Two-Dimensional Numerical Solution Method for Surrounding Rock Pressure of Shallow Buried Shield Tunnel
A technology of surrounding rock pressure and shield tunneling, which is applied in image data processing, electrical digital data processing, and special data processing applications. Calculation time and storage space are reduced, the modeling process is simple, and post-processing is convenient.
Active Publication Date: 2021-11-30
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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However, in many current two-dimensional analyzes, most of them believe that the rock layer will interact with the segment immediately after excavation, without considering the lining hysteresis or over-excavation gap in actual engineering; some studies consider these effects based on the stress release rate, but this assumption mainly It is suitable for deep-buried tunnels. For shallow-buried tunnels, it is difficult to simulate according to the stress release rate due to the formation loss of the excavated rock formation and the uneven deformation of the rock and soil around the tunnel.
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[0049] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The protection scope of the present invention is not limited only to the description of this embodiment.
[0050] A two-dimensional numerical solution method for the surrounding rock pressure of a shallow-buried shield tunnel, the implementation flow chart is as follows figure 1 As shown, the specific steps are as follows:
[0051] 1) According to the geological survey report, on-site and indoor test results, the geometric parameters of the structure are extracted, including the buried depth of the tunnel and the diameter of the shield, and the material parameters of the rock formation are extracted, including the lateral pressure coefficient, Poisson's ratio, deformation modulus, and weight. The tunnel geometry parameters and rock formation material parameters in the example are listed in Table 1.
[0052] Table 1 selects the value of working...
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The invention relates to a two-dimensional numerical solution method for the surrounding rock pressure of a shallow-buried shield tunnel, which includes: 1) extracting the geometric parameters and material parameters of the structure according to the geological survey data, using the two-dimensional finite element software ROCSCIENCE PHASE2 to establish a model, and assigning Material properties and unit properties, clarify the boundary conditions of the model; 2) Apply gravity loads according to the material properties, and calculate the model to a balanced state; 3) Excavate tunnels in the model, clarify the non-uniform deformation convergence mode based on the gap parameters, and adjust the rock boundary The stress of each node is used to control the displacement boundary, and the model is calculated to an equilibrium state; 4) Segment elements are applied at the tunnel boundary, and the stress is released, and the model is calculated to an equilibrium state; 5) According to the equilibrium model, different positions of the tunnel excavation boundary are obtained The pressure distribution of the surrounding rock. The invention provides a surrounding rock pressure calculation method that can quickly obtain results, has a simple calculation process, and is easy to be popularized and applied in shield tunneling subway structure design and analysis.
Description
technical field [0001] The invention belongs to the technical field of computer-aided design of shield tunneling subway engineering, and relates to a numerical solution method for surrounding rock pressure of shield tunneling subway tunnels. Background technique [0002] After the tunnel is excavated in the rock stratum, the rock and soil mass is disturbed, causing stress redistribution and then convergent deformation into the tunnel. Due to the obstruction by the support, pressure will be generated on the contact surface between the support and the rock stratum. The load on the structure, that is, the surrounding rock pressure. As the core content of the relationship between tunnel surrounding rock and supporting structure, the action mode and calculation method of surrounding rock pressure are of great significance to the smooth progress of tunnel construction, and have always been a hot issue concerned by tunnel academic and engineering circles. [0003] As shield shallo...
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IPC IPC(8): G06F30/12G06F30/17G06F30/23G06T17/20G06F111/04G06F119/14
CPCG06T17/205G06F30/12G06F30/17G06F30/23G06F2111/04G06F2119/14
Inventor 崔岚盛谦肖平黄珏皓
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI