基于多元非线性回归的井下采场充填体强度预测及评价

Estimation and Evaluation of Backfill Strength in Underground Stope Based on Multivariate Nonlinear Regression Analysis

充填系统试运行期间各采场充填配合比变化非常大,如何准确掌握井下各采场充填体强度对相邻采场开采的安全至关重要。采用L25(56)正交试验,开展25组充填配合比室内试验,测得了各配合比不同龄期充填体强度值,采用EXCEL及SPSS相结合的方法,推导出了充填体强度与料浆体积分数、水泥掺量、人工砂尾砂比的回归方程;根据136个充填配合比室内实验充填体强度值与实际生产测定值的统计,获得了两者之间的强度折减系数。采用上述回归方程及强度折减系数,计算出了充填系统试运行期间200余条不同充填配合比进路的充填体强度值。

Backfill mix ratio changes greatly among different stopes during the test running of backfill system, thus, accurate control of the backfill strength of particular stopes plays an important role in the safety of mining in adjacent stopes, which is also a general technical problem. In this paper, L25 （56） or- thogonal design was applied to conduct 25 laboratory mix tests in the backfill mix experiment, and the backfill strengths at different curing ages were tested. Meanwhile, EXCEL and SPSS were used together to present the regression equations of backfill strength and the slurry density, cement dosage, and ratio of artificial aggregate and tailings, respectively. Based on the statistics of 136 kinds of mix ratio, in- cluding the backfill strength test results in laboratory and the actual measured values in backfill applica- tion, the strength reduction factor of the two results was obtained. Based on the regression equations and strength reduction factor mentioned above, the backfill strength of more than 200 backfill mix ratio ac- cess were calculated under the test running period of backfill system. The analysis method introduced in this paper is applicable to calculate backfill strength with different mix ratio, and is highly adaptable andpractical for similar mines.