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Identification methods of the deformation memory effect in the stress region above crack initiation threshold

机译：在高于裂纹启动阈值的应力区域中变形记忆效应的识别方法

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Deformation memory effect (DME) is one of the rock memory effects. One important application of the DME is to determine the in situ stress state. Compared to the traditional in situ stress measurements, the methods based on the DME are commercial and permit large number of measurements. Application of DME needs enough reliable identification methods. However, the existing methods sometimes are indistinct and the amount is insufficient. combined with three traditional methods including tangential modulus method, deformation rate analysis (DRA), acoustic emission method, two new potential methods were explored in the stress region above crack initiation threshold. One is based on the fractal dimension, called FD method. Another one is to take advantage of the lateral strain in the DRA method and the FD method, instead of using the axial strain. Based on the contact bond model in PFC~(2D), numerical model for granite sample was developed and cyclic uniaxial compressions were performed on it. Both the existing methods and new methods were used to detect the DME. The results demonstrate that the FD method is effective and reliable, result by DRA method with lateral strain is better than that with the axial strain, the tangential modulus method is not so distinct as other methods.
机译：变形记忆效应（DME）是岩石内存效应之一。 DME的一个重要应用是确定原位应力状态。与传统的原位应力测量相比，基于DME的方法是商业的，允许大量测量。 DME的应用需要足够的可靠识别方法。然而，现有方法有时是模糊的，金额不足。结合三种传统方法，包括切向模量法，变形率分析（DRA），声发射法，在高于裂纹启动阈值的应力区域中探讨了两种新的潜在方法。一种基于分形尺寸，称为FD方法。另一个是利用DRA方法和FD方法的横向应变，而不是使用轴向菌株。基于PFC〜（2D）中的接触键模型，开发了花岗岩样品的数值模型，并对其进行了环状的单轴按压。现有方法和新方法都用于检测DME。结果表明，FD方法是有效可靠的，通过横向应变的DRA方法结果优于轴向应变，切向模量法与其他方法不同。

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