考虑裂隙变形参数的岩体单轴压缩损伤模型

刘红岩; 张光雄; 邹宗山; 和铁柱

doi:10.16030/j.cnki.issn.1000-3665.202208017

考虑裂隙变形参数的岩体单轴压缩损伤模型

doi: 10.16030/j.cnki.issn.1000-3665.202208017

1.
中国地质大学（北京）工程技术学院，北京　100083
2.
保利民爆哈密有限公司，新疆哈密　839000

基金项目: 北京市自然科学基金项目（8222031）；哈密市科技计划项目（hm2021kj08）；国家重点研发计划项目（2019YFC1509701）

详细信息

作者简介:
刘红岩(1975-)，男，博士，教授，主要从事岩体损伤与断裂方面的研究与教学工作。Email：lhyan1204@126.com

中图分类号: O319.56
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出版历程
- 收稿日期: 2022-08-10
- 修回日期: 2022-09-29

A uniaxial compression damage model for rockmass considering the crack deformation parameter

1.
School of Engineering and Technology, China University of Geosciences （Beijing）, Beijing　100083, China
2.
Poly Explosive Hami Co., Ltd., Hami, Xinjiang　839000, China

摘要

摘要: 为了更准确地预测裂隙对岩体压缩力学特性如强度和刚度的影响，需要建立更为合理的裂隙岩体压缩损伤模型。为此，基于相关试验数据和裂隙岩体单轴压缩力学行为，采用损伤及断裂理论对目前断续裂隙岩体压缩损伤模型中存在的不足进行了深入分析，并对其进行了3方面的改进，即：不再将裂隙变形参数视为定值、考虑了裂隙面上法向正应力产生的负第一应力强度因子K_I、考虑了裂隙面上有效剪应力产生的K_I，由此最终提出了考虑裂隙变形参数的岩体单轴压缩损伤本构模型。最后采用试验数据对该模型的合理性进行了验证，发现与现有模型相比，该模型对岩体单轴压缩弹性模量和损伤值的预测精度有明显提高，尤其是当裂隙倾角为0°时，该模型计算得到的弹性模量为4.306 MPa，与实测弹性模量4.310 MPa几乎相同。因此，该模型能够很好地刻画岩体单轴压缩力学行为，这也说明考虑裂隙变形参数对岩体单轴压缩力学特性的影响是十分必要的。该研究可为准确预测裂隙岩体的单轴压缩力学行为提供参考。
- 断续裂隙岩体 /
- 应力强度因子 /
- 单轴压缩损伤模型 /
- 损伤变量 /
- 裂隙变形参数
Abstract: In order to accurately predict the effect of crack on the rockmass compression mechanical property such as strength and stiffness, a more reasonable compression damage model for the cracked rockmass is needed to be established. On basis of the relevant experimental data and mechanical behavior of the cracked rockmass under uniaxial compression, some deficiencies in the existing compression damage models for the rockmass with intermittent cracks are analyzed in detail. Three improvements are made to improve the existing methods, e.g., the crack deformation parameter cannot be taken as a constant, the negative first stress intensity factor K_I produced by the normal stress on the crack face is considered, and K_I produced by the effective shear stress on the crack face is considered. A revised uniaxial compression damage model for rockmass considering the crack deformation parameter is proposed and the validity of the proposed model is verified with the experimental data. The results show that the prediction of the rockmass elastic modulus and damage under uniaxial compression with the proposed model is more accurate than those obtained with the existing models. Especially, when the crack dip angel is 0°, the rockmass elastic modulus obtained with the proposed model is 4.306 MPa, which is nearly equal to its tested value 4.310 MPa. The proposed model can perfectly describe the rockmass mechanical behavior under uniaxial compression, which also indicates that it is very necessary to consider the effect of the crack deformation parameter on the rockmass uniaxial compression mechanical property. This study can provide references for accurately predicting the rockmass mechanical behavior under uniaxial compression.
- rock mass with intermittent cracks /
- stress intensity factor /
- a uniaxial compression damage model /
- damage variable /
- crack deformation parameter

HTML全文

图 1 裂隙试件弹性模量及损伤随裂隙倾角变化规律

Figure 1. Variation of the sample elastic modulus and damage with the crack dip angle

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图 2 含单条中心斜裂隙的岩体

Figure 2. Rockmass with one central inclined crack

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图 3 裂隙面法向及切向位移曲线

Figure 3. Normal and shear displacement of the crack

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图 4 岩体单轴压缩弹性模量及损伤计算值与实测值对比

Figure 4. Comparison of the calculation results with the test ones of the rockmass elastic modulus and damage under uniaxial compression

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表 1 不同倾角时的试件裂隙变形参数k_n、k_s

Table 1. Crack deformation parameters k_n and k_s for the samples with different crack dip angles

α/（°） 0 15 30 45 60 75 90

k_n/（GPa∙m⁻¹） 1.95 1.85 1.55 1.3 1.0 0.1 /
k_s/（GPa∙m⁻¹） / 1.5 1.6 2.0 1.55 0.001 /

注：“/”表示可取任意值

下载: 导出CSV

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