含非贯通节理花岗岩的力学特性与细观起裂机制研究

doi:10.13722/j.cnki.jrme.2022.0671

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摘要非贯通节理复杂的起裂机制与破坏模式对岩体力学行为有着重要的影响。考虑节理倾角与贯通度的影响，基于花岗岩试样单轴压缩试验，分析非贯通节理对岩体力学特性及断裂特征的影响，结合三维离散元数值模型，从细观尺度研究裂纹起裂、贯通破坏过程与岩体宏观破坏的相关性，并建立含非贯通节理的断裂力学理论模型，引入应力强度因子一般表达式，分析非贯通节理的断裂韧性，量化节理倾角与贯通度对岩体抗脆断能力的影响。结果表明：非贯通节理对岩体造成的劣化效应显著，随着倾角的增加，节理岩体强度增加。根据裂纹形态与形成机制，区分了6种裂纹，发现节理试样的起裂破坏模式对强度特征影响显著。15°～75°范围内，试样的断裂韧度随节理倾角的增大有不断增大的趋势，其中，15°节理试样抗脆断能力最弱；随节理贯通度的增大，节理岩体的断裂韧性近似双曲线趋势减小。

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	刘婷婷1
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	阳润超1
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	李新平1
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	曾乐乐1
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关键词 ：岩石力学, 节理岩体, 非贯通节理, 起裂机制, 断裂韧性

Abstract：The complex fracture initiation mechanism and failure mode of discontinuous joints are significant to the mechanical behavior of rock mass. Considering the effect of the joint angles and length，the influence of non-persistent joint on the mechanical properties and fracture characteristics of rock mass are analyzed with granite rock specimens under uniaxial loading. Then a three-dimensional discrete element model was established，and the failure mechanism and crack propagation were investigated from the meso-scale. Finally，a fracture mechanical model with a non-persistent joint is established to analyze the fracture toughness，and the influence of joint inclination and penetration on the brittle fracture resistance of rock mass is quantified. The results show that：the degradation effect of initial damage on rock mass is obvious. Six kinds of cracks are distinguished according to the experimental results and the crack initiation failure mode of joint samples has a significant influence on the strength characteristics. The fracture toughness of the specimen increases with the increase of joint inclination at the range of 15°‐75°，and the brittle fracture resistance of the specimen with 15° joint is the weakest. With the increase of joint persistency，the fracture toughness of jointed rock mass decreases in an approximate hyperbolic trend.

Key words： rock mechanics rock mechanics non-persistent joint fracture mechanics model fracture toughness

引用本文:

刘婷婷1，2，阳润超1，丁鹿阳1，李新平1，2，曾乐乐1，2. 含非贯通节理花岗岩的力学特性与细观起裂机制研究[J]. 岩石力学与工程学报, 2023, 42(5): 1070-1082.
LIU Tingting1，2，YANG Runchao1，DING Luyang1，LI Xinping1，2，ZENG Lele1，2. Study on mechanical properties and meso-initiation mechanism#br# of granite with non-persistent joints. , 2023, 42(5): 1070-1082.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0671 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I5/1070

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