A metal ore overlying rock three-dimensional space stress calculation method under artificial pillar support

Abstract

A metal ore overlying rock three-dimensional space stress calculation method under artificial pillar support comprises the steps: establishing a goaf overburden rock space stress model and a space goaf stress model, and establishing a space coordinate system; Calculating and solving each stress component of the overlying strata when the overlying strata only has the gravity and the supporting force effect of the beam: when only the structural stress effect exists, the internal equation of the system is the same as the supporting force effect of the beam, and the boundary condition is changed,then solving each stress component of the overlying strata; When an artificial pillar is adopted for supporting, all stress components of the overlying strata are calculated and solved; And when the rock mass bears the combined action of the supporting force and the structural stress, each stress component is calculated, and finally the potential energy of the whole rock mass is obtained. According to the method, the stress distribution and concentration degree of the overlying strata in the goaf can be changed through manual mining column support, and the stress of the metal ore overlying strata in the three-dimensional space under the manual mining column support can be obtained through calculation.

Description

technical field [0001] The invention belongs to the technical field of mining safety prevention and control in metal mines, and in particular relates to a calculation method for three-dimensional space stress of metal mine overlying rock under the support of artificial ore pillars in goafs of metal mines. Background technique [0002] Coal is generally formed in sedimentary rocks, and metal minerals are generally produced in magmatic rocks. Therefore, the ore bodies of coal mines are mostly layered, while the ore bodies of metal mines are mostly veined and massive. When studying the failure of coal mine strata, it is generally regarded as "beam" or "thin plate", and a lot of beneficial results have been obtained, but most of the studies on the movement of overburden rock in metal mines are directly based on the results of coal mines, which leads to the research results There is a large deviation from the actual engineering. At the same time, due to the complex burial condit...

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Problems solved by technology

When studying the failure of coal mine strata, it is generally regarded as "beam" or "thin plate", and a lot of beneficial results have been obtained, but most of the studies on the movement of overburden rock in metal mines are directly based on the results of coal mines, which leads to the research results There is a large deviation from the actual engineering

At the same time, due to the complex burial conditions of metal mines, gravity and tectonic stress have become important factors affecting the stability of goaf surrounding rock and the movement of overlying rock in the dynamic process of mining. Structural stress is rarely considered as an important factor in the construction of mechanical models

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