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以上海某软土深基坑为研究对象,利用FLAC3D软件进行了9组正交试验,分析基坑开挖过程中隆起量、桩体位移和坑外土体沉降量。研究表明,基坑中间隆起量最大,基坑隆起量可以用指数模型y=AxB模拟,围护桩入土深度对隆起量影响最大;桩体左侧位移开始逐渐增加,当达到最大值18.91~35.58 mm后逐渐减小,桩径对桩体位移影响最大;土体沉降曲线呈现“勺子”状,坑外下侧土体沉降最大为40.76~51.68 mm,桩径对土体沉降影响最大。
Taking a deep foundation pit of a soft soil in Shanghai as the research object, 9 sets of orthogonal experiments were carried out by using FLAC3D software to analyze the uplift amount, pile displacement and the settlement of soil outside the pit during excavation. The results show that the maximum uplift of foundation pit and the uplift of foundation pit can be simulated by the exponential model y = AxB, and the depth of retaining wall affects the maximum of uplift. The left displacement of pile starts to increase gradually. When the maximum value reaches 18.91 ~ 35.58 mm, and then the pile diameter has the greatest effect on pile displacement. The settlement curve of soil shows “spoon ” shape. The maximum settlement of the soil outside the pit is 40.76 ~ 51.68 mm, and the pile diameter has the greatest influence on the soil settlement.