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基于ANSYS有限元软件,构建沉管节段三维数值模型,在节段接头处定义接触单元,采用只受压的杆单元模拟橡胶支座,并定义其为双折线材料。调节沉管下部土层的弹性模量与泊松比,模拟沉管隧道在不均匀荷载及沉降条件下的纵向弯曲与扭转工况。通过分析节段接头剪力键的应力及剪力分布特征,研究沉管接头剪力键在上述工况下的受力特性。并将数值结果与大比例尺节段接头剪力键模型试验结果相对比。主要结论:两类工况中,竖向剪力键承担了几乎全部的竖向剪力,但对水平方向的抗剪基本不起作用,而水平剪力键在两类工况中都产生了水平剪力;扭转工况中,地层较软一侧竖向剪力键剪力较大;在剪力键端头角点及与节段衔接处局部应力较大。
Based on the finite element software ANSYS, a three-dimensional numerical model of immersed pipe segment was constructed. The contact element was defined at the joint of the segment. The rubber bearing was modeled by only the rod element under compression and was defined as a double-fold material. The elastic modulus and Poisson's ratio of soil under the immersed tube are adjusted to simulate the longitudinal bending and torsion conditions of immersed tunnel under uneven load and settlement. By analyzing the stress and shear distribution characteristics of the shear bond of the segment joints, the stress characteristics of the shear bond of the immersed pipe joint under the above conditions are studied. The numerical results are compared with the results of the shear bond model test of large-scale segment joints. MAIN CONCLUSIONS: In the two types of conditions, the vertical shear bond takes almost all of the vertical shear force, but basically has no effect on the shear resistance in the horizontal direction, whereas the horizontal shear bond produces both types of conditions Horizontal shear; In the torsion condition, the shear force on the softer side of the strata is larger; and the local stress at the tip corner of the shear bond and the convergence with the segment is larger.