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A prediction method for stratum deformation induced by shield tunneling subway construction and its impact on ancient buildings

An ancient building and shield technology, applied in the field of stratum deformation induced by shield tunnel construction and the estimation of the impact on ancient buildings, can solve the problem of lack of systematic analysis methods, lack of in-depth research, lack of systematic analysis procedures and ideas, etc. question

Active Publication Date: 2019-05-28
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) There is a lack of in-depth research on the summary and induction of a large amount of monitoring data of ground displacement induced by shield tunneling in urban subways, and a systematic and standardized analysis method has not yet been formed, which has little guiding significance and experience analogy for similar projects in the later stage; (2) Shield There are many methods for estimating stratum displacement induced by structural construction, and their emphases are different. At present, it is still lack of comprehensive consideration of various influencing factors of induced stratum displacement in the stratum displacement estimation system; (3) for the internal part of the stratum There is a lack of prediction methods for settlement characteristics, and there is also a lack of corresponding evaluation methods for the impact of deep stratum settlement on underground linear structures or building foundations buried at different depths; (4) The stiffness of ancient buildings on the surface has certain constraints on stratum displacement , How to introduce the stiffness parameters of ancient building masonry structures into the natural stratum displacement estimation formula to comprehensively evaluate the deformation characteristics of ancient building foundations, there is currently a lack of systematic analysis procedures and ideas

Method used

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  • A prediction method for stratum deformation induced by shield tunneling subway construction and its impact on ancient buildings
  • A prediction method for stratum deformation induced by shield tunneling subway construction and its impact on ancient buildings
  • A prediction method for stratum deformation induced by shield tunneling subway construction and its impact on ancient buildings

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Experimental program
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Embodiment approach

[0109]Step 2: Select several typical monitoring sections of surface subsidence induced by shield construction, extensively collect formation parameters, shield construction parameters, and support parameters in the research area as the input parameters for numerical analysis to provide preparatory conditions. analysis software to build models, such as image 3 As shown, the numerical method is adopted to simulate the surface subsidence induced by shield tunneling, and the measured surface subsidence is used as the objective function, and the inversion analysis is carried out for the formation parameters, and the subsidence trough width i at different depths z below the surface is obtained directly z , the maximum settlement S max,z The evolution law with depth; if there is no measured data, the numerical analysis method can be used to obtain the characteristic parameters of deep formation subsidence, and the implementation method is as follows:

[0110] Step 2.1, obtain the u...

Embodiment

[0202] Take Xi'an Metro Line 2 and its section passing through the Ming City Wall at the South Gate as an example;

[0203] Step 1: Select 7 representative monitoring sections in a certain section of Xi’an Metro Line 2 with pile numbers 13+290~14+310, and use formulas (1)~(6) to calculate V l , i 0 ,K,S max,0 Inductive analysis, as shown in Table 3. It can be seen from Table 3 that the stratum loss rate of natural surface subsidence induced by shield tunneling construction of Xi’an Metro Line 2 is about V l = Between 0.8 and 2.9%, i 0 The relationship between the buried depth of the tunnel and H is described by formula (36): i 0 =0.43H(36);

[0204] Table 3 Characteristic parameters of surface subsidence at the measured section

[0205]

[0206] Step 2, carrying out the numerical analysis of deep formation subsidence law, needs to carry out the following steps:

[0207] Step 2.1, determine the formation physical and mechanical parameters of the actual monitoring sect...

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Abstract

The invention discloses an estimating method for stratum deformation induced by shield subway construction and the influence of stratum deformation on ancient buildings. The estimating method comprises an induction back analysis and value inversion analysis method based on actually-measured data, the calculation method, based on the stratum loss principle, of ground surface settlement induced by shield construction and an ancient building foundation deformation characteristic evaluation method based on the stiffness correction method. Through the induction back analysis and value inversion analysis method based on the actually-measured data in engineering practice, the characteristic parameters and the characteristic parameter rules of stratum displacement induced by shield subway construction are obtained; based on the stratum loss principle and the Peck formula, the ground surface settlement predicting formula of shield construction parameters is provided; and finally, the stiffness correction method principle is introduced into the formula to estimate the deformation characteristics of the ancient building foundations, so that the systematic evaluation of stratum displacement and the influence of the stratum displacement on the ancient buildings is achieved, and a feedback analysis method is provided for prediction of stratum displacement induced by shield subway construction and the control measures of the construction technique.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering methods, and relates to a method for estimating stratum deformation induced by shield tunneling subway construction and its influence on ancient buildings. Background technique [0002] The urbanization process is advancing by leaps and bounds, and the construction of modern underground transportation facilities is also quickly included in the ranks of urbanization "business cards". However, the contradiction between the development of underground space resources and the existing urban infrastructure is also becoming more and more serious. The influence of buildings (structures) on the surface or in the stratum, underground pipelines, ancient buildings along the line, ancient ruins and underground cultural relics, etc., which has a great impact on the stratum displacement induced by shield tunneling in the mechanized operation of urban subways and its impact on adjacent ancient buildings...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/06G06F17/50
CPCE21D9/06G06F30/13
Inventor 朱才辉周远强崔晨
Owner XIAN UNIV OF TECH
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