不同配合比下尾砂充填体的动载冲击破坏研究

发布时间：2018-06-30 01:57

本文选题：尾砂胶结体 + 灰砂比　；参考：《矿业研究与开发》2017年03期

【摘要】：以紫金山金铜矿分级尾砂作为充填骨料,按灰砂比1∶4,1∶8,1∶12,浆料浓度66%,70%,74%配制的胶结充填体试件共9组。采用SHPB杆对充填体进行单轴冲击试验,并与单轴压缩试验对比,以确定动载条件下充填体抵抗破坏的能力及特征。结果表明:充填体在动载情况下,其峰值应力与灰砂比和浓度的关系与静载条件下表现出相同的性质,但极限应力是静载的6~10倍。根据动载时充填体的本构关系曲线的特征,可以得出随着应变的增加,充填体在抵抗冲击时具有应变软化与强化的阶段,且各试件的应力应变曲线在最初上升阶段具有较好的重合性,判断其弹性模量具有较好的一致性,但应力的增幅并不一致,表现出差异性。根据对不同配比充填体的流动应变对比,可以判断出其变形能力与砂浆浓度、灰砂比成反比。充填体变形能力越强,破坏所吸收的能量值也越大。
[Abstract]:The gradation tailings of Zijinshan Gold and Copper Mine were used as filling aggregate. According to the ratio of ash to sand 1: 4: 1: 8: 12, the paste concentration was 6670% and 74% respectively. There were 9 groups of cemented filling body specimens. Using SHPB bar to carry out uniaxial impact test and comparing with uniaxial compression test to determine the ability and characteristics of the filling body to resist failure under dynamic load condition. The results show that the relationship between the peak stress and the ratio of ash to sand and the concentration of the filling body under dynamic loading is the same as that under the static loading condition, but the ultimate stress is 6 ~ 10 times of that of the static load. According to the characteristic of the constitutive relation curve of the filling body under dynamic load, it can be concluded that with the increase of the strain, the filling body has the stage of strain softening and strengthening when resisting the impact. The stress-strain curves of each specimen have a good coincidence at the initial rising stage, and the elastic modulus of the specimen has good consistency, but the increase of stress is not consistent, showing the difference. According to the contrast of flow strain of different proportion of filling body, it can be determined that the deformation ability is inversely proportional to the concentration of mortar and the ratio of lime to sand. The stronger the deformation capacity of the filling body, the greater the energy absorbed by the damage.
【作者单位】：江西理工大学资源与环境工程学院;紫金矿业集团股份有限公司;江西国泰五洲爆破工程有限公司;
【基金】：国家自然科学基金(51464015) 江西省教育厅科学技术研究项目(GJJ151519)
【分类号】：TD853.34;TD862.1

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