Influence of stress wave incident angles on spalling failure in rock-mortar composites: experimental and simulation study

• Autorzy: Bai Yunfan , Wang Shiming , Shen Yan , Wang Jiaqi , Wu Qiuhong , Zhou Jian , Li Chuanqi

Identyfikatory

DOI

10.1007/s43452-024-00917-6

• Języki publikacji: EN

Abstrakty

EN

This paper aims to reveal the influence of stress wave incidents at different angles on surrounding rock and supporting mortar. The split Hopkinson pressure bar device with a diameter of 50 mm was used to carry out the spall failure test of rock-mortar composite specimens under the incident stress wave at the angel of 30°, 45°, 60°, and 90°, and the spall failure process of the specimens was recorded by a high-speed camera. The test results show that the incident angle of the stress wave is an important factor in determining the initial spalling position and spalling strength. Oblique incidence increases the number of reflections of the stress wave in mortar resulting in the stress state of mortar being different. Under the same impact conditions, with the decrease of the incident angle, the distance between the initial spalling position and the free end of the specimen increases, and the maximum initial spalling position is obtained at the incident angle of 30°. The incident angle is positively correlated with the specimen spalling strength, and the maximum spall strength is obtained at the incident angle of 90°. In addition, the simulation results provided by Particle Flow Code were in good agreement with the test results. The simulation reflects that the spalling failure degree is affected by the incident angle of the stress wave, and the number of spalling layers of the specimens increases with the increase of the oblique incident angle. This paper can provide a reference for the excavation support design of underground engineering.

Słowa kluczowe

EN

rock mortar composite; stress wave; wave oblique incidence; spalling failure; numerical simulation

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2024
• Tom: Vol. 24, no. 2
• Strony: art. no. e104, 2024
• Opis fizyczny: Bibliogr. 41 poz., rys., tab., wykr.

Twórcy

autor

Bai Yunfan

• School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China

autor

Wang Shiming

• School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China

• https://orcid.org/0000-0002-6956-0423

autor

Shen Yan

• China Bluestar Chonfar Engineering and Technology Co., Ltd, Changsha 410083, Hunan, China

autor

Wang Jiaqi

• School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China

autor

Wu Qiuhong

• Work Safety Key Laboratory On Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan University of Science and Technology, Xiangtan 411201, China

autor

Zhou Jian

• School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan, China

autor

Li Chuanqi

• Laboratory 3SR, CNRS UMR 5521, Grenoble Alpes University, 38000 Grenoble, France

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025).