Two-way inclined ground in-out type shield launching model test device capable of being accurately controlled
A model test device and two-way tilting technology, applied in the field of shield tunneling tests, to avoid system errors, ensure accuracy and reliability, and simplify operations
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[0038] (a) According to the actual situation and site conditions of the ground access shield tunneling project, the scale ratio is determined to be 1:20, the soil layer parameters are determined as shown in Table 2, the test plan is determined as shown in Table 3, and the selected diameter is Model shield machine 26 of 320mm and length of 1200mm. In order to eliminate the influence of boundary effects, a shield model box 1 with length a=6000mm, width b=3000mm, and height h=3000mm is selected, and the horizontal guide rail 3 is 200mm away from the top of the model box 1.
[0039] (b) Lay the soil mass. According to the soil layer information required by the test plan, the soil body 2 is laid. The height of the soil body 2 is 1800mm. The soil layer settings are shown in Table 2. The soil samples are all taken from the construction site. As shown in the figure, while the soil is being laid, earth pressure cells are set on both sides of the expected propulsion axis, and displacem...
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