改性镁渣基充填材料是一种新型全固废胶结充填材料，主要是由不同比例的镁渣、粉煤灰和煤矸石加水混合、搅拌制成，其中镁渣和粉煤灰作为胶凝材料替代传统胶结充填材料中的水泥。其理念的实施可以减少镁渣、矸石等固体废料的堆放，降低水泥的使用，节省煤矿充填的开支，为资源利用和煤矿充填提供了一个既绿色又高效的解决方法。

为了探究不同灰砂比、料浆浓度、粉煤灰掺量下，改性镁渣基充填材料的孔隙结构特征和力学特性。本文设置13组不同配比的改性镁渣基充填材料试件，利用核磁共振试验和宏观力学试验分别得到充填材料的孔隙结构参数和力学性能参数。最后，依据充填材料内部孔隙等初始缺陷对改性镁渣基充填材料力学性能的影响，提出了由孔隙率和平均孔径两个孔隙参数决定的损伤强化系数，建立了基于损伤强化系数的改性镁渣基充填体损伤本构模型。研究内容和结果如下：

（1）灰砂比、料浆浓度、粉煤灰掺量对改性镁渣基充填材料的孔隙结构和力学特性有很大的影响。其中，灰砂比、料浆浓度与充填材料的孔隙结构参数呈现负相关关系，与力学性能参数呈现正相关关系，也就是说，灰砂比和料浆浓度越大，改性镁渣基充填材料的孔隙率和平均孔径越小，单轴抗压强度、残余强度和弹性模量越大。

（2）粉煤灰掺量可以极大地影响镁渣-粉煤灰胶凝材料的胶凝性能。研究表明，当胶凝材料中含有40%的粉煤灰时，改性镁渣基充填材料孔隙发育最好，力学性能最优。当粉煤灰掺量大于40%时，改性镁渣基充填材料孔隙尺寸和孔隙率变大，力学性能变差。

（3）改性镁渣基充填材料的孔隙结构对其力学性能的影响很大，其中孔隙率和平均孔径与充填材料强度之间存在拟合效果良好的非线性关系。

（4）改性镁渣基充填材料在单轴受压状态下的破坏过程主要是主裂纹的出现、扩展、汇聚以及数量的增多引起的。结合损伤本构模型可知，当损伤变量约为0.25时，应力达到峰值，应力-应变曲线呈下降趋势，损伤增长速率变大，充填材料容易损坏。

（5）将通过理论模型计算得到的本构模型曲线与UCS试验曲线进行对比,结果表明：本文提出的改性镁渣基充填体损伤本构模型与单轴压缩试验结果吻合较好，能够有效描述改性镁渣基充填体在单轴受压状态下的损伤演变规律及应力-应变曲线的发展过程。

Modified magnesium slag-based filling material is a new type of solid waste cementing filling material, which is mainly made by mixing and mixing magnesium slag, fly ash and coal gangue in different proportions with water. Magnesium slag and fly ash are used as cementing materials to replace cement in traditional cementing filling materials. The implementation of the concept can reduce the stacking of solid wastes such as magnesium slag and gangue, reduce the use of cement, save the cost of coal mine filling, and provide a green and efficient solution for resource utilization and coal mine filling.
In order to explore the pore structure characteristics and mechanical properties of modified magnesium slag-based filling materials under different cement-sand ratio, slurry concentration and fly ash content. In this paper, 13 groups of specimens with different proportions of modified magnesium slag-based filling materials were set, and the pore structure parameters and mechanical property parameters of the filling materials were obtained by NMR test and macro mechanical test respectively. Finally, according to the influence of initial defects such as internal pores on the mechanical properties of the modified magnesium slag-based filling material, the damage strengthening coefficient determined by porosity and average pore diameter was proposed, and the damage strengthening constitutive model of the modified magnesium slag-based filling body was established based on the damage strengthening coefficient. The research contents and results are as follows：
(1) The cement to sand ratio, slurry concentration and fly ash content have great influence on the pore structure and mechanical properties of modified magnesium slag-based filling materials. Among them, the contrast ratio, concentration of slurry and the pore structure parameters of filling material is a negative correlation, and mechanics performance parameters appear positive correlation, that is to say, the contrast and slurry concentration, the greater the modified magnesium slag filling material of porosity and average pore diameter is smaller, the uniaxial compressive strength, residual strength and elastic modulus. 
(2) The content of fly ash can greatly affect the cementitious property of magnesium slag-fly ash cementitious material. The results show that when the cementitious material contains 40% fly ash, the pore development and mechanical properties of the modified magnesium slag-based filling material are the best. When the fly ash content is more than 40%, the pore size and porosity of the modified magnesium slag-based filling material become larger, and the mechanical properties become worse.
(3) The pore structure of the modified magnesium slag-based filling material has a great influence on its mechanical properties, and there is a nonlinear relationship between the porosity and average pore size and the strength of the filling material.
(4) The failure process of modified magnesium slag-based filling material under uniaxial compression is mainly caused by the appearance, expansion, convergence and increase of main cracks. Combined with the damage constitutive model, it can be seen that when the damage variable is about 0.25, the stress reaches the peak, the stress-strain curve shows a downward trend, the damage growth rate increases, and the filling material is prone to damage.
(5) The constitutive model of the curve is obtained by theoretical model calculation compared with UCS test curve, the results show that the proposed modified magnesium slag base filling body damage constitutive model and the uniaxial compression test results are in good agreement, can effectively describe the modification of magnesium slag base filling body under uniaxial compression condition of damage evolution law and the development process of the stress-strain curve.

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