高压水射流切割混凝土试验与数值模拟

doi:10.19952/j.cnki.2096-5052.2023.04.05

Hazard Control in Tunnelling and Underground Engineering

2023, Vol. 5

Issue (4): 47-56 DOI: 10.19952/j.cnki.2096-5052.2023.04.05

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Experimental and numerical simulation of high-pressure water jet cutting concrete

ZHANG Ning¹, HUANG Xinjie^2,3, WANG Chuan¹, XU Bin^2,3, ZHANG Jiancheng^2,4, ZHANG Bo^2,4*

1. Shandong High Speed Group Co., Ltd., Jinan 250101, Shandong, China;
2. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, Shandong, China;
3. School of Qilu Transportation, Shandong University, Jinan 250061, Shandong, China;
4. School of Civil Engineering, Shandong University, Jinan 250061, Shandong, China

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Abstract Aiming at the problem of demolition of existing concrete buildings in underground space construction, the effects of different water jet parameters and cutting process parameters on the performance of high-pressure water jet damaged concrete were systematically investigated through indoor experiments and numerical simulations, and the stress distribution and crack extension characteristics of concrete under the impact of water jet were analyzed. The test results showed that the depth of high-pressure water jet cutting concrete increased linearly with the increase of pump pressure, increased first and then decreased with the increase of target distance, decreased with the increase of the number of cutting growth rate, with the decrease of traverse speed growth rate gradually became larger. The effective stress near the center point of the high-pressure water jet impact exceeded the strength of the concrete, leading to the failure of the concrete. Cracks propagate along the peak point of the effective stress and continuously penetrated to form flaky spalling. In addition, for water jet cutting of strongly restrained concrete, the main damage was dominated by water jet cutting joints and surface concrete flake spalling, while for weakly restrained concrete, the damage was dominated by segmental excision. When there was a free surface inside the concrete, it was more likely to form through cracks and produce a large-volume breakage.

Key words： high-pressure water jet concrete cutting performance numerical simulation

Received: 14 August 2023 Published: 19 December 2023

ZTFLH:	TU94+1
	TU746.3

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	ZHANG Ning
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	ZHANG Bo

Cite this article:

ZHANG Ning,HUANG Xinjie,WANG Chuan, et al. Experimental and numerical simulation of high-pressure water jet cutting concrete[J]. Hazard Control in Tunnelling and Underground Engineering, 2023, 5(4): 47-56.

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http://tunnel.sdujournals.com/EN/10.19952/j.cnki.2096-5052.2023.04.05 OR http://tunnel.sdujournals.com/EN/Y2023/V5/I4/47

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