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Method for simulating construction course and tunnel deformation influence value of multiline overlapping tunnel

A technology for tunnel construction and numerical simulation, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as difficult convergence, deepen the understanding of the impact mechanism of multi-line overlapping shield tunnels, and achieve the effect of promoting development.

Active Publication Date: 2012-01-04
SHANGHAI UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the research on the existing overlapping tunnels has not yet involved the three-line or even four-line overlapping problems that have recently appeared, and at the same time, it aims at the defect that conventional numerical simulation methods are difficult to converge when simulating the construction conditions of large-angle oblique tunnels , a numerical simulation method for the construction process of multi-line overlapping tunnels and its influence on the deformation of subway tunnels is proposed, which is suitable for soft soil areas, so as to deepen the understanding of the impact mechanism of geotechnical environmental effects of multi-line overlapping shield tunnel construction

Method used

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  • Method for simulating construction course and tunnel deformation influence value of multiline overlapping tunnel
  • Method for simulating construction course and tunnel deformation influence value of multiline overlapping tunnel
  • Method for simulating construction course and tunnel deformation influence value of multiline overlapping tunnel

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Embodiment 1

[0028] see figure 1 , the numerical simulation method for the construction process of the multi-line overlapping tunnel and the influence on the deformation of the tunnel is characterized in that the operation steps of the simulation method are as follows:

[0029] The first step is to determine the basic physical and mechanical parameters of the soil and use the Drucker-Prager criterion to simulate the constitutive relationship of the soil: the basic physical and mechanical parameters of the soil are the weight of each layer of soil, cohesion, internal friction angle, compression modulus and Poisson's ratio, It is jointly determined by on-site in-situ tests combined with indoor tests; the Drucker-Prager criterion can better reflect the nonlinear characteristics of the soil, and at the same time, it can avoid the numerical calculation difficulties caused by the yield surface of other criteria at the corners, thereby avoiding the emergence of singular results;

[0030] The seco...

Embodiment 2

[0036] In this embodiment, a certain rail transit section tunnel project in Shanghai is taken as an example. During the excavation process of the tunnel, the construction double-line shield will successively pass through the upper and lower parts of the operating rail transit tunnel, forming a special working condition where four lines overlap. Among them, the minimum vertical clear distance between the uplink shield machine and the existing tunnel is 1.82m, and the minimum vertical clear distance between the downline shield machine and the existing tunnel is 1.69m, which belongs to the construction of ultra-close distance existing structures; at the same time, The angle between the crossing direction of the construction double-line shield tunnel and the rail transit operation tunnel is 75°, which belongs to the large-angle oblique crossing construction. Such as figure 1 As shown, the operation steps of the numerical simulation method for the construction process of the multi...

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Abstract

The invention belongs to the field of tunnel engineering and particularly relates to a method for simulating the construction course and a tunnel deformation influence value of a multiline overlapping tunnel. The method provided by the invention comprises the following operation steps: (1) determining a soil constitutive model; (2) simulating an initial dead-weight stress field; (3) simulating anequivalent layer structure; (4) simulating a tunnel duct piece structure; (5) simulating a slurry hardening course; and (6) simulating the influence course of shield propelling on subway tunnel operation. In the method provided by the invention, the complicated working conditions of multiline overlapping tunnel construction are considered in detail; a rigidness migration method is used for simulating a shield propelling course, wherein a life and death unit is preset in a lining and soil disturbance zone; and the dynamic course of shield construction is reflected by a method for activating the life and death unit to change the mechanics characteristics of the unit material in different construction steps. In the simulation method provided by the invention, a thin film unit is used for simulating the oblique crossing construction working conditions of the multiline overlapping tunnel at any angle; and the defect that a conventional finite element method is difficult to converge when the construction working conditions are simulated can be avoided.

Description

Technical field [0001] The invention belongs to the field of tunnel engineering, which involves a multi -line stacking tunnel construction process and the numerical simulation method affects the tunnel deformation. Background technique [0002] With the acceleration of urbanization, subway and rail transit have become an important fast and convenient public transportation method for major cities in my country.According to the existing plan, by 2020, there will be 177 lines built and operated in 28 cities in my country, and the total mileage will reach more than 6,100 kilometers.Shield Tunnels are widely used in projects such as urban underground railways and cross -river tunnels in soft soil areas. However, in actual construction, due to surface buildings and underground pile foundations, pipelines, and existing tunnels, the tunnel construction generalsIt is inevitable that the special construction conditions of the shields are overlapping up and down, such as: Shanghai Metro Lin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 张治国张孟喜吴惠明肖潇
Owner SHANGHAI UNIV
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