岩石力学参数的DSCM-FEM方法研究  

Study of Rock Mechanical Parameters by DSCM-FEM Method

作　　者：范辉远 张苑玉 王腾腾 赵亚周 邓文良 FAN Huiyuan;ZHANG Yuanyu;WANG Tengteng;ZHAO Yazhou;DENG Wenliang(School of Civil Engineering,North China University of Technology,Beijing 100144,China)

机构地区：[1]北方工业大学土木工程学院,北京100144

出　　处：《煤炭技术》2025年第4期37-41,共5页Coal Technology

摘　　要：将数字散斑相关法与有限元数值模拟相结合,目标函数以试验位移场与模拟位移场的差异来表征,得到力学参数反演方法。该方法目前存在较大的误差,主要受优化算法目标函数影响。由于无法确定试件的真实力学参数,难以评估力学参数反演结果的精度。提出了一种新的判别方法,通过确定的力学参数生成理论位移场,并将其用于生成散斑图像,将此散斑图像作为“实验”所得图像进行反演,得到力学参数,从而比较不同目标函数的优劣。结果表明:(1)通过与理论位移场的比较,验证了新判别方法的可行性和合理性;(2)对比不同目标函数,发现以计算点的应变误差平均值作为目标函数,能够实现更高的反演精度;(3)在弹性阶段,弹性模量和泊松比几乎不发生变化,黏聚力变低,内摩擦角变大;在塑性阶段,弹性模量不断快速减小,泊松比略有减小,黏聚力先增大后减小,内摩擦角快速减小。The digital speckle correlation method is combined with the finite element numerical simulation,and the objective function is characterized by the difference between the test displacement field and the simulated displacement field,and the inversion method of mechanical parameters is obtained.At present,this method has a large error,which is mainly affected by the objective function of the optimization algorithm.It is difficult to assess the accuracy of the mechanical parameter inversion results because the true mechanical parameters of the specimen cannot be determined.The theoretical displacement field is generated by the determined mechanical parameters,which is used to generate the speckle image.This speckle image is used as the"experimental"image for inversion to obtain the mechanical parameters,so as to compare the advantages and disadvantages of different objective functions.The results show that:(1)compared with the theoretical displacement field,the new discriminant method is feasible and reasonable;(2)comparing different objective functions,it is found that using the average strain error of the calculated point as the objective function can achieve higher inversion accuracy;(3)in the elastic stage,the elastic modulus and Poisson′s ratio almost do not change,the cohesion becomes lower,and the internal friction angle becomes larger.In the plastic stage,the elastic modulus decreases continuously and rapidly,the Poisson′s ratio decreases slightly,the cohesion increases first and then decreases,and the internal friction angle decreases rapidly.

关 键 词：反演方法 理论位移场 目标函数 数字散斑相关方法 位移场 

分 类 号：TD315[矿业工程—矿井建设]