矿井水腐蚀对充填膏体强度影响的试验研究

Experimental Study on the Influence of Mine Water Corrosion over Filling Paste Strength

为分析矿井水腐蚀对充填膏体强度的影响,分别采用浓度为10%、20%的Na Cl、Na2SO4和Mg SO4三种溶液对充填膏体进行了腐蚀,分析了矿井水腐蚀对充填膏体强度的影响,并基于试验现象从化学反应和物理结晶角度探讨了矿井水腐蚀对充填膏体强度的影响机理,建立了充填膏体在矿井水腐蚀作用下强度变化的数学模型。研究结果表明:受Cl-、SO2-4和Mg2+腐蚀作用的影响,充填膏体出现了强度先升高后降低的现象,出现强度最大值用时较短,进入强度降低阶段后强度降低速度较快;Na2SO4溶液对充填膏体影响最大,其次为Mg SO4溶液,再次为Na Cl溶液,充填膏体受腐蚀后强度降低幅度与溶液浓度正相关,建立的数学模型能够反映充填膏体受腐蚀后的强度演化规律。

In order to analyze the influence of mine water corrosion over filling paste strength, NaCl solution, Na2SO4 solution, and MgSO4 solution, whose concentrations of 10% and 20% , are used to corrode filling paste. In addition, energy is devoted to analyzing the influence of mine water corrosion over filling paste strength as well as to explore its influencing mechanism from the perspective of chemical reactions and physical crystallization based on test phenomena and a mathematical model for strength evolution has been built. According to the experimental result filling paste witnesses increase and then a decrease in strength under the influence of the corrosion of Cl^-, SO4^2- and Mg^2＋ , filling paste strength, whose maximum value emerges rapidly, will suffer a rapid decrease when entering the declining stage. Na2SO4 solution exerts the largest influence over filling past, followed by MgSO4 solution and then by NaCl solution. After corrosion, the decline in filling paste strength will be positively correlated with solution concentration. The mathematical model having the ability to reflect the strength evolution rule of filling paste.