不同三维形态结构面剪切蠕变特性研究

Study on Shear Creep Characteristics of the Discontinuities with Different 3D Morphologies.

作者信息

Zhang Qingzhao, Luo Zejun, Chen Ying, Wang Zhen

机构信息

Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China.

School of Business Administration, Shanghai Lixin University of Accounting and Finance, Shanghai 201620, China.

出版信息

Materials (Basel). 2023 Jan 1;16(1):405. doi: 10.3390/ma16010405.

DOI:10.3390/ma16010405

PMID:36614744

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9821949/

Abstract

The rheological phenomenon of rock mass affects the long-term safety of rock mass engineering. In this study, gneiss samples with different 3D morphologies are prepared by splitting tests and are tested through multi-step creep tests. The long-term strength of rock discontinuities is determined by using several methods. The test results show that as the 3D morphological parameter increases, the creep deformation, creep rate, and the duration of failure all decrease. The long-term strength of rock discontinuities is linearly related to the 3D morphological parameter. Based on the principle of damage mechanics for rock mass, a damage variable is introduced in the creep model, and an improved non-linear Burgers model is established. Research results are of great theoretical significance and practical value for the design, construction, and long-term safety of rock mass engineering.

摘要

岩体的流变现象影响着岩体工程的长期安全性。在本研究中，通过劈裂试验制备了具有不同三维形态的片麻岩试样，并通过多步蠕变试验进行测试。采用多种方法确定了岩石结构面的长期强度。试验结果表明，随着三维形态参数的增加，蠕变变形、蠕变率和破坏持续时间均减小。岩石结构面的长期强度与三维形态参数呈线性关系。基于岩体损伤力学原理，在蠕变模型中引入损伤变量，建立了改进的非线性伯格斯模型。研究成果对岩体工程的设计、施工及长期安全具有重要的理论意义和实用价值。