Calculation method for ground surface settlement outside pit caused by incomplete well precipitation in confined water stratum foundation pit

A technology for confined water and complete wells, which is used in calculations, special data processing applications, instruments, etc. It can solve the problems of low reference value, limited accuracy, and reduced accuracy in another area, and achieve high calculation accuracy, small errors, Calculate the effect of accurate results

Inactive Publication Date: 2019-10-11
BEIJING JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The key to this calculation method is the determination of the decompression head curve. Luo Guanyong et al. did not give detailed explanations and instructions, and this calculation method has limited accuracy and low reference value
[0004] Moreover, most of the existing calculation methods do not take into account the influence of the retaining wall on the bypass area and the non-circumvention area, so often the calculation formula can only be applied to one of the bypass area or the non-circumvention area, while for the other Significantly lower accuracy in one area

Method used

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  • Calculation method for ground surface settlement outside pit caused by incomplete well precipitation in confined water stratum foundation pit
  • Calculation method for ground surface settlement outside pit caused by incomplete well precipitation in confined water stratum foundation pit
  • Calculation method for ground surface settlement outside pit caused by incomplete well precipitation in confined water stratum foundation pit

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Embodiment 1

[0043] Such as image 3 As shown, this embodiment provides a method for calculating the precipitation curve outside the foundation pit caused by the precipitation in the foundation pit and calculating the surface settlement, including the following steps:

[0044] S1. Carry out the model test design of the precipitation in the foundation pit, and obtain the precipitation curve outside the foundation pit caused by the precipitation in the foundation pit of the confined water formation;

[0045] S2, using the method of fitting to the precipitation curve, obtain the precipitation curve fitting formula outside the foundation pit caused by the precipitation in the foundation pit of the confined water formation, and the fitting formula is:

[0046]

[0047] where h w After the precipitation is stable, the water content thickness of the soil layer outside the foundation pit closest to the retaining wall (h w The water level drop s of the soil layer can be subtracted from the wat...

Embodiment 2

[0078] There are still certain errors in the previous embodiment. Therefore, this embodiment proposes corresponding correction steps. In the confined water formation, due to the influence of the retaining wall, there will be precipitation on one side of the retaining wall, and two areas will appear on the other side , that is, the seepage area and the non-circumvention area. The seepage area is close to the retaining wall and is most affected by the retaining wall. The water flow is characterized by the presence of horizontal and vertical seepage at the same time. The non-infiltration area is far away from the retaining wall. The influence of the retaining wall can basically be ignored, and its water flow characteristic is that there is mainly seepage in the horizontal direction, and seepage in the vertical direction can be ignored. Therefore, it can be seen that the decompression value of the confined water in the seepage area is divided into a vertical decompression value com...

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Abstract

The invention discloses a calculation method for foundation pit exterior dewatering caused by precipitation in a confined water stratum foundation pit. The calculation method comprises: S1, conductingfoundation pit interior precipitation model test design; S2, applying a fitting method to the precipitation curve to obtain a curve fitting formula of precipitation outside the foundation pit causedby precipitation in the foundation pit of the confined water stratum, the fitting formula being; S3, calculating the settlement amount of the confined water stratum by adopting a first formula; wherein the first formula is shown in the specification. A Theoretical basis and a basis are provided for research on foundation pit continuous wall deformation caused by incomplete well dewatering in the foundation pit of the confined water stratum, and meanwhile important reference is provided for design and construction of foundation pit engineering dewatering.

Description

technical field [0001] The invention relates to the field of foundation pit dewatering. More specifically, it relates to a calculation method for surface settlement outside the pit caused by dewatering of an incomplete well in a foundation pit of a confined water formation. Background technique [0002] Most of the existing technologies are used to calculate the surface settlement of the precipitation outside the foundation pit. For the precipitation inside the foundation pit, the influence of the effective depth of incomplete precipitation on the surface settlement outside the pit is ignored, and the "concave" precipitation curve outside the incomplete pit is not considered. And the special influence of seepage force on the surface settlement outside the pit, etc. Therefore, the calculated results obtained by using the calculation methods in the prior art have large errors from the actual results. [0003] At present, for the deformation calculation of confined water strat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 杨清源赵伯明王子珺刘树亚解廷伟
Owner BEIJING JIAOTONG UNIV
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