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
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.
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