Leng Qiang, Chang Qingliang, Sun Yuantian, Zhang Biao, Qin Jianzhuang
School of Mines, China University of Mining and Technology, Xuzhou 221116, China.
Key Laboratory of Deep Coal Resource Mining, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, China.
Materials (Basel). 2022 Aug 26;15(17):5904. doi: 10.3390/ma15175904.
Gangue paste material is mainly composed of coal gangue with particle size, which is mixed with cement. Fly ash and additives can be added to change its performance. In this paper, the influence of each component on the mechanical properties of gangue paste material was studied by an orthogonal experiment. The conversion relationship among various indexes of mechanical properties of gangue paste material and the response surface prediction model were discussed. The results show that the mechanical properties of gangue paste materials are positively correlated with the content of cement, the content of fly ash and the mass concentration, which increase with the increase of the three factors, and show the primary and secondary relationship of the content of cement > the content of fly ash > the mass concentration. A response surface prediction model of mechanical property parameters is established, which includes the first order term of the influencing factors of gangue paste material and the first order interaction term between any two factors. In the response surface prediction model of uniaxial compressive strength, splitting tensile strength, cohesion and elastic modulus, the goodness of fit test coefficients are 0.998, 0.957, 0.970 and 0.997, respectively, which proves that the model has good goodness of fit. The research results provide basic parameters for paste filling mining practice, and also provide the basis for numerical simulation of filling body value.
煤矸石膏体材料主要由具有一定粒径的煤矸石与水泥组成，可添加粉煤灰及外加剂来改变其性能。本文通过正交试验研究了各组分对煤矸石膏体材料力学性能的影响，探讨了煤矸石膏体材料力学性能各指标间的换算关系及响应面预测模型。结果表明，煤矸石膏体材料的力学性能与水泥含量、粉煤灰含量及质量浓度呈正相关，随这三个因素的增加而增大，且呈现出水泥含量＞粉煤灰含量＞质量浓度的主次关系。建立了力学性能参数的响应面预测模型，该模型包含煤矸石膏体材料影响因素的一次项及任意两个因素之间的一阶交互项。在单轴抗压强度、劈裂抗拉强度、黏聚力和弹性模量的响应面预测模型中，拟合优度检验系数分别为0.998、0.957、0.970和0.997，证明该模型具有良好的拟合度。研究结果为膏体充填开采实践提供了基础参数，也为充填体数值模拟提供了依据。
