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A Calculation Method for Soil Deformation Caused by Construction Deflection of Double-circle Shield Tunnel

A double-circle shield and soil deformation technology, which is applied to measuring devices, instruments, etc., can solve the problems of incomplete soil deformation field, inability to calculate soil deformation, and complex cross-section of double-circle shield tunnels, and achieve accurate calculation. , easy to operate, easy to operate

Active Publication Date: 2017-11-14
重庆桐雨石科技有限公司
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Problems solved by technology

However, the cross-section of the double-circle shield tunnel is complex, and the traditional empirical statistical method is no longer applicable to the calculation of soil deformation caused by its construction, and the deflection of the shield during construction cannot be avoided, resulting in more complex soil deformation calculations
At present, there are also calculation methods that use random medium theory to predict soil deformation, but these methods cannot calculate the soil deformation below the depth of the tunnel top, and the obtained soil deformation field is incomplete

Method used

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  • A Calculation Method for Soil Deformation Caused by Construction Deflection of Double-circle Shield Tunnel
  • A Calculation Method for Soil Deformation Caused by Construction Deflection of Double-circle Shield Tunnel
  • A Calculation Method for Soil Deformation Caused by Construction Deflection of Double-circle Shield Tunnel

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Embodiment

[0069] According to the tunnel design and geological survey data: a double-circle shield tunnel is used for construction. The section diameter of the shield machine is 9.36m and the width is 15.86m. The buried depth of the section where the soil deformation is calculated is 20.68m. 0.38, and the soil loss rate is 0.83%. Get R according to the size of the shield machine 1 =4.68m, t=3.25m; substituting into formula (1) to get R 2 =4.66m; substituting formulas (2) to (3) to obtain the function of soil deformation caused by unit soil loss:

[0070]

[0071]

[0072] (1) Under normal working conditions (deflection angle α is 0°)

[0073] According to formulas (4)~(7), four integral subfields are divided, and the integral limit of each subfield is:

[0074] S I : {(r,θ)|0≤r≤4.68, 0.803≤θ≤5.480}∪{(r,θ)|0≤r≤3.25 / cosθ, -0.803≤θ≤0.803}

[0075] S II : {(r,θ)|0≤r≤4.68, -2.338≤θ≤2.338}∪{(r,θ)|0≤r≤3.25 / cos(π-θ), 2.338≤θ≤3.945}

[0076] S III : {(r,θ)|0≤r≤4.66, 0.799≤θ≤5.484}∪...

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Abstract

The invention relates to a calculation method for soil deformation caused by construction deflection of a double-circle shield tunnel, comprising the following steps: 1) drawing a two-dimensional cross-sectional view of the excavation of a double-circle shield tunnel; 2) determining the convergence radius of the tunnel; 3) Draw the shape, size and position of tunnel convergence; 4) establish the overall Cartesian coordinate system; 5) establish the local polar coordinate system; 6) establish the functional relationship of soil deformation caused by unit soil loss; 7) divide the distribution area of ​​soil loss Algebraic sum divided into 4 sub-domains; 8) Calculate the total soil deformation component; 9) Determine the soil deformation amount and direction according to the soil deformation component. This method is easy to operate, and can accurately obtain the vertical and lateral deformation of any position of the surface and underground soil caused by the construction of the double-circle shield tunnel through simple design parameters and program calculations, so that the soil deformation of the entire cross section can be simulated field. The method can not only calculate the soil deformation caused by double-circle shield tunnel construction under normal working conditions, but also can calculate the soil deformation under arbitrary deflection working conditions, and can be written into simple program software, which is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of shield tunnel construction in tunnel engineering, and relates to a calculation method for soil deformation caused by construction deflection of a double-circle shield tunnel, which is suitable for soil deformation caused by construction of a shallow-buried double-circle shield tunnel in a soft soil layer Prediction. Background technique [0002] In the construction of urban shallow buried tunnels such as subway tunnels and underground pipe networks, the prediction and control of surface and underground soil deformation caused by construction is an extremely important topic. For traditional single-circle tunnel construction, the prediction of soil deformation usually adopts the empirical statistical method, that is, the soil settlement curve is assumed to be an inverted normal distribution curve, which is determined by the maximum settlement value and the settlement trough width coefficient. As a new tunn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/32
Inventor 黄达曾彬
Owner 重庆桐雨石科技有限公司
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