玄武岩节理系数及其与强度和变形特性的关系研究

孔洋; 阮怀宁; 张桂荣; 何宁; 汪璋淳

doi:10.11779/CJGE2024S10008

玄武岩节理系数及其与强度和变形特性的关系研究 English Version

1.
南京水利科学研究院岩土工程研究所, 江苏南京 210024
2.
河海大学岩土工程研究所, 江苏南京 210024

基金项目:

国家自然科学基金长江水科学研究联合基金项目 U2240221

国家自然科学基金重点项目 41831278

中央级公益性科研院所基本科研业务费专项资金项目 Y321003

详细信息

作者简介:
孔洋(1989—)，男，山东宁阳人，博士，高级工程师，主要从事节理岩体力学特性与岩土工程安全监测等方面的科研工作。E-mail: ykong@nhri.cn

中图分类号: TU452;TU458
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出版历程
- 收稿日期: 2024-04-30
- 刊出日期: 2024-07-31

Joint factor of basalt and its relationship with strength and deformation characteristics

1.
Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China
2.
Institute of Geotechnical Research, Hohai University, Nanjing 210024, China

摘要

摘要: 节理密度、节理倾角与节理粗糙度情况等是控制玄武岩力学响应的三个关键因素。基于3D打印技术，通过开展单轴压缩与界面剪切试验，针对不同的模拟柱状节理玄武岩试样的破坏模式深入探究了特殊柱状节理的存在对玄武岩强度与变形的弱化作用，分析了节理系数与试样各向异性效应的关系。研究结果表明随节理系数的增大，模拟柱状节理玄武岩试样强度折减系数的线性减小程度及模量折减系数以指数关系式降低幅度受失效模式影响显著；强度各向异性效应与模量各向异性效应数值越大，表明柱状节理对玄武岩的岩块弱化作用越强；不同失效模式工况下，随节理系数的增加，强度各向异性效应线性增大，模量各向异性效应以指数关系式升高。研究成果可为工程岩体各向异性力学响应分析提供一定的技术支撑。
- 玄武岩 /
- 节理系数 /
- 弱化效应 /
- 强度 /
- 变形 /
- 各向异性
Abstract: The joint density, joint inclination angle and joint roughness are the three key factors that control the mechanical response of basalts. Based on the 3D printing technology, the uniaxial compression and interfacial shear tests are carried out to deeply explore the weakening effects of the existence of special columnar joints on the strength and deformation of the basalts according to the failure modes of different columnar jointed basalt samples, and the relationship between the joint factor and the anisotropy effects of samples is analyzed. The research results show that with the increase of the joint factor, the linear reduction degree of the strength reduction coefficient and the exponential relation reduction degree of the modulus reduction coefficient of the simulated columnar jointed basalt samples are significantly affected by the failure mode. The larger the values of the strength anisotropy effects and modulus anisotropy effects, the stronger the weakening effects of columnar joints on basalt blocks. Under different failure modes, the strength anisotropy effects increases linearly with the increase of the joint factor, and the modulus anisotropy effects increase exponentially. The research results can provide some technical support for the anisotropic mechanical response analysis of engineering rock masses.
- basalt /
- joint coefficient /
- weakening effect /
- strength /
- deformation /
- anisotropy

HTML全文

图 1 不同柱体倾斜角度的节理网络三维模型示意图

Figure 1. Schematic diagram of three-dimensional model for columnar joint network with different inclination angles

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图 2 模拟柱状节理玄武岩试样与界面剪切试验试样示意图

Figure 2. Schematic diagram of columnar jointed basalt samples and interfacial shear test samples

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图 3 典型轴向应力-应变曲线

Figure 3. Typical axial stress-strain curves

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图 4 强度、模量折减系数各向异性曲线

Figure 4. Anisotropy curves of reduction coefficient of strength and modulus

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图 5 强度折减系数、模量折减系数与节理系数的关系曲线

Figure 5. Relationship curves between reduction coefficients of strength and modulus and joint factor

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图 6 强度各向异性效应、模量各向异性效应与节理系数关系曲线

Figure 6. Relationship curves between strength and modulus anisotropy effects and joint factor

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表 1 不同柱体倾斜角度的模拟柱状节理玄武岩试样节理系数计算结果

Table 1 Calculated results of joint factor for simulated columnar jointed basalt samples with different inclination angles

β/ (°)	100 mm	J_n/m^-1		n			r	J_f/m^-1
β/ (°)	100 mm	等效为1 m	本文	U型	肩型	本文	r	等效	本文
0	—	—	—	0.82	0.85	2.04	0.715	—	—
15	4	40	31	0.29	0.40	0.39	0.715	142.77	111.96
30	6	60	61	0.05	0.06	0.33	0.715	256.23	258.81
45	8	80	86	0.20	0.29	0.33	0.715	340.48	364.77
60	10	100	105	0.46	0.80	0.57	0.715	243.87	255.98
75	12	120	117	0.73	0.93	1.21	0.715	139.14	135.75
90	12	120	121	0.95	0.98	1.00	0.715	167.83	169.52

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参考文献(13)

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