磷石膏基复合充填材料力学性能试验研究

发布时间：2018-03-25 02:21

本文选题：磷石膏　切入点：复合充填材料　出处：《金属矿山》2017年01期

【摘要】：针对黄麦岭露天转地下充填开采为背景,对该矿的磷石膏复合充填体进行室内单轴抗压强度正交试验,研究不同的料浆质量浓度、磷石膏、粉煤灰、水泥的含量及拌合水p H值等5个因素对充填材料力学性能的影响。对不同配比的复合充填体在分别养护7 d、14 d和28 d后的单轴抗压强度进行测试,同时研究各组配比的坍塌度和泌水率,通过DPS和MATLAB优化工具箱对试验数据进行多元回归分析,最终得到了复合充填材料的优化配比,研究结果表明:当质量浓度为77%、拌合水p H值为12.9,磷石膏、粉煤灰、水泥在比值为5∶12∶3时充填体强度为4.87MPa,坍塌度为208.82 mm。对优化配比进行了试验验证,表明28 d的充填体强度为5.13 MPa,对应坍塌度为196mm。该成果为黄麦岭矿利用磷石膏和粉煤灰提供了理论依据。
[Abstract]:In view of Huangmailing open-pit to underground filling mining as the background, the orthogonal test of laboratory uniaxial compressive strength of phosphogypsum composite backfill was carried out to study different slurry mass concentration, phosphogypsum, fly ash, etc. The effects of cement content and pH value of mixing water on the mechanical properties of filling materials were studied. The uniaxial compressive strength of composite fillers with different ratios was tested after curing for 7 days for 14 days and 28 days for 28 days, respectively. At the same time, the collapse degree and bleeding rate of each group were studied. The multivariate regression analysis of the test data was carried out by DPS and MATLAB optimization toolbox, and the optimum ratio of composite filling material was obtained. The results show that when the mass concentration is 77 and the mixing water pH value is 12.9, when the ratio of phosphogypsum, fly ash and cement is 5:12:3, the backfill strength is 4.87 MPA and the collapse degree is 208.82 mm. The results show that the filling strength of 28 days is 5.13 MPA and the corresponding collapse degree is 196 m. The results provide a theoretical basis for the utilization of phosphogypsum and fly ash in Huangmailing Mine.
【作者单位】：武汉理工大学资源与环境工程学院;金诚信矿业管理股份有限公司中南分公司;
【分类号】：TD853.34

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