一维静载与频繁扰动共同作用下含铜蛇纹岩动力学特性

发布时间：2018-06-13 02:19

本文选题：含铜蛇纹岩 + 一维静载　；参考：《振动与冲击》2016年09期

【摘要】：基于冬瓜山铜矿深部开采面临的高应力集中及爆破扰动的问题,采用改进的SHPB岩石动静组合加载试验系统,进行了含铜蛇纹岩在一维静载与频繁扰动共同作用下的动力学试验,研究其动力学特性。研究结果表明:预加轴压促使岩石内部微裂纹完全闭合时,岩石动态应力-应变曲线初始阶段不出现下凹现象,否则出现;岩石内部存储的弹性力大于扰动冲击应力时,岩石动态应力-应变曲线峰值应力后会出现回弹现象,否则不出现;动态峰值应力、动态变形模量随扰动冲击次数的增大而减小,60%单轴抗压强度的轴压时峰值应力最大;峰值应力均值随轴压的增大先增大后减小;最大应变、峰值应力对应应变随扰动冲击次数的增大而增大;累计扰动冲击次数最大值与均值都随轴压增大呈一元四阶多项式关系递减。
[Abstract]:Based on the problems of high stress concentration and blasting disturbance in deep mining of Dongguashan Copper Mine, the dynamic tests of copper-bearing ophiolite under one dimensional static load and frequent disturbance were carried out by using an improved SHPB rock dynamic and dynamic loading test system. Its kinetic characteristics are studied. The results show that there is no concave in the initial stage of the dynamic stress-strain curve when the microcracks are closed completely by pre-axial compression, otherwise, the elastic force stored in the rock is larger than the perturbed impact stress. After the peak stress of dynamic stress-strain curve of rock, there will be springback phenomenon, otherwise, the peak stress of dynamic peak stress and dynamic deformation modulus will decrease with the increase of perturbed impact times, and the peak stress of 60% uniaxial compressive strength will decrease. The mean value of peak stress increases first and then decreases with the increase of axial compression, and the maximum strain and peak stress corresponding to strain increase with the increase of the number of perturbed shocks. The maximum and mean values of cumulative perturbed shocks decrease with the increase of axial pressure in the first and fourth order polynomials.
【作者单位】：中南大学资源与安全工程学院;
【基金】：国家重点基础研究发展计划(973)项目(2010CB732004)
【分类号】：TD313

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