Method for forecasting range of surface movement induced by underground mining of open-pit iron mine end slope

Abstract

The invention discloses a method for forecasting a range of surface movement induced by underground mining of an open-pit iron mine end slope. The method comprises the following steps: constructing an equivalent jointing rock mass model for an ore body mining region of an open-pit mine end slope, and simulating rock stratum and surface movement induced by ore body mining under the open-pit mine end slope and a destroy discipline; performing parameter back analysis on the equivalent jointing rock mass model; simulating and inverting mechanical parameters of the jointing surface according to an orthogonal experiment and values to obtain an optimal mechanical parameter of the jointing surface; forecasting the range of the surface movement induced by the ore body mining from the open-pit mine end slope: simulating open-pit mine end slope ore body mining through the equivalent jointing rock mass model, calculating displacements of all points on the surface in the X direction, the Y direction and the Z direction, and drawing a displacement contour map, and selecting a boundary of the range of the surface movement to forecast the range of the surface movement. The method is used for analyzing the surface movement induced by the underground mining of the open-pit mine end slope, so that the deformation and destroy states of the surface in different mining stages can be determined; a basis is supplied to safe production, and casualties and property loss which are caused by the surface movement and collapse are avoided.

Description

technical field [0001] The invention belongs to the technical field of mining engineering, and in particular relates to a method for predicting the range of surface movement induced by underground mining of side walls of open-pit iron mines. Background technique [0002] my country is a country that uses open-pit mining for iron ore, and more than 90% of the self-produced iron ore comes from open-pit mining. After decades of mining, most open-pit mines have entered the middle and late stages. Since most of the large-scale iron ore deposits in my country are inclined or steeply inclined ore bodies, the burial depth is relatively large, and if the open-pit mining depth exceeds 300m-400m, if the open-pit mining is continued, it will be unreasonable economically, occupying more land, and causing more damage. Great ecological damage. Therefore, most open-pit iron ore mines will switch to underground mining after the end of open-pit mining. The end-side ore body of an open-pit m...

AI Technical Summary

Problems solved by technology

[0009] (3) Simulating a large number of joints in the calculation model will lead to too many blocks in the model, making the calculation impossible; while the joint rock mass is equivalent to a continuum and cannot simulate the caving and breaking of surrounding rocks. Failure phenomena and discontinuous and large displacement movements of rock mass

[0010] (4) At present, there is no technical means based on the basic theory of discrete elements that can not only solve the problem of computational efficiency, but also simulate the problem of discontinuity and large displacement

Images