基于P波模量的原位胶结充填体强度预测模型研究

Study on strength prediction model of in-situ cemented backfill based on P-wave modulus

原位胶结充填体质量评价通常采用单轴抗压强度作为表征指标,由于在现场工程中无法快速、准确获取充填体的强度值,因此需要建立一种参数易于获取且准确的原位胶结充填体强度预测模型。基于胶结充填体物理力学参数的内在联系,从量纲平衡的角度探索了胶结充填体单轴抗压强度与P波模量的关系。根据C矿和I矿两种原位胶结充填体的密度、P波速度及取芯强度的测试数据,采用线性拟合的方法获得了基于P波模量的原位胶结充填体强度预测模型。通过对C矿和I矿的强度预测模型拟合效果分析可知,P波模量与取芯强度呈正相关性,且拟合效果较好,证明原位胶结充填体强度预测模型精度高,具有很强的实用性。

The uniaxial compressive strength is usually used as a characterization index for quality evaluation of in-situ cemented backfill.The backfill strength couldn’t be obtained quickly and accurately in the field engineering,hence,it is necessary to establish an in-situ cemented backfill strength prediction model for easily obtaining parameters.Based on internal links of physicomechanical parameters of in-situ cemented backfill,a relation between UCS and P-wave modulus was established from the perspective of dimensional balance.According to the test data of density,P-wave velocity and coring strength of in-situ cemented backfill of C and I mine,the strength prediction model based on P-wave modulus was obtained by the linear fitting method.The comparative analysis of the fitting effect of the strength prediction models indicated that the P-wave modulus was positively correlated with the coring strength,and the fitting effect was good,which proved the strength prediction model of the in-situ cemented backfill had high accuracy and strong practicability.