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黄金科学技术 ›› 2017, Vol. 25 ›› Issue (2): 76-82.doi: 10.11872/j.issn.1005-2518.2017.02.076

• 采选技术与矿山管理 • 上一篇    下一篇

分级加载条件下深部灰岩蠕变试验及模型

肖伟晶1,2,陈辰1,李永欣1,王晓军1,2*,曹世荣1,韩建文1   

  1. 1.江西理工大学资源与环境工程学院,江西  赣州   341000;
    2.江西省矿业工程重点实验室,江西  赣州   341000
  • 收稿日期:2016-08-26 修回日期:2017-01-22 出版日期:2017-04-28 发布日期:2017-05-12
  • 通讯作者: 王晓军(1979-),男,山西晋中人,博士,副教授,从事矿山工程岩体稳定性分析与控制等方面的研究与教学工作。xiaojun7903@126.com
  • 作者简介:肖伟晶(1991-),男,江西高安人,硕士研究生,从事矿山工程岩体稳定性分析与控制等方面的研究工作。921046160@qq.com
  • 基金资助:

    国家自然科学基金项目“堆浸应力路径与化学置换过程散体矿堆力学特性弱化机制研究”(编号:51564012)和江西省科技支撑计划项目“急倾斜薄脉群钨矿床开采岩体失稳控制技术集成与示范”(编号:20141BBE50005)联合资助

Creep Experiment and Model of Deep Limestone Under Step Loading

XIAO Weijing1,2,CHEN Chen1,LI Yongxin1,WANG Xiaojun1,2,CAO Shirong1,HAN Jianwen1   

  1. 1.Faculty of Resource and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou    341000,Jiangxi,China;
    2.Jiangxi Key Laboratory of Mining Engineering,Ganzhou    341000,Jiangxi,China
  • Received:2016-08-26 Revised:2017-01-22 Online:2017-04-28 Published:2017-05-12

摘要:

通过对矿山深部灰岩开展分级加载单轴蠕变试验,获取了不同应力水平下轴向和径向蠕应变,基于试验结果,分析各分级应力水平下轴向蠕应变、径向蠕应变和体应变的变化规律,研究轴向和径向蠕应变与各分级总应变的比值关系,并将该比值依次定义为蠕变效应比Kz、Kh,二者之差为Kh-z。研究发现:随着应力水平的提高,各分级轴向和径向蠕应变均先增加后减小;当恒载应力小于51 MPa时,试样体积压缩, Kh-z在±0.28%范围内,表明轴向蠕变与径向蠕变效应彼此相当;当超过该应力水平后,试样扩容,Kz和Kh剧增,Kh-z由0.21%突增至2.64%,在试样发生蠕变破坏时达到峰值,表明与轴向蠕变相比,在扩容阶段径向蠕变效应更加明显。选用西原体模型来描述灰岩轴向蠕变特性,通过曲线拟合的最小二乘法求取蠕变模型参数,R2均值为0.931,拟合效果较好。

关键词: 岩石力学, 分级加载, 蠕变试验, 西原体模型

Abstract:

The uniaxial creep test with step loading is carried out for the deep limestone,the axial and radial creep strain of different stress levels are obtained.Based on the test results,the change laws of axial creep strain,radial crcep strain and volumetric strain under different stress levels are analyzed.In addition to,the ratios of the axial and radial creep strain to the total strain are studied,which are defined as the ratio of creep effect Kz and Kh,and the difference between those is Kh-z.The study found that with the increase of the stress level,the axial creep strain and radial creep strain increase first and then decrease.When the constant stress is less than 51 MPa,the sample volume is compressed, Kh-z are within the scope of ±0.28%.It shows that the axial creep effect and radial creep effect are equal.However,if the stress is exceeded,the sample will expand and kz,kh increase rapidly,kh-z increased from 0.21% to 2.64%.It will reach peak value when the creep failure of specimen occurs.The results show that the radial creep effect is more obvious in the expansion stage,compared with the axial creep.The fitting effect is better by describing the characteristics of limestone axial creep with visco-elastoplastic model,and use the method of least squares curve fitting to get the creep model parameters,the average value of  R2 is 0.931.

Key words: rock mechanics, step loading, creep experiment, visco-elastoplastic model

中图分类号: 

  • TD853

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