工程力学 ›› 2020, Vol. 37 ›› Issue (3): 188-201.doi: 10.6052/j.issn.1000-4750.2019.04.0232

• 土木工程学科 • 上一篇    下一篇

共面双裂隙类岩石材料抗拉强度试验研究

董晋鹏1, 杨圣奇1,2, 李斌1, 黄彦华2   

  1. 1. 中国矿业大学深部岩土力学与地下工程国家重点实验室, 江苏, 徐州 221116;
    2. 中国矿业大学力学与土木工程学院, 江苏, 徐州 221116
  • 收稿日期:2019-04-28 修回日期:2019-08-28 出版日期:2020-03-25 发布日期:2019-10-12
  • 通讯作者: 杨圣奇(1978-),男,江苏人,教授,博士,博导,主要从事深部岩石力学与地下工程研究(E-mail:yangsqi@hotmail.com). E-mail:yangsqi@hotmail.com
  • 作者简介:董晋鹏(1994-),男,山西人,硕士生,主要从事岩石力学与地下工程研究(E-mail:jepsoncumt@163.com);李斌(1991-),男,陕西人,硕士生,主要从事节理裂隙岩石力学特性研究(E-mail:bin@cumt.edu.cn);黄彦华(1989-),男,福建人,博士后,主要从事断续裂隙岩石力学试验与模拟研究(E-mail:huangyh1219@163.com).
  • 基金资助:
    江苏省六大人才高峰资助项目(JNHB-090);中国博士后科学基金项目(2018M642360)

EXPERIMENTAL STUDY ON THE TENSILE STRENGTH OF ROCK-LIKE MATERIALS CONTAINING TWO PRE-EXISTING COPLANAR FISSURES

DONG Jin-peng1, YANG Sheng-qi1,2, LI Bin1, HUANG Yan-hua2   

  1. 1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;
    2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
  • Received:2019-04-28 Revised:2019-08-28 Online:2020-03-25 Published:2019-10-12

摘要: 研究裂隙充填下岩石的力学特性对确保裂隙岩体的稳定性具有重要意义。该文首先配制了不同裂隙倾角下充填与非充填共面双裂隙巴西圆盘类岩石试样,然后在DNS 300岩石伺服机上进行巴西劈裂试验。基于试验结果,分析了裂隙倾角及裂隙充填与否对试样抗拉强度的影响,并结合其声发射特征和数字散斑系统对试样的裂纹扩展过程进行分析。结果表明:相比非充填试样,裂隙充填一定程度上增加了试样的完整性,使其抗拉强度有所增加;无论试样裂隙充填与否,其抗拉强度都受裂隙倾角的影响,随着裂隙倾角的增加,充填与非充填试样的抗拉强度逐渐呈现下降趋势;裂隙倾角在15°以内和为90°时,裂隙充填与否对试样的破裂模式基本没有影响;而裂隙倾角介于30°和75°之间时对其破裂模式影响较大,且随着裂隙倾角的增加,在形态上充填与非充填试样的破裂模式都由拉张裂纹向翼裂纹转变。

关键词: 抗拉强度, 充填裂隙, 声发射, 裂纹扩展, 破裂模式, 数字散斑

Abstract: It is of great importance to study the mechanical properties of rock containing filling fissures to ensure the stability of fractured rock mass. The filling and non-filling coplanar double-fissures Brazilian disc rock-like samples with different fissure angles are prepared and the Brazilian splitting tests were performed on a DNS 300 rock servo machine. Based on the test results, the influence of crack inclination and crack filling on the tensile strength of the specimens was analyzed. The crack propagation process was also analyzed based on its acoustic emission characteristics and a digital speckle system. The main conclusions are drawn as follows:Compared with non-filling samples, the crack filling increases the integrity of the sample to some extent and increases its tensile strength; regardless of whether the cracks of the sample are filled or not, the tensile strength is affected by the crack inclination. With the increase of the crack inclination, the tensile strength of the filled and non-filled specimens shows an downward trend gradually; the crack filling has little effect on the failure mode of the sample when the crack inclination angle α ≤ 15° and α=90°, but it has a great influence on the failure mode when 30° ≤ α ≤ 75°. As α increases, the failure modes of both filled and non-filled specimens change from tensile cracks to wing cracks in morphology.

Key words: tensile strength, filling fissures, acoustic emission, crack propagation, failure mode, digital speckles

中图分类号: 

  • TU45
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