不同倾斜界面的高强砂浆–花岗岩试件动态裂纹扩展行为研究

doi:10.3724/1000-6915.jrme.2025.0512

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摘要高强砂浆因其高强度、高耐久性和优异的黏结性能，被广泛应用于裂隙岩体加固。在动态载荷作用下，高强砂浆–岩石组合体中的裂纹扩展行为复杂，既可沿界面扩展，也常出现穿透界面扩展的现象。目前针对静态界面断裂的研究较多，而动态载荷下穿透扩展机制的研究相对缺乏。为此，以花岗岩为加固对象，将其与高强砂浆组合制成侧开单裂纹三角形板（SMCT）试件，采用改进的分离式霍普金森压杆系统（SHPB）进行冲击试验。试验中采用红外测速仪测量冲击速度，并通过应变片与超动态应变仪采集波形数据。结合试验–数值方法与裂纹扩展计（CPG），系统研究界面倾角、粗糙度及砂浆强度对裂纹扩展参数、动态断裂韧度和断裂能的影响。利用ABAQUS软件建立数值模型，批量嵌入零厚度二维四节点黏聚力单元（COH2D4）以模拟裂纹随机扩展；通过试验数据获取裂纹扩展速度与时间，结合普适函数计算动态应力强度因子与动态断裂韧度。结果表明：当界面倾角由90°增至106°时，砂浆与花岗岩区域的平均断裂韧度分别提高19%和23%，平均断裂能分别提升38%和56%；砂浆抗压强度从80 MPa提高至100 MPa时，试件平均起裂韧度增加了32%；粗糙度对穿透裂纹扩展速度、动态断裂韧度及断裂能的影响不显著。数值模拟显示，在冲击载荷下裂纹尖端拉应力远大于剪应力，剪应力近乎为0，SMCT试件始终呈现I型断裂特征。

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	邱豪1
	张文康1
	廖飞宇1
	刘杰2
	周磊3
	郑居焕4*

关键词 ：岩石力学, 高强砂浆, 界面倾角, 动态断裂韧度, 数值模拟, 断裂能

Abstract：High-strength mortar is widely employed in the reinforcement of fractured rock masses due to its exceptional strength, durability, and bonding performance. Under dynamic loading, the crack propagation behavior in high-strength mortar–rock composites is complex, with potential for cracks to extend along the interface or penetrate through it. While considerable research has focused on static interfacial fractures, the mechanisms driving penetration propagation under dynamic loading remain relatively underexplored. To address this gap, granite was chosen as the reinforcement target and combined with high-strength mortar to create side-cracked triangular plate (SMCT) specimens. Impact tests were conducted using a modified split Hopkinson pressure bar (SHPB) system. During the tests, an infrared velocimeter measured the impact velocity, while strain gauges and a super-dynamic strain gauge were utilized to collect waveform data. By integrating experimental and numerical methods alongside crack propagation gauges (CPGs), the effects of interface inclination, roughness, and mortar strength on crack propagation parameters, dynamic fracture toughness, and fracture energy were systematically investigated. A numerical model was developed using ABAQUS software, incorporating embedded zero-thickness two-dimensional four-node cohesive elements (COH2D4) to simulate random crack propagation. Crack propagation velocity and time were derived from experimental data, and the dynamic stress intensity factor and dynamic fracture toughness were calculated using a universal function. The results indicate that as the interface inclination increases from 90° to 106°, the average fracture toughness in the mortar and granite regions rises by 19% and 23%, respectively, while the average fracture energy increases by 38% and 56%, respectively. Moreover, when the compressive strength of the mortar increases from 80 MPa to 100 MPa, the average initiation toughness of the specimen improves by 32%. Roughness does not significantly affect penetration crack propagation velocity, dynamic fracture toughness, or fracture energy. Numerical simulations reveal that under impact loading, the tensile stress at the crack tip is significantly greater than the shear stress, which approaches zero, indicating that the SMCT specimens consistently exhibit mode I fracture characteristics.

Key words： rock mechanics high-strength mortar interface inclination angle dynamic fracture toughness numerical simulation fracture energy

引用本文:

邱豪1，张文康1，廖飞宇1，刘杰2，周磊3，郑居焕4* . 不同倾斜界面的高强砂浆–花岗岩试件动态裂纹扩展行为研究[J]. 岩石力学与工程学报, 2026, 45(1): 79-98.
QIU Hao1, ZHANG Wenkang1, LIAO Feiyu1, LIU Jie2, ZHOU Lei3, ZHENG Juhuan4*.

Dynamic crack propagation behavior of high-strength mortar-granite specimens with different inclined interfaces

. , 2026, 45(1): 79-98.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2025.0512 或 https://rockmech.whrsm.ac.cn/CN/Y2026/V45/I1/79

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