A dynamic design method for strength of cemented filling body in underground stope

Abstract

The invention discloses a dynamic design method for strength of a cemented filling body of an underground mining stope, belonging to the mining field of a filling method. The design method comprises the steps: (1) calculating a top stress value and lateral stress values of the filling body of the mining stope by means of a hydrostatic pressure theory according to the buried depth of the mining stope; (2) simplifying a mechanical model for the interaction of the filling body and surrounding rock into a three-dimensional stress problem with the same lateral pressure, wherein the destruction of the filling body of the mining stope complies with a Hoek-Brown experience strength destruction criterion; (3) determining the integrity index of the cemented filling body according to the quality requirements of the to-be-filled mining stope under different conditions to the cemented filling body; (4) contrasting the strength value of the cemented filling body satisfying the requirement of the specified filling quality and the strength value capable of satisfying the independence requirement of the filling body of the mining stope, and taking a maximum between the values. The features are as follows: not only the top stressing condition and the onsite filling quality of the actual mining stope are considered, but also the dimension variation of the mining stope is adapted and the strength value of the cemented filling body is dynamically designed.

Description

technical field [0001] The invention relates to the field of filling method mining, in particular to the strength design of the filling body for the filling method mining of large underground ore deposits. Background technique [0002] Mining operation is a dynamic evolution process, the stress environment of the filling body is complex and changeable, and it is a nonlinear complex multiphase medium body. The relationship between filling body and surrounding rock is not only related to factors such as stope mining strength and mining depth, but also related to filling body proportion and filling quality. Therefore, the selection of filling body strength is a process of dynamic matching design. The proportion and strength of filling body is one of the key factors to save filling cost and ensure safe operation of stope, especially some filling mining methods that require high early strength of filling body; in terms of determining the strength of filling body in stope, foreign...

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Problems solved by technology

The proportion and strength of filling body is one of the key factors to save filling cost and ensure safe operation of stope, especially some filling mining methods that require high early strength of filling body; in terms of determining the strength of filling body in stope, foreign filling The strength value is about 1-2MPa, and the domestic non-ferrous metallurgical mine operation specification clearly stipulates that the filling body strength of the downward filling method must be above 5.0MPa; for the selection of the filling body strength value of various other filling mining methods Design institutes and related scientific research units usually recommend filling body strength of 4-5MPa based on experience (Jinchuan nickel ore selection 4.5MPa), so the strength of domestic filling bodies is usually higher than the strength value selected abroad, which directly leads to high filling costs in domestic mines , there is no accurate and suitable design method to determine the strength of stope filling body

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