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为研究动态冲击作用下含不同角度裂隙的混凝土裂纹扩展机理，利用分离式霍普金森压杆试验系统进行不同裂隙角度的动态冲击试验，采用数字图像相关系统进行表面应变监测，对比分析了动力冲击后不同裂隙角度试样的动态强度、能量耗散以及破碎分形特征，并基于断裂力学给出裂隙周边应力的理论结果。结果表明：随着裂隙角度的增加，峰值应力应变表现出典型的V形变化，均在30°达到最小值，其初始损伤区由裂隙尖端向裂隙中部移动，随后损伤范围逐渐扩大直至形成宏观破坏，其破坏形式也分别表现为拉伸破坏(0°)、剪切破坏(30°)、拉剪混合破坏(45°和60°)，以及压塌破坏(90°)。试样的耗散能随着裂隙角度的增加先增大后减小，在30°达到最大值，表征了试样中能量积累和转化的过程。随着试样裂隙角度的增加，试样破碎分形值先增大后减小，整体分布在1.5～2.2，并在30°时取得最大值，说明此时试样耗散能量相对较大，从而导致试样破碎程度更高。结合断裂力学给出了裂隙周边的应力解析解，从理论上解释了不同裂隙角度下起裂角、应力分布以及能量耗散的变化规律，与试验结果吻合较好。
Abstract：Introduction As the depth of resource exploitation in our country increases, power shock disasters occur frequently in underground engineering, which will severely restrict the rapid development of the economy. In the process of strengthening the foundation with fly ash concrete, the strengthened body not only bears static loads but also dynamic loads, forming initial defects such as joints and cracks inside. The development, extension, and penetration of cracks under dynamic loads will further reduce the stability of the strengthened structure. Therefore, it is urgent to deeply study the mechanical properties of fly ash concrete with cracks under dynamic loads. Methods Dynamic impact tests were carried out with the split Hopkinson pressure bar(SHPB) test system on the samples with different fracture angles. Digital image correlation system(DIC) was used to monitor the deformation of surface strain. Characteristics of the samples with different fracture angles after dynamic impact were compared and analyzed including the dynamic strength, energy dissipation and fractal fracture. Results and discussion The results show that with the increase of the crack angle, the peak stress-strain presents a typical V-shaped pattern, reaching the minimum value at 30°. With the increase of fracture angle, the initial damage zone also moved from the fracture tip to the middle of the fracture, and then the damage range gradually expanded until the formation of macro failure. The failure modes are tensile failure(0°), shear failure(30°), tension-shear mixed failure(45° and 60°) and collapse failure(90°), respectively. The dissipated energy of the sample firstly increase and then decrease with the increase of the fracture angle, reaching the maximum value at 30°. The process of energy accumulation and transformation in fractured rock mass is characterized by the strain energy density. With the increase of the crack angle of the sample, the fractal value of the sample first increases and then decreases, and reaches a maximum value at 30°, indicating that a higher degree of sample breakage associated with dissipates relatively large energy. Based on fracture mechanics, the analytical solution of stress around the crack is given, and the variation of crack initiation angle, stress distribution and energy dissipation under different crack angles is theoretically explained, which is in good agreement with the experimental measurements. Conclusions This paper uses the SHPB and DIC systems to conduct dynamic impact tests on specimens with cracks at different angles, and compares and analyzes the dynamic strength, energy dissipation, and fracture fractal characteristics of specimens with different crack angles after dynamic impact, and gives the theoretical results of the stress around the crack. To provide some theoretical support for the deformation control of cracked concrete mixed with fly ash under dynamic action.
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基本信息:
DOI：10.14062/j.issn.0454-5648.20250264
中图分类号:TU528
引用信息:
[1]吉东亮,文志杰,左宇军,等.动载作用下含不同角度裂隙混凝土的损伤效应[J].硅酸盐学报,2025,53(11):3273-3281.DOI:10.14062/j.issn.0454-5648.20250264.
基金信息:
国家自然科学基金资助项目(No.52272439,No.U22A20233); 河北省教育厅青年基金(50199990574); 煤炭开采水资源保护与利用国家重点实验室年开放基金(NICE_RD_2025_111); 国铁重大项目(K2020G034)
2025-09-23
2025-09-23
2025-09-23