基于图像三维建模快速求解岩石破裂面面积的新方法及其应用

The New Method for Rapid Determining Rock Fracture Surface Area Based on Image 3D Modeling and Its Application

摘要: 精准确定岩石力学试样中岩石试件破坏后不规则破裂面的面积对试验结果的可靠性具有重要影响，克服现有方法过程复杂、投入大以及耗时长的弊端，提出了一种基于图像的三维建模快速求解岩石试件破裂面面积的新方法。该方法仅需使用相机在不同空间位置获得一组同一目标的图像，然后用实景建模软件Reality Capture计算图像数据得到目标表面的三维坐标信息，生成点云数据，完成三维模型构建，再结合具有测量功能的软件如Auto Cad和3ds Max，即可快速完成岩石试件破裂面面积等数据的测量。精度评估试验表明，通过该方法获得的不规则破裂面积与真实面积的平均误差仅为1.77%，具有令人满意的精确程度。以室内岩石劈裂试验应用为例，显示该方法具有操作简单、高效快捷的特点，在岩土工程试验等领域确定不规则破裂面面积方面具有值得期待的应用前景。

Abstract: To accurately determine the area of irregular fracture surface of the rock specimen in rock me-chanical test has an important impact on the reliability of the test results. Overcoming the disad-vantages of existing methods, such as complex process, large input and long time consuming, a new method is proposed for rapidly determining the area of the fracture surface of the rock specimen based on image 3D modeling. The method only needs to use an camera to obtain a set of images of the same target at different spatial locations, and then use the real-world modeling software Reality Capture to calculate the image data to obtain the 3D coordinate information of the target surface, generate the point cloud data, and complete the 3D model construction, and then combine with software with measurement functions such as auto cad and 3ds Max to quickly complete the area of the fracture surface of the rock specimen. The measurement of the fracture surface area of the rock specimen can be done quickly by combining with software such as Auto Cad and 3ds Max. The results of accuracy assessment test show that the average error between the irregular fracture area obtained by this method and the real area is only 1.77%, which has a satisfactory degree of accuracy. Applied to the indoor rock splitting test, the results show that the method is easy to operate, efficient and fast, and has promising applications prospect in determining the area of irregular fracture surfaces in geotechnical engineering tests and other fields.