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A tensile damage model for rocks: Application to blast induced damage assessment

机译：岩石的拉伸损伤模型：在爆炸引起的损伤评估中的应用

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摘要

In this paper, an experimental methodology is presented using digital image techniques to assess the internal microcracks and to quantify the rock damage within rock cores. The second part of the work is devoted to the numerical estimation of the tensile blast induced damage evolution law. The set up methodology is then applied to a set of limestone cores which were sampled before and after a real field blast round. The image analysis algorithm which was developed during the present work is based on a segmentation technique that uses a particular thresholding. Petrographic parameters, such as crack number, orientation, extension, centroid position were computed as a first step aiming at a fine characterization of the cracked medium. The most important estimated parameter is the specific crack area which is defined as the ratio between the crack area and the total image area. This parameter was taken as the rock internal damage. A dynamic tensile damage ordinary partial differential equation is numerically solved and calibrated with the obtained data in order to derive a general blast induced damage evaluation law within the muckpile blocks. The application of the numerical algorithm to cores coming from sampled blocks before and after real field blasts allowed the estimation of damage parameter and dynamic stress evolution histories as well as an estimation of the microfracturing activation and growth energies used during the blast.
机译：在本文中，提出了一种使用数字图像技术评估内部微裂纹并量化岩心内岩石损伤的实验方法。工作的第二部分致力于拉伸爆炸引起的损伤演化规律的数值估计。然后将设置方法应用于一组石灰石岩心，这些岩心在实地爆破之前和之后进行采样。在当前工作中开发的图像分析算法基于使用特定阈值的分割技术。作为第一步，计算岩石学参数，如裂纹数，取向，延伸，质心位置，旨在精细表征裂纹介质。最重要的估计参数是特定的裂缝面积，它定义为裂缝面积与总图像面积之比。该参数被视为岩石内部损伤。对动态拉伸损伤常态偏微分方程进行数值求解，并用获得的数据进行标定，以得出一般爆炸引起的损伤评估定律。将数值算法应用于实地爆破之前和之后来自采样块的岩心，可以估算损伤参数和动态应力演化历史，以及估算爆炸期间使用的微破裂活化和生长能量。

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