数字图像相关法在相似材料模拟试验中的应用

利用相似材料模拟试验研究印度某矿长壁开采采场厚硬顶板的破断规律,针对试验中传统的位移测量法的不足,引入了数字图像相关法。通过恰当布设模型、合理控制光照强度,实时用高分辨率数码相机拍摄模型在开采过程中的表面变形图像,借用数字照相图像分析与结果可视化应用软件系统GeoDPDM对序列照片进行相关性分析,得到了开采过程中上覆岩层变形的位移场和应变场。将分析结果与传统测量方法所得结果对比,得到两种方法具有较高的一致性,并将测试精度提高到0.6mm/pixel,成功实现了大范围模型变形的全场、非接触式测量。

Application of Similar Material Simulating Experiment Based on DICM

Similar material simulating experiment was used to analyze failure characteristics of the overlying strata in a longwall-mined coal mine in India.DICM(digital image correlation method) was brought in similar material simulating experiment to compensate the lack of traditional mechanical point measurement.Through proper layout of mode and reasonable control of illumination intensity,a high-resolution digital camera was used to take real-time photos of the model surface deformation.A visual application system GeoDPDM based on DICM was used to analyze correlation in the series photos.The displacement field and strain field in overlying strata during mining process were obtained. Comparing the analysis results with the results obtained by traditional measurement,it is found that these two methods are consistent and measurement accuracy is improved up to 0.6mm/pixel with successful full-court and noncontact measurement of large-scale model deformation.