the contrast analysis is carried out. Finding:①select the parameter and model formula of reasonable design, on the strength of filling retaining wall is the key;②the calculation model is greater than observed value40～60%the current strength of the mine, this paper theoretical strength model equation5.44the calculated10～20%, more consistent with the calculation of strength of the copper water retaining wall sand back filling;③the height reached35m in the filling later, the measured value tends to be stable, while the model equation5.44in the considered bottom filling Factor of filling height is30m, the intensity value tends to be stable, are closer to each other;④This paper model formula5.44conform to the stope retaining wall measured law, and the adjacent goaf bottom retaining wall strength and structure design, contrasting using steel anchor flexible retaining wall filter water, safe and convenient, not only can improve the filling water filtering, but also can improve the filling efficiency, saving the cost of retaining wall construction. Can be used as the optimization scheme of the test and popularization of the copper mine.In addition, this article is more comprehensive and systematic establishment of filling retaining wall strength calculation and structural design model, For extensive use of filling mining mines, laid the theoretical filling retaining wall design support, and to provide a certain amount of optimization measures and technical guidance in engineering applications.