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A Calculation Method of Stratum Displacement Caused by Tunnel Shield Construction

A technology of tunnel shielding and calculation methods, which is applied in calculation, complex mathematical operations, instruments, etc., and can solve problems such as errors and the applicability of formulas are not fully considered

Active Publication Date: 2018-12-25
DALIAN JIAOTONG UNIVERSITY
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Problems solved by technology

The empirical formula method is mainly based on the Peck formula and its extended formula, and its application premise is mostly based on the assumption that the formation loss of the Peck formula is constant, that is, the difference in formation loss at different depths and the applicability of the formula under different soil conditions are not fully considered. , so that there is a large error when using the empirical formula to predict the stratum displacement during the construction period

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  • A Calculation Method of Stratum Displacement Caused by Tunnel Shield Construction
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  • A Calculation Method of Stratum Displacement Caused by Tunnel Shield Construction

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Embodiment Construction

[0034] In order to clarify the specific implementation of the present invention, the present invention will be described in detail in conjunction with the monitoring results of the following model tests.

[0035] Through indoor model tests, the stratum displacement at different buried depths was measured. The test parameters include the buried depth of the tunnel at 0.8m, the thickness of the first soil layer in the overlying soil layer is 0.3m, the thickness of the second soil layer is 0.5m, and the excavation diameter of the tunnel is 20cm. figure 1 shown. The measuring points in the direction of vertical tunnel excavation are arranged at intervals of 10cm. In the depth direction, starting from the surface, the measuring points are arranged at intervals of 10cm. Using the origin software, input the displacement data of each measuring point, and fit the curves of the stratum settlement trough under different buried depths of the first layer, as shown in figure 2 shown. Th...

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Abstract

The invention discloses a computation method for strata displacement caused by the shield construction of a tunnel. The computation method comprises the following steps of measurement on the strata displacement in the initial stage of the construction; fitting of a strata loss inverse transfer function; and correction of an empirical formula. According to the method, research means such as field measurement, statistical analysis technique and empirical formula method are combined for exploring the forecast of the strata displacement mode aiming at the influences of practical engineering soil conditions and specific tunnel construction parameters. The method hierarchically considers differences of geological conditions and strata losses during the construction period, and utilizes displacement data collected in the initial stage of the construction to back analyze the strata settlement trough curves of different depths, thus obtaining the curve parameter more accordant with the coil conditions. The method fully considers the differences of strata losses, corrects the empirical formula of the maximal displacements and settlement trough width coefficients in different soil layers and back computes related parameters, and at last acquires the whole settlement trough displacement curve computation formula based on an assumption that the settlement trough curve follows Gaussian distribution.

Description

technical field [0001] The invention relates to the field of urban subway tunnel engineering, in particular to a calculation method for ground displacement caused by tunnel shield construction. Background technique [0002] The ground displacement caused by tunnel shield construction has brought certain influence on the safety and normal use of surface and underground structures. Therefore, how to predict the ground displacement caused by tunnel shield construction is the premise of safe tunnel construction. At present, the research on the ground displacement caused by tunnel shield construction mostly focuses on the surface displacement, while the research work on the ground displacement below the surface is relatively little. The existing calculation methods for formation displacement mainly include empirical formula method and analytical method, among which empirical formula method is widely used. The empirical formula method is mainly based on the Peck formula and its e...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50G06F17/15G06Q10/04
CPCG06F17/15G06F30/13G06Q10/04
Inventor 王海涛金慧张景元闫帅何永常胜涛
Owner DALIAN JIAOTONG UNIVERSITY
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