理论与试验研究

考虑裂隙贯穿度的岩石裂纹演化及声发射特性

  • 张嘉凡 ,
  • 车虎斌 ,
  • 张慧梅 ,
  • 袁超 ,
  • 刘小宇
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  • 1.西安科技大学 理学院,西安 710054;
    2.西安科技大学 建筑与土木工程学院,西安 710054
张嘉凡(1967—),男,西安人,博士,教授,主要从事岩土工程、地下工程等领域的教学与科研工作。E-mail:zhangjiafan_339@163.com
张慧梅(1968—),女,山西大同人,博士,教授,主要从事岩土工程、地下工程等领域的研究工作。E-mail:zhanghmktz@xust.edu.cn

收稿日期: 2024-08-25

  网络出版日期: 2025-06-13

基金资助

陕西省自然科学基金(2020JZ-53);国家自然科学基金(12172280)

Rock Crack Evolution and Acoustic Emission Characteristics Considering Crack Penetration Based on PFC

  • Zhang Jiafan ,
  • Che Hubin ,
  • Zhang Huimei ,
  • Yuan Chao ,
  • Liu Xiaoyu
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  • 1. College of Science, Xi'an University of Science and Technology, Xi' an 710054, P.R. China;
    2. College of Architecture and Civil Engineering, Xi' an University of Science and Technology, Xi' an 710054, P.R. China

Received date: 2024-08-25

  Online published: 2025-06-13

摘要

不同裂隙贯穿度在岩体中广泛存在,但目前对贯穿度的研究较为罕见。为研究此类岩体的变形破坏行为,对裂隙贯穿度P=0%、25%、50%、75%、100%的红砂岩进行三轴压缩试验,并开展了PFC数值模拟研究。结果表明:裂隙贯通度越大,岩样强度越小,应力-应变曲线塑性变形段越明显;对于完整岩样,围压会改变岩样的破坏模式,由拉伸破坏向剪切破坏转化。对于裂隙岩样,贯穿度越大,岩样破坏时裂纹越复杂;同一裂隙岩样在不同围压下,破坏时裂纹有所区别,但总体破坏类型不变;PFC3D显示完整岩样破坏时,张拉裂纹首先出现在加载点处,而裂隙岩样首先出现在加载点及预制裂隙处;声发射振铃计数有平稳期、缓增期和激增期;岩样在应变软化阶段才会出现宏观破坏。本文成果可为工程中研究岩体破裂演化规律提供依据。

本文引用格式

张嘉凡 , 车虎斌 , 张慧梅 , 袁超 , 刘小宇 . 考虑裂隙贯穿度的岩石裂纹演化及声发射特性[J]. 地下空间与工程学报, 2025 , 21(3) : 845 -853 . DOI: 10.20174/j.JUSE.2025.03.12

Abstract

Different fracture penetrations exist widely in rock mass, but the research on penetration is rare at present. In order to study the deformation and failure behavior of rock mass with different fracture penetrations, triaxial compression tests were carried out on red sandstone with fracture penetrations of P=0%, 25%, 50%, 75%, and 100%, and PFC numerical simulation was conducted. The results show that: The greater the degree of fracture penetration, the smaller the strength of the rock sample, and the more obvious the plastic deformation section of the stress-strain curve. For intact rock samples, confining pressure will change the failure mode of rock samples, from tensile failure to shear failure. For fractured rock samples, the greater the penetration, the more complex the crack when the rock sample is destroyed. Under different confining pressures, the cracks of the same fractured rock sample are different when they are destroyed, but the overall failure type is unchanged. PFC3D shows that when the complete rock sample is destroyed, the tensile crack first appears at the loading point, while the fractured rock sample first appears at the loading point and the prefabricated crack. Acoustic emission ringing count has a stationary period, a slow increase period, and a surge period. The macroscopic failure of the rock sample will occur in the strain-softening stage. The results in this paper can provide a basis for studying the fracture evolution law of rock mass in engineering.

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