Calculation method for ground surface settlement outside foundation pit due to dewatering of incomplete well in the foundation pit of phreatic stratum

A technology for surface subsidence and complete wells, applied in calculations, special data processing applications, instruments, etc., can solve the problems of not considering the special influence of precipitation curves and large errors, and achieve the effects of small errors, effective guidance, and accurate calculation results

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

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Problems solved by technology

[0003] 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, therefore, the results calculated by the calculation method in the prior art have a large error from the actual

Method used

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  • Calculation method for ground surface settlement outside foundation pit due to dewatering of incomplete well in the foundation pit of phreatic stratum
  • Calculation method for ground surface settlement outside foundation pit due to dewatering of incomplete well in the foundation pit of phreatic stratum
  • Calculation method for ground surface settlement outside foundation pit due to dewatering of incomplete well in the foundation pit of phreatic stratum

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Embodiment 1

[0058] 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:

[0059] The present invention provides a method for calculating surface settlement outside the foundation pit caused by dewatering of an incomplete well in a foundation pit of a submerged stratum, comprising the following steps:

[0060] 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 submerged stratum; thus, the water level drop at any position outside the foundation pit caused by the precipitation in the foundation pit can be obtained, and a simplified calculation model of surface settlement can be established Such as figure 1 .

[0061] S2, the precipitation curve is fitt...

Embodiment 2

[0098] The movement of groundwater caused by precipitation will generate a new seepage field and break the initial static equilibrium state, so that both the seepage field and the stress field of the soil around the well will change, and the additional stress caused by the seepage force is the dehydration and consolidation of the upper layer. The most important cause of compaction, ignoring other secondary factors, the direction of the additional stress is approximately the same as the direction of seepage force. In the seepage area, there are horizontal components and vertical components in the seepage force due to the seepage action, so the direction of the seepage force is tangent to the stable water table at any point and points to the foundation pit. After the precipitation infiltration curve is formed, it is divided into a dry part and a saturated part above and below the curve. Throughout the precipitation history, s 1 The soil in the area is drained, s 2 The soil in ...

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Abstract

The invention discloses a calculation method for ground surface settlement outside a foundation pit due to dewatering of an incomplete well in the foundation pit of a phreatic stratum. The calculationmethod comprises the following steps: S1, performing precipitation model test design in the foundation pit; S2, fitting the precipitation curve; S3, dividing the precipitation curve in the step S1 into a sparse part and a saturated part; S4, calculating the settlement amount of the drainage area by adopting a first specification formula, and calculating the settlement amount of the saturation area by adopting a second specification formula; and S5, calculating the final settlement amount of the ground surface outside the pit by adopting a third formula. Verification data show that the calculation method has the advantage of high accuracy and can meet the existing engineering requirements. Theoretical basis and basis are provided for research of foundation pit continuous wall deformation caused by incomplete well precipitation in the foundation pit, 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 foundation pit caused by dewatering of an incomplete well in a foundation pit of a submerged formation. Background technique [0002] At present, the calculation methods for the surface settlement caused by the precipitation of submerged foundation pits include JGJ 120-2012 "Regulations for Building Foundation Pit Support", JSJ 311-2013 "Technical Specifications for Construction Safety of Deep Foundation Pit Engineering" and SJG05-2011 "Shenzhen Deep Foundation Pit Engineering". Technical Specifications for Foundation Pit Support” and other normative methods, these methods are all based on the layered sum method to estimate the settlement caused by precipitation. The calculation formula of the standard method is simple, but there is no clear calculation formula for the water level drawdown at any pos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F2111/10G06F30/20G06F30/13
Inventor 赵伯明杨清源王子珺刘树亚解廷伟
Owner BEIJING JIAOTONG UNIV
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