胶结充填体波速-密度双参数强度预测模型研究

Study on the Prediction Model of the Strength of Cemented Backfill Based on Wave Velocity and Density

抗压强度是表征胶结充填体力学性质的重要指标,是确定采场充填方案的基本依据,快速、准确地确定胶结充填体抗压强度值,对于保障采场安全意义重大。分析了胶结充填体强度的影响因素,为克服单一预测指标的不准确性和预测指标过多的复杂性,选取了较易获取的胶结充填体初始超声波波速和密度两个参数,构建了波速-密度双参数预测指标T,运用预测指标构建了胶结充填体强度预测模型,并进行了验证。研究表明:①胶结充填体单轴抗压强度的影响因素有组成成分、结构尺寸以及养护环境,主要影响因素为组成成分;②将试验数据应用所构建的强度预测模型、典型强度预测模型分别进行了曲线拟合,对比分析得出所构建的强度预测模型拟合结果良好,相关系数均达到0.98以上,可以较好地预测胶结充填体强度。利用波速-密度双参数进行胶结充填体强度预测具有可行性,为准确预测胶结充填体强度提供了新的思路。

Compressive strength is an important index to characterize the mechanical properties of cemented backfill.It is the basic basis for determining the filling scheme of the stope.Therefore,it is of great significance to determine the compressive strength value of cemented backfill quickly and accurately.The influencing factors of the strength of cemented backfill are discussed,in order to overcome the inaccuracy of single prediction factor and complexity of excessive prediction factors,two parameters of initial ultrasonic wave velocity and density of cemented backfill that are easier to obtained are selected.The wave velocity-density double parameter prediction index T is established,then,the strength prediction model of cementation backfill is indicated by using the predictive index,and the performance of the model is verified.The study results show that:①the influence factors of the uniaxial compressive strength of cemented backfill including composition,structural size and curing environment,the main influencing factors is composition;②curve fitting analysis of the test data is done by using the strength prediction model established in this paper and typical strength prediction respectively,the comparative analysis results show that the curve fitting effects of the newly established model is better than the other,the correlative coefficient is above 0.98,which further indicated that the strength prediction model newly established can effectively predict the strength of cemented backfill.The above study results indicated that the it is feasible to predict the strength of cemented backfill with two parameters of wave velocity and density,therefore,the new ideal for accurately predicting the strength of cemented backfill.