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A Calculation Method for Tunnel Lining Design

A calculation method and lining technology, applied in tunnels, mining equipment, earthwork drilling and mining, etc., can solve the problem of not considering the effect of tunnel lining concrete water load force, not considering the conditional joint bearing of lining and surrounding rock, and not considering the surrounding rock Influence of loose ring on tunnel lining design and other issues

Inactive Publication Date: 2018-05-11
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, there are main problems in the existing calculation methods for tunnel lining design: (1) the physical effect of water load after the tunnel lining concrete is cracked is not considered; (2) the influence of the surrounding rock loose circle caused by construction disturbance on the tunnel lining design is not considered (3) The conditional joint bearing of lining and surrounding rock is not considered

Method used

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  • A Calculation Method for Tunnel Lining Design
  • A Calculation Method for Tunnel Lining Design
  • A Calculation Method for Tunnel Lining Design

Examples

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Embodiment 1

[0123] (1) Calculation conditions

[0124] The section of a tunnel is circular, and the inner radius of the lining is r 1 Is 1.75m, outer radius r 2 It is 2.15m. The lining concrete is labeled C25, and the Poisson's ratio and permeability coefficient are 0.167 and 1×10, respectively -9 m / s; the type of surrounding rock is Type IV, the deformation modulus of the complete rock mass is 3GPa, the Poisson's ratio and the permeability coefficient are 0.35 and 5×10, respectively -6 m / s, the surrounding rock permeability radius R is taken as 100 times the excavation radius; the thickness of the loose zone is 1m, the deformation modulus is 0.3GPa, the Poisson's ratio is 0.35, and the permeability coefficient is 5×10 -5 m / s. When reinforcing, the steel bars are arranged on the inner side of the lining concrete, the elastic modulus of the steel bars is 200GPa, and the thickness of the protective layer is 50mm. In this embodiment, the internal water pressure is 0.2 MPa.

[0125] (2) Design st...

Embodiment 2

[0134] (1) Calculation conditions

[0135] The section of a tunnel is circular, and the inner radius of the lining is r 1 Is 1.75m, outer radius r 2 It is 2.15m. The lining concrete is labeled C25, and the Poisson's ratio and permeability coefficient are 0.167 and 1×10, respectively -9 m / s; the type of surrounding rock is Type IV, the deformation modulus of the complete rock mass is 3GPa, the Poisson's ratio and the permeability coefficient are 0.35 and 5×10, respectively -6 m / s, the surrounding rock permeability radius R is taken as 100 times the excavation radius; the thickness of the loose zone is 1m, the deformation modulus is 0.3GPa, the Poisson's ratio is 0.35, and the permeability coefficient is 5×10 -5 m / s. When reinforcing, the steel bars are arranged on the inner side of the lining concrete, the elastic modulus of the steel bars is 200GPa, and the thickness of the protective layer is 50mm. In this embodiment, the internal water pressure is 1 MPa.

[0136] (2) Design step...

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Abstract

The invention provides a calculation method of tunnel lining design. The calculation method comprises the following steps: according to displacement continuous condition between a lining and a loosing circle and a water flow continuity condition among the lining, the loosing circle and an integral rock mass, calculating mutual acting force between lining concrete and the surrounding rock loosing circle during no crack; calculating the hoop stress of the inner surface of the lining concrete to calculate lining crack load and judge whether the lining concrete is cracked or not; calculating the mutual acting force between the lining and the surrounding rock loosing circle; judging whether the lining and the surrounding rock are separated or not, and determining an optimal reinforcement scheme of tunnel lining concrete. On the basis of a pervious lining theory and a lining surrounding rock conditional joint load mechanism, influence on a lining structure by the surrounding rock loosing circle is considered, a three-layer wall thickness cylinder model formed by the lining, the loosing circle and the integral rock mass is adopted to carry out tunnel lining design, a lining reinforcement scheme, and corresponding reinforcing steel bar stress on the crack, maximum crack width between the cracks and unit tube length seepage flow can be obtained.

Description

Technical field [0001] The invention relates to the technical field of hydraulic building structure design, in particular to a calculation method for tunnel lining design. Background technique [0002] In the design of tunnel lining, the calculation of water load mainly includes surface force theory and physical force theory. The face force theory assumes that the lining and surrounding rock are impermeable materials, and that water load is the boundary force acting on the surface of the lining and surrounding rock; the physical strength theory assumes that the lining and surrounding rock are permeable materials, and that the water load acts on the lining and surrounding rock. The volumetric force. Engineering practice shows that for low- and medium-pressure tunnels where the lining concrete does not crack, the theory of surface force is applicable to the lining design. For high-pressure tunnels, under the action of internal water pressure, the lining concrete will inevitably c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/14
CPCE21D9/14
Inventor 苏凯文喜雨伍鹤皋石长征
Owner WUHAN UNIV
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