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为揭示水泥改良土冻胀对地层位移场的影响规律,促进人工冻结技术的发展,以南京地铁10号线盾构出洞水平冻结加固工程为例,对水泥改良土加固区冻胀引起的地层位移进行了三维数值模拟分析,研究了冻胀位移场的发展分布规律,并分析了不同因素变化对水泥改良土冻胀位移场的影响,计算结果表明:在冻土帷幕上方产生向上的冻胀位移,越靠近冻土帷幕,竖向位移越大;冻土帷幕左右两侧冻结时产生方向相反的水平位移;地表位移随着与出洞口距离的增加先增大后减小,最大冻胀位移并不在冻土帷幕的正上方;覆土厚度越大,地表位移越小;冻胀率、冻土壁厚度和冻土壁长度越大,地表位移越大;冻胀率和冻土壁厚度变化对位移场分布无影响,覆土厚度和冻土壁长度变化既影响水泥土冻胀位移场的大小,也影响位移场的分布。
In order to reveal the rules of the influence of frost heave on the displacement field of cement and to promote the development of artificial freezing technology, taking the horizontal freezing consolidation project of shield tunnel in Nanjing Metro Line 10 as an example, The 3D numerical simulation of displacement is carried out. The development and distribution of frost heave displacement field are studied, and the influence of different factors on the frost heave displacement field of cement-modified soil is analyzed. The calculation results show that frost heaving upward in the frozen soil curtain The closer the displacement is to the frozen soil curtain, the greater the vertical displacement is. The left and right sides of the frozen soil freeze to produce the opposite horizontal displacement. The surface displacement first increases and then decreases with the increase of the distance to the exit hole, Not directly above the frozen soil curtain; the greater the thickness of soil cover, the smaller the surface displacement; the greater the frost heave rate, frozen soil wall thickness and frozen soil wall length, the greater the surface displacement; The distribution of displacement field has no effect. The change of soil thickness and the length of frozen soil wall not only affects the size of the displacement field but also the distribution of displacement field.