摘要
为了解溜井井壁在储矿、卸矿两种状态下的侧压力分布特征及差异,以海南石碌铁矿2^(#)主溜井为研究对象,基于Janssen公式建立了井壁压力与标高的关系,同步建立了溜井动态、静态压力监测平台,模拟溜井贮矿段储料及放矿过程,监测压力变化特征,分析了静态及动态压力分布及差异,讨论了Janssen公式应用的局限性及问题,并结合研究结果提出了关键性建议。结果表明:随着测量高度的增加,井壁静态侧压力逐渐减小,动态压力值大于静态压力,动态井壁侧压力呈先增加后减小的趋势,在测点高度为1.26 m时达到峰值为16.289 kPa,储料面附近最小,为3.073 kPa。“超压现象”造成了动、静压力之间的显著差异性。Janssen公式基本能够描述井壁静态侧压力与测量标高的关系,但存在一定的局限性,源于卸矿冲击夯实作用、上覆矿岩压实作用、底部结构及矿岩压力等,这些因素造成储料内部压力、容重等参数小范围动态变化,造成Janssen公式模型产生计算误差。此外,在使用Janssen公式计算动态压力值时,应注意超压系数是一个与测点高度相关的动态值;提出标高为22~26 m范围使用内套钢板混凝土井壁修复方式、储料高度应在30 m以上、控制矿岩块度、匀速卸矿等工程管理建议,以确保2^(#)主溜井贮矿段长期稳定运行。研究结果对溜井井壁磨损评估具有一定的理论意义,同时有助于保障溜井矿岩运输连续性,提高溜井使用寿命。
In order to understand the side pressure distribution characteristics and differences of the ore-pass wall under the two conditions of ore storage and unloading,the No.2 main ore-pass of Shilu Iron Mine in Hainan was taken as the research object.Based on the Janssen formula,the relationship between the borehole wall pressure and the elevation was established.The dynamic and static pressure monitoring platform of the ore-pass was established simultaneously.The storage and drawing process of the ore storage section of the ore-pass was simulated,and the pressure variation characteristics were monitored.The distribution and difference of static and dynamic pressure were analyzed.The limitations and problems of the application of the Janssen formula were discussed,and the key suggestions were put forward based on the research results.The results show that with the increase of the measurement height,the static side pressure of the borehole wall gradually decreases,the dynamic pressure value is greater than the static pressure,and the dynamic side pressure of the borehole wall increases first and then decreases.When the height of the measuring point is 1.26 m,the peak value is 16.289 kPa,and the dynamic side pressure near the storage surface is the smallest,which is 3.073 kPa.The overpressure phenomenon causes a significant difference between the dynamic and static pressures.The Janssen formula can basically describe the relationship between the static side pressure of the borehole wall and the measurement elevation,but there are some limitations,which are derived from the impact compaction of ore unloading,the compaction of overlying ore rock,the bottom structure and the pressure of ore rock.These factors cause a small range of dynamic changes in the parameters such as the internal pressure and bulk density of the storage material,resulting in the calculation error of the Janssen formula model.In addition,when using the Janssen formula to calculate the dynamic pressure value,it should be noted that the overpressure coe
作者
付吉顺
郑树衡
马驰
王艺
郭国龙
王培涛
陈天奎
FU Jishun;ZHENG Shuheng;MA Chi;WANG Yi;GUO Guolong;WANG Peitao;CHEN Tiankui(JCHX Mining Management Co.,Ltd.,Beijing 101500,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Hainan Mining Co.,Ltd.,Changjiang,Hainan 572700,China)
出处
《矿业研究与开发》
CAS
北大核心
2024年第5期59-65,共7页
Mining Research and Development
基金
国家自然科学基金项目(52074020)
国家重点研发计划2023年度重点专项(2023YFC2907401)。
关键词
溜井贮矿段
井壁侧压力
Janssen公式
物理试验
Ore-pass storage section
Side pressure of borehole wall
Janssen formula
Physical test
