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Experimental study on compressive behavior of cemented paste backfill material with different water contents

Author:

WANG Yongyan,YU Zhuoqun,CUI Lizhuang

Author Unit:

1.School of Mechanical and Electrical Engineering,Qingdao University of Science and Technology; 2.Institute of Mechanics,Qingdao University of Science and Technology

Key Words:

green mine;cemented paste backfill; moisture content; uniaxial compression; nonlinearity mechanical properties
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随着我国矿产资源需求的持续攀升和绿色矿山建设的提速,膏体充填技术展现出广阔的应用前景。然而,关于膏体充填材料在不同含水状态下力学行为的研究较少。为研究不同含水率对低水泥含量膏体充填材料单轴压缩力学行为的影响,以全尾砂、水泥和水为材料制备了3%和5%两种水泥含量的充填体试件(水泥含量3%5%为水泥质量占尾砂质量的百分比),使用RPH-80型可控式恒温恒湿试验箱将试件分组改造成含水率分别为013%25%36%的充填体试件后,使用TAW-200多功能力学试验机进行恒定位移加载的单轴压缩试验。试验结果表明:随着含水率的升高,充填体的强度下降,且下降速度逐渐加快,使用二次多项式可以较好地拟合单轴抗压强度和含水率之间的关系,2种水泥含量试件的单轴抗压强度的下降趋势与速度较为相似,且5%水泥含量膏体充填体的抗压强度在不同含水率下始终高于3%水泥含量充填体。另一方面,随着含水率的升高,充填体弹性模量降低,峰值应变点先升高后降低。通过充填体非线性指数衡量不同含水率下膏体充填材料应力-应变曲线的非线性程度,发现2种水泥含量下的充填体均在含水率为25%时表现出较高的非线性,利用好充填材料非线性的特点有助于充填体的失效预警和提前干预,研究结果为深入认识膏体充填材料的单轴压缩力学行为和充填区安全问题提供了参考。


WANG Yongyan,YU Zhuoqun,CUI Lizhuang.Experimental stsudy on compressive behavior of cemented paste backfill material with different water contents[J].Coal Science and Technology,2022,50(6):219-224
No.06
June 15th,2022

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