Method for evaluating influence of shield tunnel undercrossing on existing shield tunnel
A technology of shield tunneling and evaluation method, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of complex calculation and long time consumption.
Active Publication Date: 2019-09-17
ZHEJIANG UNIV CITY COLLEGE
View PDF3 Cites 18 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004]
In order to overcome the shortcomings of complex calculation and time-consuming evaluation methods for the impact of existing shield tunnels passing under existing shield tunnels, the present invention provides a simple and practical shield tunnel passing under existing shield tunnels. Impact Evaluation Method
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0102] The present invention will be further described below in conjunction with the accompanying drawings.
[0103] refer to Figure 1 to Figure 10 , a method for evaluating the impact of a shield tunnel underpass on an existing shield tunnel, the method comprising the following steps:
[0104] 1) Calculate the load mode of the existing tunnel before crossing, considering the external load acting on the lining structure, including vertical earth pressure, lateral earth pressure, foundation reaction force and structure self-weight;
[0105] 2) Calculate the additional stress generated by the tunneling of the shield machine during crossing, taking into account the additional stress generated by soil loss, additional thrust of the cutter head, friction of the shield shell, and additional grouting pressure;
[0106] 3) Use ABAQUS to establish a shield tunnel segment model, obtain the horizontal displacement, vertical displacement and bolt stress of the shield tunnel segment stru...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
A method for evaluating the influence of the shield tunnel undercrossing on an existing shield tunnel comprises the following steps of (1) calculating a load mode of the existing tunnel before undercrossing, and considering the external loads acting on a lining structure, wherein the external loads comprise the vertical soil pressure, the lateral soil pressure, the foundation counterforce and the structure dead weight; 2) calculating the additional stress generated by tunneling of the shield tunneling machine during crossing, wherein the additional stress generated by soil loss, cutter head additional thrust, shield shell friction force and additional grouting pressure is considered in the method; and 3) establishing a shield tunnel segment model by utilizing ABAQUS to obtain the horizontal displacement, vertical displacement and bolt stress of the shield tunnel segment structure, and further analyzing the influence of undercrossing on the existing tunnel. According to the present invention, based on a load-structure method, the method for evaluating the influence of the existing shield tunnel can be provided by combining a theoretical solution and the numerical simulation and according to a specific undercrossing working condition.
Description
technical field [0001] The invention relates to an evaluation method for the influence of the underpass of a shield tunnel on an existing shield tunnel, and belongs to the technical field of underground engineering. Background technique [0002] The existing main method for evaluating the influence of the underpass of the shield tunnel on the existing shield tunnel is to establish a 2D / 3D finite element solid model, that is, to establish a soil model, and use the life-and-death element method to simulate the tunnel excavation, and obtain the shield The overall settlement and stress of the structural tunnel. This method is complex in numerical simulation modeling, time-consuming in calculation, and the entire model needs to be rebuilt when conditions such as the penetration angle and shield tunnel diameter change, making the actual evaluation more complicated. [0003] With the continuous advancement of urbanization in our country, the construction of urban rail transit is i...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50E21D9/06E21D11/08
CPCE21D9/06E21D11/08G06F30/23G06F2119/06Y02E10/20
Inventor 丁智朱黄鼎魏新江
Owner ZHEJIANG UNIV CITY COLLEGE