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近年来,随着基坑开挖深度增加,施工工期延长。使得北方地区的某些基坑工程不得不进入越冬期。土体冻胀将影响支护结构的稳定,温度不同,土体冻胀强弱不同。本文运用FLAC3D软件,模拟基坑悬臂桩支护结构,在-2℃,-5℃,-8℃,-10℃,-15℃,-19.5℃,-20℃和-21℃等不同温度作用下,支护结构的变形、水平冻胀力的分布模式及大小的作用规律,结果表明,随温度降低,土体冻深增大,支护结构顶部水平位移增大,水平冻胀力增大,并呈现中间大、两端小的抛物线型分布。
In recent years, as the excavation depth increases, the construction period is extended. Making some of the northern excavation project had to enter the winter. Soil frost heaving will affect the stability of the support structure, the temperature is different, soil frost heave strength is different. In this paper, FLAC3D software is used to simulate the cantilever pile supporting structure of foundation pit, and it can work under different temperatures of -2 ℃, -5 ℃, -8 ℃, -10 ℃, -15 ℃, -19.5 ℃, -20 ℃ and -21 ℃ The results show that with the decrease of temperature, the soil freezing depth increases, the horizontal displacement at the top of supporting structure increases, and the horizontal frost heaving force increases , And presents the middle large, small parabolic distribution at both ends.