JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A

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Grid-growth method for the reconstruction of 3D rock joints with arbitrary joint roughness and persistence

Author(s): Hanyu CHEN, Peng GUO, Guangyao LI, Lifeng FAN
Affiliation(s): Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China
Corresponding email(s): fanlifeng@bjut.edu.cn
Key Words: 3D rock joint reconstruction; Joint roughness; Joint persistence; Asperity; Rock bridge

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Abstract: We present a grid-growth method to reconstruct 3D rock joints with arbitrary joint roughness and persistence. In the first step of this workflow, the joint model is divided into uniform grids. Then by adjusting the positions of the grids, the joint morphology can be modified to construct models with desired joint roughness and persistence. Accordingly, numerous joint models with different joint roughness and persistence were built. The effects of relevant parameters (such as the number, height, slope of asperities, and the number, area of rock bridges) on the joint roughness coefficient (JRC) and joint persistence were investigated. Finally, an artificially split joint was reconstructed using the method, and the method’s accuracy was evaluated by comparing the JRC of the models with that of the artificially split joint. The results showed that the proposed method can effectively control the JRC of joint models by adjusting the number, height, and slope of asperities. The method can also modify the joint persistence of joint models by adjusting the number and area of rock bridges. Additionally, the JRC of models obtained by our method agrees with that of the artificially split surface. Overall, the method demonstrated high accuracy for 3D rock joint reconstruction.

重构任意节理粗糙度和贯通度三维岩石节理的网格生长方法

作者：陈含宇，郭鹏，李光耀，范立峰
机构：北京工业大学，建筑与土木工程学院，中国北京，100124
目的：岩石节理面的形貌对节理岩体的力学特性具有重要的影响。本文旨在提出一种重构真实三维岩石节理形貌的方法，实现快速重构任意节理粗糙度和贯通度下的三维岩石节理，为节理岩体力学特性分析提供更为精确的模型。
创新点：1.提出一种三维岩石节理重构的网格生长法；2.同时考虑三维岩石节理的节理粗糙度和贯通度；3.基于该方法成功重构人工劈裂节理。
方法：1.将节理模型划分为均匀的网格，通过调整网格位置，重构具有任意节理粗糙度和贯通度的岩石节理模型（图1~3）；2.建立不同节理粗糙度和贯通度的岩石节理模型，研究相关参数（如凸体的数量、高度和坡度，以及岩桥的数量和面积）对节理粗糙度系数（JRC）和贯通度的影响（图4~8）；3.重构人工劈裂节理，通过对比重构模型的JRC与人工劈裂节理的JRC，验证所提方法的准确性和有效性（图9~11）。
结论：1.本方法可以通过调节凸体的数量、高度和坡度来有效控制模型的节理粗糙度；2.本方法可以通过调节岩桥的数量和面积来有效控制模型的节理贯通度；3.基于本方法重构的节理模型与人工劈裂节理模型在节理粗糙度上吻合良好，本方法在三维岩石节理重构方面具有较高的准确性。

关键词组：三维岩石节理重构；节理粗糙度；节理贯通度；凸体；岩桥

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重构任意节理粗糙度和贯通度三维岩石节理的网格生长方法

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