理论与试验研究

裂隙砂岩动静组合SHPB力学性能试验研究

  • 平琦 ,
  • 徐一杰 ,
  • 李向阳 ,
  • 吴世伟 ,
  • 胡静
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  • 1.安徽理工大学 深部煤炭安全开采与环境保护全国重点实验室,安徽 淮南 232001;
    2.安徽理工大学 矿山地下工程教育部工程研究中心,安徽 淮南 232001;
    3.安徽理工大学 土木建筑学院,安徽 淮南 232001
平琦 (1975—),男,安徽淮南人,博士,教授、博士生导师,主要从事岩石动力学和地下空间科学与工程等教学与研究工作。E-mail: ahpingqi@163.com

收稿日期: 2024-10-11

  网络出版日期: 2025-09-03

基金资助

国家自然科学基金(52074005,52074006);安徽省自然科学基金(1808085ME134)

Dynamic and Static Combined SHPB Experimental Study on the Mechanical Properties of Fractured Sandstone

  • Ping Qi ,
  • Xu Yijie ,
  • Li Xiangyang ,
  • Wu Shiwei ,
  • Hu Jing
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  • 1. State Key Laboratory for Safe Mining of Deep Coal Resources and Environmental Protection, Anhui University of Science and Technology, Huainan, Anhui 232001, P. R. China;
    2. Engineering Research Center of Mine Underground Projects, Ministry of Education, Anhui University Science of Technology, Huainan, Anhui 232001, P. R. China;
    3. School of Civil Engineering and Architecture, Anhui University Science of Technology, Huainan, Anhui 232001, P. R. China

Received date: 2024-10-11

  Online published: 2025-09-03

摘要

为研究动静组合加载条件下裂隙倾角对砂岩动态力学特性的影响规律,利用动静组合SHPB试验装置对倾角为0°、15°、30°、45°、60°、75°、90°的预制裂隙砂岩试件进行冲击压缩试验。结果表明:动静组合加载条件下不同倾角预制裂隙砂岩试件动应力—应变曲线簇均位于完整砂岩试件曲线下方;随裂隙倾角增大,试件动抗压强度、动应变、动弹性模量和试件破碎平均粒径均呈先减小后增大,裂隙倾角45°时为拐点;裂隙倾角0°时,试件沿加载方向呈张拉破坏,15°~60°时为张拉—剪切复合破坏,75°~90°时为剪切破坏,45°时试件破碎程度最大,0°时试件破碎程度最小。

本文引用格式

平琦 , 徐一杰 , 李向阳 , 吴世伟 , 胡静 . 裂隙砂岩动静组合SHPB力学性能试验研究[J]. 地下空间与工程学报, 2025 , 21(4) : 1194 -1201 . DOI: 10.20174/j.JUSE.2025.04.10

Abstract

To study the influence of fracture inclination angle on the dynamic mechanical properties of sandstone under dynamic and static combined loading conditions, impact compression tests were conducted on prefabricated fractured sandstone specimens with inclination angles of 0°, 15°, 30°, 45°, 60°, 75°, and 90° using dynamic and static combined SHPB test device. The results show that: Under dynamic and static combined loading conditions, the dynamic stress-strain curves of prefabricated fractured sandstone specimens with different inclination angles are located below the complete sandstone specimen curve. As the inclination angle of fracture increases, the dynamic compressive strength, dynamic strain, dynamic elastic modulus, and average particle size of fragments all show a variation of first decreasing and then increasing, and the inflection point is located at fracture inclination angle of 45°. When the fracture inclination angle is 0°, the failure mode of the specimen is tensile failure along the loading direction, while failure mode is tensile-shear composite failure for fracture inclination angle of 15°~60° and shear failure for fracture inclination angle of 75°~90°. Moreover, the fragmentation degree of the specimen is largest at fracture inclination angle of 45° and is smallest at 0°.

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