节理裂隙对磷块岩力学特性影响的数值模拟研究  

Numerical Simulation of the Effect of Joint Fissures on Mechanical Properties of Phosphorite

作　　者：朱元栩 张电吉[1,2] 吝曼卿[1,2] 周新涛 彭亚利 卢祥龙 ZHU Yuanxu;ZHANG Dianji;LIN Manqing;ZHOU Xintao;PENG Yali;LU Xianglong(School of Resources and Safety Engineering,Wuhan Institute of Technology,Wuhan 430074,China;Engineering Research Center of Phosphorus Resources Development and Utilization,Ministry of Education,Wuhan 430074,China;Hubei Xingfa Chemical Group Co.,Ltd.,Yichang 443700,China)

机构地区：[1]武汉工程大学资源与安全工程学院,湖北武汉430074 [2]磷资源开发利用教育部工程研究中心,湖北武汉430074 [3]湖北兴发化工集团股份有限公司,湖北宜昌443700

出　　处：《金属矿山》2024年第12期197-204,共8页Metal Mine

基　　金：国家磷资源开发利用工程技术研究中心开放基金项目(编号:NECP2022-08);湖北省中央引导地方科技发展专项(编号:2017ZYYD007);武汉工程大学教育创新基金项目(编号:CX2023173)。

摘　　要：在深部磷矿开采过程中,由于磷块岩裂纹的产生及不稳定扩展,使得地下采场及巷道出现岩爆等地质灾害,其中裂隙倾角及宽度可以改变磷块岩的受力状态,并对磷块岩的岩爆倾向性产生影响。以宜昌瓦屋Ⅳ矿段岩爆灾害作为工程背景,通过RFPA2D数值模拟软件对磷块岩不同裂隙倾角及宽度下的应力应变曲线、峰值强度、裂纹的扩展特征、岩石声发射随加载步曲线进行分析,探究不同裂隙倾角及宽度对磷块岩岩爆倾向性的影响及破坏特征。试验结果表明:随着裂隙倾角的增大,峰值强度和峰值应变逐渐降低,裂隙宽度对弹性模量的影响极小,峰值应力随裂隙宽度的增大而减小,且随裂隙倾角的增大,峰值应力水平逐渐趋于一致;随着裂隙倾角的增大,岩石发生破坏的模式逐渐从脆性破坏向塑性破坏过渡,裂隙倾角为0°、裂隙宽度在1.5 mm时的破坏模式发生突变,呈现倒“V”裂纹扩展特征,不同裂隙宽度下裂隙倾角为30°、60°和90°时的裂纹扩展特征相似;声发射能很好地监测岩石裂纹的产生和岩石发生破坏的过程,从声发射的出现时间和持续时间也可对比得出,随着裂隙倾角的增大,发生岩爆倾向性明显减弱。In the process of deep phosphate mining,rock burst and other geological disasters occur in underground stopes and roadways due to the occurrence and unstable expansion of cracks in phosphorus blocks,among which the inclination angle and width of cracks can change the stress state of phosphorus blocks and affect the rock burst tendency of phosphorus blocks.Taking the rock burst disaster in WawuⅣmine section of Yichang as the engineering background,the stress-strain curve,peak strength,crack propagation characteristics and rock acoustic emission curve with loading step under different crack inclination and width were analyzed by RFPA2D numerical simulation software,and the influence of different crack inclination and width on rock burst tendency and failure characteristics of phosphorus block were explored.The experimental results show that the peak strength and peak strain decrease gradually with the increase of crack angle,the effect of crack width on elastic modulus is very small,the peak stress decreases with the increase of crack width,and the peak stress level tends to be consistent with the increase of crack angle.With the increase of crack inclination angle,the failure mode of rock gradually changes from brittle failure to plastic failure.When the crack inclination angle is 0°and the crack width is 1.5 mm,the failure mode changes ab-ruptly,showing the inverted"V"crack growth characteristics.The crack growth characteristics are similar at different crack widths when the crack inclination angle is 30°,60°and 90°.Acoustic emission can well monitor the process of rock crack gen-eration and rock failure.The occurrence time and duration of acoustic emission can also be compared,and the tendency of rock burst is obviously weakened with the increase of crack inclination angle.

关 键 词：RFPA2D 裂隙倾角 裂隙宽度 破坏特征 岩爆倾向性 

分 类 号：TD313[矿业工程—矿井建设]