A Study On Wear Mechanism And The Reliability Evaluation System For Backfilling Pipelines In Deep Mine

With China's growing consumption of shallow resources, mineral resources tend to develop deep. In this trend, the rate of cemented fill method in deep mining was significantly increased.However, the cement fill method for deep mining is different from the shallow mining, the technical problem of filling system, which is needed to focus on resolving is:the solid-liquid two-phase flow characteristics of pipeline transportation, pipelines and filling system reliability wear mechanism. As domestic and international mining experience, deep fill mining method most to used gravity conveyor technology, and in the filling system encountered major technical problem is wear and tear on pipes to affect on production and safety,especially within the pipe in vertical drills. At present, the study of pipeline's wear is more in oil and natural gas, but its damage in the form is essential different, the damage of former is mainly corrosion damage, while the latter is a highly complex major impact wear damage.Domestic and foreign scholars studied on this kind of wear problem had only in the experience exploratory stage, and serious lack of theoretical basis.Therefore, the research on wear mechanism of deep mining pipeline should be the major problems needed to solve in deep filling system construction and design.This paper analyzes the applicability of filling deep for the most commonly used filling material and the ratio of these material. It could confirm the type of filling material to select in deep mining. And from researching on pipe's transport performance, it could made several filling systems. At the same time, it confimed the best choice for deep mining is gravity delivery system by study of transport properties of two-phase. At last it confimed the main research on pipeline filling in deep mine was the wear mechanism of the vertical pipe.With the characteristics of gravity flow transportation and combine the actual filling process conditions in Jinchuan mine it can be known the basic form and position of the vertical pipes by the field research. And using the principles of momentum and energy to explain the mechanism of wear of the pipeline. At the same time, it was quantitative analysisd the Impact degree with diameter, grain size composition, volume density and filling factor times.Based on the mechanism of wear and tear in pipes, made a deep set summarized and specific measures to reduce pipe wear and tear for the future of China's large-scale deep mining technology and provided a reliable direction.of research.Using fault tree analysis principles and the principles of probability of failure to study the reliability of deep mine filled pipeline system and conducted a comprehensive evaluation system. Study found that sudden failure of pipeline wear and damage, leading to filling the pulp quality was one of the major factor in system failure, and the system's times the filling line, unreasonable negative slope segment and operations management oversight, were also the important reason to lead to the system failling.In general, the higher the level of accident factors, the higher the system reliability. The system could calculate the acceptable failure probability after the transformation by obtained the weight of each grade of membership function matrix corresponding value. And through calculated the probability of accident by the mine accidents statistical parameters which was accumuled of long-term production.At last it could determine the reliability of deep filling piping system By comparing.This article summarized the major technical problems in deep filling, and proposed the technical approach to solve these problems and needs further study aspects.