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A Method for Determining the Ditch Angle of Bottom Structure

A bottom structure and determination method technology, applied in earth square drilling, surface mining, underground mining, etc., can solve the problems of ore residue, ore permanent loss, bursting ore hanging arch, etc., to ensure stability, increase fluidity, The effect of reducing the secondary loss rate

Active Publication Date: 2019-11-12
NORTHWEST RES INST OF MINING & METALLURGY INST
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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems existing in the prior art, such as serious ore residue phenomenon, overhanging ore hanging arch and permanent loss of ore caused by unreasonable selection of trench angle, and to provide a bottom structure trench angle. determination method

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  • A Method for Determining the Ditch Angle of Bottom Structure
  • A Method for Determining the Ditch Angle of Bottom Structure
  • A Method for Determining the Ditch Angle of Bottom Structure

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with specific examples.

[0046] A method for determining a trench angle of a bottom structure, the method comprising the following steps:

[0047]A. Determine the influence of rock firmness and stability on the angle of the trench: the firmness of ore rock is a performance of resisting external forces. Since the firmness of the rock is different from the strength of the rock, the strength value must be related to a certain deformation mode ( uniaxial compression, tension, shear), and the firmness reflects the ability of the rock to resist damage under the combination of several deformation modes. Due to the force of explosive explosion, mechanical crushing and friction of ore on the two slopes of the trench during the formation process and normal use of the trench, the firmness of the bottom structure ore rock will be destroyed, so the firmness of the ore rock has a great impact on the trench. The de...

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Abstract

The invention discloses a determination method for the trench angle of a bottom structure, specifically to a method for determining a trench angle for a steeply dipping medium-thick or thick ore body (>= 55 DEG, > 4 m, and f=3 to 20) employing a bottom structure for ore removal. The method separately quantifies influence on the trench angle by uncertain factors consisting of firmness and stability of ore rocks, the caking properties, water content and lumpiness of ore, thickness of the ore body, technical parameters of rock drilling equipment and the like by using an orthogonal testing method, an engineering analogy method, an induction method, a numerical simulation method and the like, so relationships between the trench angle and the factors are clearly determined; and thus, an optimal trench angle can be eventually determined. The determination method provided by the invention can improve mobility of caved ore and ensure stability of continuous ore removal, thoroughly overcomes the technical problems of insecurity of suspended arching of ore, secondary loss rate of caved ore and the like and is of important practical significance to safety of a stope room and economic stoping.

Description

technical field [0001] The invention belongs to the technical field of underground mines, and in particular relates to a method for determining the angle of a bottom structure trench. Background technique [0002] According to different ore body occurrence characteristics and mining technical and economic conditions, in order to recover ore safely and efficiently, different mining methods and ore handling methods must be adopted. The bottom structure is one of the main elements of the mining method, which largely affects the ore extraction efficiency, ore loss rate, and the safety of ore handling. The trench has the characteristics of safe on-site operation, convenient construction, good bottom stability, high mining efficiency, and is suitable for large-scale trackless equipment transportation. It has been used by many non-ferrous metal mines. [0003] The formation of the bottom structural trench is the most critical process link when underground mines adopt the open-fiel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/22
CPCE21C41/22
Inventor 王成财刘武团孙嘉郭生茂高庆伟郝显福王忠泉陈小平
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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