非贯通裂隙岩体损伤演化率相关性及变形特征

邓正定; 向帅; 周尖荣; 王观石; 王月梅

doi:10.11883/bzycj-2018-0391

非贯通裂隙岩体损伤演化率相关性及变形特征

doi: 10.11883/bzycj-2018-0391

邓正定^{1, 2,},
向帅³,
周尖荣¹,
王观石^{1, 2},
王月梅⁴

1.
江西理工大学建筑与测绘工程学院，江西赣州 341000
2.
江西理工大学江西省环境岩土与工程灾害控制重点实验室，江西赣州 341000
3.
深圳勘察测绘研究院有限公司，广东深圳 518000
4.
江西理工大学应用科学学院，江西赣州 341000

基金项目: 国家自然科学基金（41462009，51768065）；江西省教育厅科学技术研究（GJJ170562，GJJ161571）

详细信息

作者简介:
邓正定（1987－　），男，博士，讲师，dengzhengding@126.com

中图分类号: O382.2
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出版历程
- 收稿日期: 2018-10-12
- 修回日期: 2019-02-21
- 刊出日期: 2019-08-01

Rate correlation and deformation of damage evolutionof non-penetrating fractured rock masses

1.
School of Architecture and Surveying Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
2.
Jiangxi Key Laboratory of Environmental Geotechnical and Engineering Disaster Control,Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
3.
Shenzhen Survey and Mapping Research Institute Co., Ltd., Shenzhen 518000, Guangdong, China
4.
College of Applied Science, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China

摘要

摘要: 含非贯通裂隙岩体是自然界中岩体的主要赋存形式，其裂隙几何特征对岩体的强度及变形均产生显著影响。应变率对岩体的损伤演化及黏滞效应也具有显著的率相关性。首先，运用模型元件的方法，将非贯通裂隙岩体动态破坏过程视为具复合损伤、静态弹性特性、动态黏滞特性的非均质点组成，对黏弹性响应的Maxwell体进行改进，将细观损伤体与裂隙损伤演化的宏观损伤体根据等效应变假设并联组成宏细观复合损伤体，构建综合考虑岩体宏细观缺陷的动态损伤模型；其次，基于断裂力学及应变能理论，对岩体宏观裂隙动态扩展的能量机制进行分析，综合考虑初始裂隙应变能、裂隙动态损伤演化过程应变能、裂隙闭合应变能，得到裂隙岩体宏观动态损伤变量计算公式；最后，将模型计算结果与实验结果进行比较，模型计算结果与实验结果吻合较好，证明了模型的合理性，同时利用模型讨论了裂隙倾角、应变率、岩石性质对岩体变形特征的影响规律。
- 非贯通 /
- 裂隙岩体 /
- 损伤演化 /
- 应变率 /
- 本构模型
Abstract: The non-penetrating fractured rock mass is the main form of rock mass in nature, and the geometric features of its fractures play a remarkable role in its strength and deformation. Its strain rate also has a significant rate dependence on its damage evolution and viscous effects. Firstly, using the model element method, we treated the dynamic failure process of non-penetrating fractured rock mass as a heterogeneous point with composite damage, static elastic properties and dynamic viscous properties, and improved the Maxwell body that responds to viscoelasticity. Then we combined the meso-damaged body and the macroscopic damage body of fracture damage evolutions into a macro-microscopic composite damage body following the equivalent strain hypothesis and constructed a dynamic damage model considering the macroscopic and microscopic defects of the rock mass. Furthermore, based on the fracture mechanics and strain energy theory, we analyzed the energy mechanism of the macroscopic fracture dynamic expansion of rock mass and obtained the calculation formula of the macroscopic dynamic damage variable of the fractured rock mass, with the initial fracture strain energy, the strain energy of the crack dynamic damage evolution process and the fracture closed strain energy, taken into consideration. Finally, we compared the results from the model calculation with those from experiment and found them in good agreement, thereby proving the rationality of the model. At the same time, we also discussed the influence of fracture inclination, strain rate and rock properties on rock mass deformation characteristics using the model.
- non-through /
- fractured rock mass /
- damage evolution /
- strain rate /
- constitutive model

HTML全文

图 1 黏弹性复合损伤动态模型

Figure 1. Dynamic model of viscoelastic composite damage

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图 2 裂隙扩展简化模型

Figure 2. Simplified model for crack propagation

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图 3 参量ε₀对本构关系的影响

Figure 3. Influence of parameters ε₀ on constitutive relation

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图 4 参量m对本构关系的影响

Figure 4. Influence of parameters m on constitutive relation

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图 5 参量η对本构关系的影响

Figure 5. Influence of parameters η on constitutive relation

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图 6 参量E_M对本构关系影响

Figure 6. Influence of parameters E_M on constitutive relation

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图 7 裂隙岩体的实验结果与理论计算结果比较

Figure 7. Comparison of experimental and theoretical results of fractured rock mass

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图 8 初始损伤变量随裂隙倾角的变化

Figure 8. Variation of initial damage with slit angle

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图 9 起裂强度随裂隙倾角的变化

Figure 9. Variation of fracture strength with slit angle

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图 10 不同裂隙贯通度的岩体动态应力应变曲线

Figure 10. Dynamic stress-strain curves of rock mass with different fracture penetrability

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图 11 应变率对翼裂纹扩展长度的影响

Figure 11. Influence of strain rate on length of wing crack

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图 12 应变率对岩体力学特性的影响

Figure 12. Influence of strain rateon mechanicalproperties of rock

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图 13 E₀对岩体动态力学特性的影响

Figure 13. Influence of E₀ on mechanical properties

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图 14 K_ⅠC对岩体动态力学特性的影响

Figure 14. Influence of K_ⅠC on mechanical properties

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