Stability analysis of a free-standing backfill wall and a predictive equation for estimating the required strength of a backfill material - a numerical modelling approach

IF 0.9 4区材料科学 Q3 Materials Science

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-06-10 DOI:10.17159/2411-9717/1544/2022

J. L. Porathur, S. Sekhar, A. Godugu, S. Bhargava

{"title":"Stability analysis of a free-standing backfill wall and a predictive equation for estimating the required strength of a backfill material - a numerical modelling approach","authors":"J. L. Porathur, S. Sekhar, A. Godugu, S. Bhargava","doi":"10.17159/2411-9717/1544/2022","DOIUrl":null,"url":null,"abstract":"Cemented backfilling has enabled underground hard rock mines to extract orebodies more safely with improved ore recovery. It is important to estimate the minimum required strength parameters for a backfill mix by optimizing the binder percentage to enable cost-effective and safe stoping operations. We conducted three-dimensional numerical modelling to study the effect of various stoping parameters on the stability of a free-standing backfill wall. A Mohr-Coulomb material model was used for the backfill material and the rock-fill interface. A strength reduction technique, excluding friction angle, was employed to arrive at a minimum stable strength value for the backfill. For a given combination of strength values, the stability state of the backfill wall could be demarcated using a displacement and yield zone tracking method. The numerical modelling results are compared to some earlier theoretical models. From the simulations, a predictive equation is developed to predict the required strength parameters for a backfill mix to ensure a stable free-standing wall. Examples are given of the successful use of the predictive equation at some underground hard rock mine sites in India.","PeriodicalId":17492,"journal":{"name":"Journal of The South African Institute of Mining and Metallurgy","volume":" ","pages":""},"PeriodicalIF":0.9000,"publicationDate":"2022-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of The South African Institute of Mining and Metallurgy","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.17159/2411-9717/1544/2022","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"Materials Science","Score":null,"Total":0}

引用次数: 1

Abstract

Cemented backfilling has enabled underground hard rock mines to extract orebodies more safely with improved ore recovery. It is important to estimate the minimum required strength parameters for a backfill mix by optimizing the binder percentage to enable cost-effective and safe stoping operations. We conducted three-dimensional numerical modelling to study the effect of various stoping parameters on the stability of a free-standing backfill wall. A Mohr-Coulomb material model was used for the backfill material and the rock-fill interface. A strength reduction technique, excluding friction angle, was employed to arrive at a minimum stable strength value for the backfill. For a given combination of strength values, the stability state of the backfill wall could be demarcated using a displacement and yield zone tracking method. The numerical modelling results are compared to some earlier theoretical models. From the simulations, a predictive equation is developed to predict the required strength parameters for a backfill mix to ensure a stable free-standing wall. Examples are given of the successful use of the predictive equation at some underground hard rock mine sites in India.

查看原文本刊更多论文

独立回填墙稳定性分析及回填材料强度预测方程——数值模拟方法

胶结回填使地下硬岩矿山能够更安全地提取矿体，并提高了矿石回收率。重要的是，通过优化粘结剂百分比来估计回填混合料所需的最小强度参数，以实现成本效益和安全的回采作业。我们进行了三维数值模拟，研究了各种回采参数对独立回填墙稳定性的影响。回填材料和填石界面采用莫尔-库仑材料模型。采用强度折减技术（不包括摩擦角）来获得回填的最小稳定强度值。对于给定的强度值组合，可以使用位移和屈服区跟踪方法来标定回填墙的稳定状态。将数值模拟结果与一些早期的理论模型进行了比较。通过模拟，开发了一个预测方程来预测回填混合料所需的强度参数，以确保稳定的独立墙。举例说明了预测方程在印度一些地下硬岩矿场的成功应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of The South African Institute of Mining and Metallurgy 工程技术-矿业与矿物加工

CiteScore

1.50

自引率

11.10%

发文量

审稿时长

4-8 weeks

期刊介绍： The Journal serves as a medium for the publication of high quality scientific papers. This requires that the papers that are submitted for publication are properly and fairly refereed and edited. This process will maintain the high quality of the presentation of the paper and ensure that the technical content is in line with the accepted norms of scientific integrity.