节理岩体代表性单元体积与剪切方向性研究

doi:10.16265/j.cnki.issn1003-3033.2025.S2.0010

中国安全科学学报 ›› 2025, Vol. 35 ›› Issue (S2): 175-181.doi: 10.16265/j.cnki.issn1003-3033.2025.S2.0010

节理岩体代表性单元体积与剪切方向性研究

秦泽龙¹^,²(), 张超², 崔银祥²^,^**(), 郭永成¹, 李启阳¹^,², 胡瑾³

¹ 三峡大学土木与建筑学院, 湖北宜昌 443002
² 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室, 湖北武汉 430071
³ 中冶武勘工程技术有限公司, 湖北武汉 430080

收稿日期:2025-07-01 出版日期:2026-02-04
通信作者:
**崔银祥(1976—),男,山西忻州人,博士,副研究员,主要从事矿山边坡方面的研究工作。E-mail:yxcui@whrsm.ac.cn。
作者简介:
秦泽龙 (2000—),男,山西吕梁人,硕士,主要从事矿山边坡方面的工作。E-mail:13294089014@163.com。
张超研究员
崔银祥副研究员
郭永成副教授
胡瑾正高级工程师
基金资助:
应急管理部重点科技计划2024年度项目(2024EMST080802); 中国煤科集团重点项目(2022-ZD002)

Representative element volume and shear anisotropy in jointed rock masses

QIN Zelong¹^,²(), ZHANG Chao², CUI Yinxiang²^,^**(), GUO Yongcheng¹, LI Qiyang¹^,², HU Jin³

¹ College of Civil Engineering & Architecture, China Three Gorges University, Yichang Hubei 443002, China
² State Key Laboratory of Geomechanics and Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan Hubei 430071, China
³ WSGRI Engineering & Surveying Incorporation Limited, Wuhan Hubei 430080, China

Received:2025-07-01 Published:2026-02-04

摘要/Abstract

摘要：

为准确刻画节理岩体因空间非均匀分布导致的参数变异性,以西非某矿区典型铁英岩岩体为对象,通过整合节理产状数据,经空间聚类分析识别优势节理组,结合室内试验标定岩石与节理参数,基于3DEC平台构建节理岩体三维离散等效模型;通过联合分析单轴压缩模拟与力学参数变异系数,确定岩体代表性单元体积,开展不同剪切方向下的直剪数值试验。结果表明:节理空间构型显著影响岩体应力强度,法向应力从3、 5、10 MPa依次递增,X向剪应力增加56%、90%时,Y向剪应力增加48%、102%;在3、5、10 MPa法向应力下,Y向剪应力比X向剪应力增加32%、14%、20%;剪切过程中位移场呈现多向非均匀演化特征,剪应力方向为优势变形主导向,变形优先发生在与水平剪切应力夹角较小的中低倾角或近水平节理面。

关键词: 节理岩体, 代表性单元体积(REV), 变异系数, 剪切强度, 剪切变形

Abstract:

To accurately capture the parameter variability induced by the spatial heterogeneity of jointed rock masses, a typical itabirite rock mass in a West African mine was investigated. By combining joint orientation data, spatial cluster analysis was conducted for identifying dominant joint sets, and laboratory tests for parameter calibration were performed to build a 3DEC-based discrete equivalent model. Through a combined analysis of uniaxial compression simulations and the coefficient of variation of mechanical parameters, the REV of the rock mass was determined. Based on this, direct shear numerical experiments were conducted under different shear directions. The results indicate that the spatial configuration of joints significantly influences the rock mass's shear strength. As the normal stress increases from 3 MPa to 5 MPa and then 10 MPa, the shear stress in the X-direction increases by 56% and 90%, while the shear stress in the Y-direction increases by 48% and 102%. Under normal stresses of 3, 5, and 10 MPa, the shear stress in the Y-direction is 32%, 14%, and 20% higher than that in the X-direction, respectively. During the shearing process, the displacement field exhibits multi-directional and non-uniform evolutionary characteristics, with the shear stress direction serving as the dominant orientation of deformation.

Key words: jointed rock mass, representative elementary volume (REV), coefficient of variation, shear strength, shear deformation

中图分类号:

X936

秦泽龙, 张超, 崔银祥, 郭永成, 李启阳, 胡瑾. 节理岩体代表性单元体积与剪切方向性研究[J]. 中国安全科学学报, 2025, 35(S2): 175-181.

QIN Zelong, ZHANG Chao, CUI Yinxiang, GUO Yongcheng, LI Qiyang, HU Jin. Representative element volume and shear anisotropy in jointed rock masses[J]. China Safety Science Journal, 2025, 35(S2): 175-181.

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参考文献 18

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节理组	平均倾角/(°)	平均倾向	Fisher常数
1	74	256	29.27
2	45	180	8.16
3	37	53	8.67

节理参数	节理组1	节理组2	节理组3
峰值黏聚力/MPa	1.26	1.32	1.58
峰值内摩擦角/(°)	26.3	27.70	32.2
残余内摩擦角/(°)	24.35	24.07	24.47
法向刚度/(GPa·m^-1)	15.35	12.82	16.72
切向刚度/(GPa·m^-1)	10.82	10.69	10.25

节理岩体代表性单元体积与剪切方向性研究

Representative element volume and shear anisotropy in jointed rock masses

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