文章摘要
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,(1):180~183
人工结构面剪切试验及数值模拟分析
Shear Test and Numerical Simulation of Artificial Joints
投稿时间:2018-07-11  修订日期:2018-08-14
DOI:10.13961/j.cnki.stbctb.2019.01.029
中文关键词: 结构面  直剪试验  FLAC 3D数值模拟  三维形貌
英文关键词: rock mass joint  direct shear test  FLAC 3D numerical simulation  three-dimensional surface
基金项目: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)
作者单位
孙敬辉 成都理工大学 环境与土木工程学院, 四川 成都 610059
中国地质大学 工程学院, 湖北 武汉 430074 
郑罗斌 中国地质大学 工程学院, 湖北 武汉 430074 
吉锋 成都理工大学 环境与土木工程学院, 四川 成都 610059 
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中文摘要:
      [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。
英文摘要:
      [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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