Two-dimensional numerical solution method for shallow-buried shield tunnel surrounding rock pressure
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, etc. It can solve problems such as simulation, difficulty, and no consideration of lining hysteresis or over-excavation gaps, etc., to achieve The post-processing is convenient, the modeling process is simple, and the calculation time and storage space are reduced.
Active Publication Date: 2021-03-12
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 shallow-buried shield tunnel surrounding rock pressure, which comprises the following steps of: 1) extracting geometric parameters and material parameters of a structure according to geological survey data, establishing a model by applying two-dimensional finite element software ROCSCIENCE PHASE 2, endowing material attributes and unit attributes, and defining model boundary conditions; 2) applying gravity load according to material attributes, and calculating the model to a balance state; 3) excavating a tunnel in the model, defining a non-uniform deformation convergence mode based on gap parameters, controlling a displacement boundary by debugging the stress of each node of a rock stratum boundary, and calculating the model to a balanced state; 4) applying a segment unit at the boundary of the tunnel, releasing the stress, and calculating the model to a balanced state; and 5) obtaining surrounding rock pressuredistribution at different positions of a tunnel excavation boundary according to the balance model. The invention provides a surrounding rock pressure calculation method which can quickly obtain a result, is simple in calculation process and is easier to popularize and apply in shield subway structure design 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