Penetration performance of concrete under triaxial stress
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摘要: 研制了三轴应力状态作用下混凝土侵彻实验装置。该装置采用液压伺服控制系统对立方体试件施加三向独立的静载、采用高压气体驱动子弹侵彻混凝土试件；试件六个面的动态压缩信号和侧面摩擦信号可由六根杆上的应变片记录。以混凝土试件为例，对立方体试件施加三向独立的0～100 MPa真三轴静载，研究其在不同应力状态下的侵彻性能，得到了立方体试件在无侧限、单向侧限、双向侧限下的侵彻差异，揭示出应力状态对侵彻性能的影响。Abstract: In this study we developed a hydraulic servo control system for experimental study on concrete penetration under triaxial stress for independently-controlled triaxial confinement on cubic specimens, and launched bullets to penetrate concrete specimens with high pressure, using the strain gauges to record the dynamic compression signals and side friction signals on the six bars of six surfaces of the specimens. Taking the concrete specimens as an example, we investigated the cubic specimens’ penetration performance under different stress states based on the independently-controlled triaxial confinement of 0-100 MPa, and obtained their penetration differences under unilateral, unilateral and bidirectional lateral confinements, revealing the effect of the stress state on penetration performance.
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Key words:
- triaxial stress state /
- penetration /
- concrete /
- loading path
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图 1 三轴应力状态下混凝土侵彻实验系统
Figure 1. Penetration system for concrete specimen under true tri-axial confinement
图 3 试件在静载[0 MPa, 0 MPa, 0 MPa]、冲击速度53.8 m/s下六根杆上的典型信号
Figure 3. Recorded wave profiles in six bars under [0 MPa, 0 MPa, 0 MPa] triaxial static load and impact velocity 53.8 m/s
图 4 试件在静载[0 MPa, 0 MPa, 0 MPa]三种接触条件、冲击速度约50 m/s下的应力分析
Figure 4. Stress analyses of specimen under three contact conditions at triaxial static load [0 MPa, 0 MPa, 0 MPa] and impact velocity 50 m/s
图 5 试件在冲击速度约190 m/s、四种静载下的应力分析
Figure 5. Stress analyses of specimen under impact velocity 190 m/s and four triaxial confinement
图 6 冲击速度对试件侧面摩擦阻力的影响
Figure 6. Effect of static confinement on frictional resistance of specimen
图 7 静载条件和冲击速度对试件侵彻阻力的影响
Figure 7. Effects of static confinement and impact velocity on penetration resistance of specimen
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