Method for predicting subsidence amount of ultra-long pile group by using stress dispersion mode

A technology of diffusion mode and settlement amount, applied in the field of geotechnical engineering, can solve problems such as complicated calculation methods, inconvenient engineering applications, and lack of consideration, and achieve the effect of simplifying the calculation process, small difference in measured settlement, and simple and easy-to-master calculation process

Active Publication Date: 2017-12-05
SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
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Problems solved by technology

The settlement analysis methods of conventional pile groups are mostly based on the equivalent pier method or the linear superposition method of additional stress caused by the load in the elastic half space, and will not consider the significant compression deformation of the super-long pile group and the load sharing effect of the soil between the piles. The influence of historical factors of soil stress caused by geological causes or foundation pit excavation and unloading on the settlement calculation of super-long pile groups is also not considered. The calculated settlement is generally larger than the actual result, and the calculation method is complicated, which is not convenient for engineering application

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  • Method for predicting subsidence amount of ultra-long pile group by using stress dispersion mode
  • Method for predicting subsidence amount of ultra-long pile group by using stress dispersion mode
  • Method for predicting subsidence amount of ultra-long pile group by using stress dispersion mode

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Embodiment 1

[0041] Embodiment 1: This embodiment specifically relates to a method for predicting the settlement of super-long pile groups using the stress diffusion model. Consolidation state, according to engineering experience and soil engineering properties, the additional stress is estimated according to a certain diffusion angle, which avoids the calculation process of using complex formulas, is the most simplified, does not need to introduce empirical correction coefficients, and reduces the difficulty of parameter selection and the calculation process. complexity. When estimating the settlement, the initial depth of stress diffusion can be determined according to the specific conditions of the ultra-long pile group, and the soil compression within the length range of the ultra-long pile group and the soil compression under the pile tip are not distinguished, which is applicable to conventional pile groups and rapid estimation of the settlement of super-long pile groups. The method...

Embodiment 2

[0078] Embodiment 2: This embodiment takes "a certain central building" as an example to specifically describe the method of predicting the settlement of super-long pile groups by using the stress diffusion model considering the stress history of the soil body.

[0079] (1) Project overview

[0080] The main building of the building has a total of 122 floors, a height of 632m, and a total construction area of ​​about 576,000m2 2 , the floor area of ​​the main building is 8684m 2 , giant frame core tube structure, the core tube area is about 1936m 2 , the piled raft foundation is adopted, the plane of the raft (ie the floor) is octagonal, the thickness of the raft is 6m, and the buried depth is 30.5m.

[0081] The ultra-long pile group is divided into two pile types, A and B: pile A is 86m in length, 56m in effective length, located in the middle area of ​​the core tube, with 247 piles, and post-grouting at pile ends; pile B is 82m in length, 52m in effective length, located ...

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Abstract

The invention discloses a method for predicting the subsidence amount of an ultra-long pile group by using a stress dispersion mode. The method comprises the following steps that the additional stress of each soil layer in the thickness range of a compressed layer, in which the stress dispersion is considered, of the ultra-long group pile is calculated; the additional stress is compared with early-stage consolidation pressure, a corresponding soil layer compression amount calculation formula is selected according to the comparison result of the additional stress and the early-stage consolidation pressure to carry out compression amount calculation, the compression amount is calculated according to a layerwise summation method, and then the subsidence amount of the ultra-long pile group is predicted. The method has the advantages that influences of soil body stress history such as natural deposition of a soil body and deep foundation pit earthwork on ultra-long pile group subsidence are fully considered, the peripheral area of the pile group serves as a reference, additional stress is calculated from the soil layer where a pile body takes into account stress diffusion, the compression amount is calculated according to the layerwise summation method, the calculation process is simplified, and the process that a complex formula is used for calculation is avoided; the difference between a calculation result and the actually measured subsidence is small, the calculation result does not need any empirical correction, and the method can be conveniently applied to practical engineering.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a method for predicting the settlement of super-long pile groups by using a stress diffusion model in consideration of soil stress history. Background technique [0002] At present, there are few studies on the settlement analysis methods of ultra-long pile groups in geotechnical engineering, and the settlement analysis methods of conventional pile foundations are usually referred to. The settlement analysis methods of conventional pile groups are mostly based on the equivalent pier method or the linear superposition method of additional stress caused by the load in the elastic half space, and will not consider the significant compression deformation of the super-long pile group and the load sharing effect of the soil between the piles. The influence of historical factors of soil stress caused by geological causes or foundation pit excavation and unlo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 顾国荣李韬陈晖宣霖康刘波
Owner SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
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