Effects of fissure locations on the crack propagation morphologies of 3D printing tunnel models: Experiments and numerical simulations

IF 5 2区 工程技术 Q1 ENGINEERING, MECHANICAL
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Abstract

Hidden fissures widely exist in the surrounding rock of tunnels, and the propagations and interactions of the fissures will directly affect the safety and stability of tunnels. However, experimental and numerical simulation studies are scarce on the tunnel-fissure interactions under complex stress conditions. Based on this background, circular tunnel specimens with different prefabricated fissure locations are prepared by three-dimensional (3D) printing technology. Uniaxial compression fracture tests are conducted utilizing Digital Image Correlation (DIC) technology to obtain strain distributions. An improved Smoothed Particle Hydrodynamics (SPH) method is employed to simulate the crack propagation processes of the tunnel-fissure interactions. The results demonstrate the following: 1) Upper main cracks, upper side cracks, and lower side cracks are produced around the tunnel, and wing cracks initiate from the prefabricated fissure tips. 2) For the different intersection positions, wing crack propagation length decreases as the intersection position moves upward, while the lower side crack propagation length increases. 3) For different distances d, upper side crack does not appear, and the propagation length of upper main crack increases with the increase of the distance d. 4) For different fissure inclination angles α, upper main crack does not appear when α = 15°. The propagation length of wing crack increases with the increase of inclination angle α. 5) The peak stress increases as the intersection position moves upward, while it decreases with the increase of inclination angle α. With increasing distance d, the peak stress initially increases and then decreases. Finally, the crack initiation mechanisms under different fissure orientations and inclinations are discussed. These research findings provide valuable insights into the tunnel-fissure interaction mechanisms under complex stress conditions and the applications of the SPH method in underground engineering simulations.

裂缝位置对 3D 打印隧道模型裂缝扩展形态的影响:实验和数值模拟
隧道围岩中广泛存在隐蔽裂隙,裂隙的扩展和相互作用将直接影响隧道的安全和稳定。然而,关于复杂应力条件下隧道与裂隙相互作用的实验和数值模拟研究却很少。在此背景下,利用三维打印技术制备了预制裂缝位置不同的圆形隧道试件。利用数字图像相关(DIC)技术进行单轴压缩断裂试验,以获得应变分布。采用改进的平滑粒子流体力学(SPH)方法模拟隧道-裂缝相互作用的裂纹扩展过程。结果表明1) 隧道周围产生了上部主裂缝、上部侧裂缝和下部侧裂缝,翼裂缝从预制裂缝尖端开始。2) 对于不同的交叉位置,翼裂缝扩展长度随着交叉位置的上移而减小,而下侧裂缝扩展长度则增加。3) 对于不同的距离 d,上侧裂缝不出现,上主裂缝的扩展长度随距离 d 的增大而增大 4) 对于不同的裂缝倾角 α,当 α = 15° 时,上主裂缝不出现。5) 峰值应力随交点位置的上移而增大,随倾角 α 的增大而减小。最后,讨论了不同裂缝方向和倾角下的裂缝萌发机制。这些研究成果对复杂应力条件下隧道与裂隙的相互作用机制以及 SPH 方法在地下工程模拟中的应用提供了宝贵的见解。
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来源期刊
Theoretical and Applied Fracture Mechanics
Theoretical and Applied Fracture Mechanics 工程技术-工程:机械
CiteScore
8.40
自引率
18.90%
发文量
435
审稿时长
37 days
期刊介绍: Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.
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