Multi-peak attenuation effect of double tunnels in water-sealed storage cavern under variable amplitude impacts based on similar models
HU Hongli1, CHANG Suling1, CONG Yu1, 2, WANG Xiaoshan1, WANG Zaiquan1, ZHANG Jigang1, 2, LI Renjie3, JIANG Hao3
(1. School of Civil Engineering, Qingdao University of Technology, Qingdao, Shandong 266520, China; 2. Engineering
Construction and Safety Collaborative Innovation Centre in the Blue Economic Zone, Qingdao, Shandong 266520, China;
3. Shandong Electric Power Engineering Consulting Institute Corp., Ltd., Jinan, Shandong 250013, China)
Abstract： To investigate the effects of variable amplitude impact loading on straight-wall-top-arch double tunnels, a large-scale model of high-strength concrete tunnels was constructed. A self-developed pendulum impact system, capable of applying biaxial stresses, was utilized to conduct the impact tests. A super-dynamic data acquisition system was employed to record the impact waves and three-dimensional strains, while digital image correlation (DIC) was used to analyze the surface strains and displacement fields. This approach allowed for a comprehensive examination of the mutation characteristics of double tunnels subjected to pendulum impacts. The experimental results yielded several key findings: (1) The frequency of the shock wave generated by the pendulum ranged from 100 to 200 Hz, exhibiting a wave curve characterized by a peak incremental stage, an oscillatory decay stage, and a stable stage, indicating a variable amplitude shock wave with amplitude attenuation. The frequency decay amplitude increased from 9.30% to 43.88% under multiple impacts. (2) Five symmetrical cracks were observed in the spandrel and foot of the double tunnels, with a wide and deep crack at the inter-cavern arch foot manifesting as an upward concavity. The damage pattern was primarily influenced by the first wave peak of the impact force, leading to an increase in the width of the crack at the inter-cavern arch foot by nearly six times under multiple impacts. (3) The predominant strain type was tensile strain, with a peak axial strain of approximately 10 400×10－6 observed at the inner arch foot, a peak radial strain of about 10 600×10－6 at the inter-cavern arch foot, and a peak circumferential strain of roughly 24 800×10－6 at the outer arch spandrel. Under multiple impacts, the strain increased by approximately 25 times in the axial direction and five times in the radial direction. (4) Vertical strain concentration zones first appeared in the inter-cavern arch foot within 350×10－6. Cracks in the inter-cavern arch foot developed from the two inner arch feet, with strain values stabilizing in the range of 0.002 to 0.005. Shear strain concentration zones were identified in the outer spandrel and inter-cavern arch foot, exhibiting opposite strain behaviors on the left and right sides. The vertical strain peak at the inter-cavern arch foot increased by 42.98%. Considering the crack width and three-dimensional strain data, it was concluded that the inter-cavern arch foot represents the weakest point of the double tunnels under variable amplitude impacts, necessitating enhanced monitoring and support in this area.
胡鸿丽1，常素玲1，丛 宇1，2，王肖珊1，王在泉1，张纪刚1，2，李仁杰3，江 浩3. 变幅冲击荷载下水封洞库双隧洞岩体多波峰衰减效应的相似模型研究[J]. 岩石力学与工程学报, 2025, 44(7): 1897-1910.
HU Hongli1, CHANG Suling1, CONG Yu1, 2, WANG Xiaoshan1, WANG Zaiquan1, ZHANG Jigang1, 2, LI Renjie3, JIANG Hao3. Multi-peak attenuation effect of double tunnels in water-sealed storage cavern under variable amplitude impacts based on similar models. , 2025, 44(7): 1897-1910.
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2025, Vol. 44 
