A method for simulating three-dimensional sealing and clinging cracks inside rocks

Abstract

The invention provides a method for simulating three-dimensional closed and clung cracks in rocks. The method comprises the following steps: taking a complete transparent material, and selecting a position and a range of precast cracks in the transparent material; focusing laser to the position through a lens; in a focusing process, enabling the position to generate a cracking point when laser energy exceeds a damage threshold value of the material; repeating the process, focusing the laser at the periphery of the cracking point and generating one group of cracking points; continuously inputting the laser energy, and simultaneously enabling the generated cracking points to be subjected to continual damage expansion and connecting the cracking points to form a cracking surface; meanwhile, along with the input of the energy, continually carrying out the damage expansion on an outward edge of the cracking point at the outermost periphery to form one circle of crack expansion region (annular surface) to be connected with the cracking surface; forming the three-dimensional closed and clung cracks at the position of the precast cracks, and keeping an original shape of other parts of the transparent material. The method provided by the invention is reasonable and is rapid and efficient; other surplus cracks are not formed, and edges are ordered; a test piece is complete and is not damaged; the property of the test piece is close to that of a rock material, and the simulation degree is high.

Description

technical field

[0001] The invention belongs to the technical field of rock engineering damage prediction and safety, and relates to a method for simulating a three-dimensional closed and close crack inside a rock. Background technique

[0002] The problem of rock fracture is a basic problem in the engineering field. For example, large-scale rock fractures will cause earthquakes; internal cracks in rocks will expand until they are destroyed, which will cause disastrous consequences such as water conservancy, traffic tunnel collapse, and side slope landslides, threatening the safety of people's lives and properties. Therefore, the law of rock propagation and failure with cracks has always been an important issue concerned by the engineering community.

[0003] Material cracks can be divided into three categories according to the location of occurrence: three-dimensional closed cracks (also known as deep cracks), surface cracks and through cracks.

[0004] The definition of i...

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