Design method of uplift bearing capacity on short pile foundation of electric transmission line

A technology for transmission lines and design methods, which is applied in infrastructure engineering, calculation, electrical digital data processing, etc. The effect of improving work efficiency

Active Publication Date: 2019-11-08
POWERCHINA FUJIAN ELECTRIC POWER SURVEY & DESIGN INST CO LTD
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Problems solved by technology

However, when designing the uplift bearing capacity, since there is no contribution to the bearing capacity of the pile tip, the value of the above-mentioned safety factor K has a large error, and it does not conform to the actual uplift force mechanism of the pile foundation.

Method used

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  • Design method of uplift bearing capacity on short pile foundation of electric transmission line
  • Design method of uplift bearing capacity on short pile foundation of electric transmission line
  • Design method of uplift bearing capacity on short pile foundation of electric transmission line

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Embodiment Construction

[0033] Best practice:

[0034] Refer to attached figure 2 , a method for designing the uplift bearing capacity of short pile foundations of transmission lines, comprising the following steps:

[0035] 1) From the relevant knowledge of soil mechanics and Coulomb theory, it can be known that the shear strength of soil can be expressed in the following form:

[0036] τ f =σtanφ+c………①

[0037] 2) Assuming that the frictional resistance between piles and soil also follows the Coulomb shear strength theory, σ is the normal stress of the pile-soil contact surface, φ is the internal friction angle of the soil, c is the cohesion of the soil, and the values ​​of φ and c are called The shear strength index of the soil; from the calculation of the stress in the soil, the normal stress σ of the pile-soil contact surface is equal to the vertical self-weight stress multiplied by the lateral pressure coefficient,

[0038] σ=γhK 0 …………②

[0039] Where γ is the weight of the soil, h is t...

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Abstract

The invention relates to a design technology of the uplift bearing capacity of a shallow buried short pile foundation in electric transmission line construction engineering. According to the design method of the uplift bearing capacity on the short pile foundation of an electric transmission line, according to the principle of soil mechanics and shear strength index, pile side friction is established, the lateral friction changes linearly along the buried depths of piles, according to a standard value of the shear strength index, a standard value of pile peripheral friction is calculated, thecharacteristic weight of soil is introduced, thus a design model of the uplift bearing capacity on the short pile foundation based on the probability theory is established, finally, according to the shear strength index of the soil under different geological conditions, classification is conducted, uplift bearing capacity curves of the short piles with different pile diameters and pile lengths aredrawn, and design parameters of the short pile foundation are obtained. The design technology has the advantages that according to an actual pile foundation stress mechanism, the calculation error caused by using constant frictional resistance is avoided, the design error is effectively lowered, the accuracy is improved, and the working efficiency is greatly improved.

Description

technical field [0001] The invention relates to a design technology for the uplift bearing capacity of shallow-buried short pile foundations in the construction process of power transmission lines, and a design method for the uplift bearing capacity of short pile foundations in power transmission lines, which is suitable for piles whose burial depth is less than 5 times the pile diameter Analysis of uplift capacity of short piles for design of short pile foundations. Background technique [0002] Short piles refer to pile foundations where the pile depth is less than 5 times the pile diameter. Manually excavated pile foundations on overhead transmission lines are limited by manpower, and the buried depth is generally shallow, especially for hilly and mountainous areas with thin covering layers; considering the importance of pile foundations on transmission lines, short piles are the most important The design includes the design of the compression bearing capacity and the up...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/12E02D27/42G06F17/50
CPCE02D27/12E02D27/42
Inventor 吴勤斌陆洲陈允清陈孝湘张礼朝吴征杨巡莺翁兰溪叶琦棽吴培贵李宏进池金明林晗
Owner POWERCHINA FUJIAN ELECTRIC POWER SURVEY & DESIGN INST CO LTD
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