Large-diameter shield soil body movement convergence model and calculation method thereof

Abstract

The invention relates to the field of tunnels and underground engineering, in particular to a large-diameter shield soil movement convergence model and a calculation method thereof. According to the large-diameter shield soil movement convergence analysis model and the calculation method, different convergence modes of soil around a large-diameter shield tail after a lining is disengaged from theshield tail are achieved, and the large-diameter shield soil movement convergence analysis model and the calculation method better conform to engineering practice. The method comprises the steps thatstep 1, assumption of a large-diameter shield soil body movement convergence model is put forward; Step 2, a uniform vertical movement convergence model of the large-diameter shield soil body is established; 3, an uneven vertical movement convergence model of a large-diameter shield soil body is established; 4, a calculation method of stratum deformation under the uniform and non-uniform verticalmovement convergence model of the large-diameter shield soil body is adopted; by means of the method, stratum deformation caused by large-diameter shield construction can be predicted more accurately,a reliable and effective calculation method is provided for regulation calculation, engineering problems caused by stratum deformation can be reduced, and remarkable engineering value and economic benefits are achieved.

Description

technical field [0001] The invention relates to the field of tunnels and underground engineering, in particular to a large-diameter shield soil movement convergence model and a calculation method thereof. Background technique [0002] The construction of shield tunnel requires that the stratum deformation be within the specified range, and the soil movement convergence model is the basis for calculating the stratum deformation. Many scholars at home and abroad have devoted themselves to proposing the convergence model and calculation method of soil movement in line with the actual tunnel. Most of the existing studies focus on the small and medium-diameter shield foundation, and it is believed that after the lining breaks out of the shield tail, the soil around the shield tail converges radially toward the lining center along the radial direction of the circumference. Therefore, a uniform radial soil movement convergence model and a non-uniform radial soil movement convergen...

AI Technical Summary

Problems solved by technology

As the diameter of the shield increases, the shield tail gap will also increase accordingly. At this time, if the self-weight of the soil and the effect of excavation unloading are still ignored, the results will have a large error

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