人工结构面剪切试验及数值模拟分析

孙敬辉; 郑罗斌; 吉锋

doi:10.13961/j.cnki.stbctb.2019.01.029

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人工结构面剪切试验及数值模拟分析

试验研究

- 人工结构面剪切试验及数值模拟分析
- Shear Test and Numerical Simulation of Artificial Joints
- 水土保持通报 2019年39卷第1期页码：180-183
- 作者机构：
  
  1. 成都理工大学环境与土木工程学院,四川,成都,610059
  2. 中国地质大学工程学院,湖北,武汉,430074
- 作者简介：
- 基金信息：
  
  地质灾害防治与地质环境保护国家重点实验室自由探索课题资助"结构面直剪试验研究"（SKLGP2017Z008）
- DOI：10.13961/j.cnki.stbctb.2019.01.029
  中图分类号：
- 纸质出版：2019
- 稿件说明：
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孙敬辉, 郑罗斌, 吉锋. 人工结构面剪切试验及数值模拟分析[J]. 水土保持通报, 2019,39(1):180-183.

Sun Jinghui, Zheng Luobin, Ji Feng. Shear Test and Numerical Simulation of Artificial Joints[J]. Bulletin of Soiland Water Conservation, 2019, 39(1): 180-183.
孙敬辉, 郑罗斌, 吉锋. 人工结构面剪切试验及数值模拟分析[J]. 水土保持通报, 2019,39(1):180-183. DOI： 10.13961/j.cnki.stbctb.2019.01.029.

Sun Jinghui, Zheng Luobin, Ji Feng. Shear Test and Numerical Simulation of Artificial Joints[J]. Bulletin of Soiland Water Conservation, 2019, 39(1): 180-183. DOI： 10.13961/j.cnki.stbctb.2019.01.029.

摘要

[目的]深入研究岩石结构面在剪切力学行为中三维形貌对抗剪强度的影响，揭示结构面的抗剪实质，为进一步认识结构面的性质提供依据。[方法]采用三维激光扫描仪和3 D打印机完全重铸了人工制作的结构面试样，并且在室内进行5级法向应力下的直剪试验，记录下剪切前后的表面形貌。并且用FLAC 3D数值模拟软件模拟结构面在不同法向压力下的剪切力学运动，分析和总结剪切应力在结构面表面的分布规律。[结果]结构面的峰值抗剪强度与法向压力和结构面三维形貌有关，在同一剪切力作用下，法向应力越大，剪切接触面积越大，剪切应力的大小和范围都增大，结构面表面高处的小凸起体被大量剪断，而在较低处的小凸起体损坏区则不明显，表明较高处的结构面凸起体较容易被剪断。[结论]随着法向压力的增大，剪切应力的大小和范围都增大，区域并没有太明显的改变。

Abstract

[Objective] To study the effect of three-dimensional topography on shear strength and reveal the shear essence of structural plane

in order to provide the basis for understanding the properties of structural plane. [Methods] A 3D laser scanner and a 3D printer was used to completely recast the artificially fabricated structural interview samples. The direct shear test was conducted indoors under the normal stress level 5

to record the surface topography change before and after shearing. The FLAC 3D numerical simulation software was used to simulate the shear mechanical movement of the structural plane under different normal pressures. The distribution of shear stress on the surface of structural plane was analyzed and summarized. [Results] The peak shear strength of the structural plane was related to the normal pressure and three-dimensional topography of the structural plane. Under the same shearing force

with the larger normal stress

the shearing contact area

the shearing stress and the scope of the shearing stress were larger. The small bulge at the top of the structural plane surface was significantly sheared

but the damage area of the small bulge at the lower part was not obvious

indicating that the bulge at the higher part of the structural plane was easier to be sheared. [Conclusion] With the increase of normal pressure

the magnitude and range of shear stress increase

but the region does not change obviously.

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references

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