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Ultimate uplift capacity standard value calculation method for uplift short piles with enlarged bottom

A technology of ultimate bearing capacity and uplift bearing capacity, applied in the field of uplift pile foundations, which can solve the problem that the standard value of the ultimate bearing capacity of uplift does not conform to the actual situation.

Active Publication Date: 2018-05-15
POWERCHINA HEBEI ELECTRIC POWER SURVEY & DESIGN INST CO LTD
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Problems solved by technology

[0005] (2) Based on the second failure mode of bottom-enlarging uplift short piles in the code, the deduced standard value of the ultimate uplift bearing capacity is also unrealistic

Method used

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  • Ultimate uplift capacity standard value calculation method for uplift short piles with enlarged bottom
  • Ultimate uplift capacity standard value calculation method for uplift short piles with enlarged bottom
  • Ultimate uplift capacity standard value calculation method for uplift short piles with enlarged bottom

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Embodiment Construction

[0078] Below in conjunction with embodiment the present invention is described in further detail:

[0079] A method for calculating the standard value of the standard value of the uplift ultimate bearing capacity of a bottom-expanded uplift short pile, comprising the following steps:

[0080] a. When the buried depth of the foundation is greater than the critical depth of uplift (that is, the second failure mode of the short pile in the "Technical Regulations for the Design of Foundations of Overhead Transmission Lines"), determine the second failure mode of the bottom-expanded uplift short pile, and analyze the sliding The shape of the fracture surface and the composition of the pull-out bearing capacity;

[0081] According to the field test results and finite element analysis results, the second failure mode of the bottom-enlarged uplift short pile, that is, when the buried depth of uplift is greater than the critical depth of uplift is as follows: Figure 5 as shown, Fig...

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Abstract

The invention discloses an ultimate uplift capacity standard value calculation method for uplift short piles with enlarged bottom, and belongs to the field of uplift pile foundation. The method comprises the steps that 1, a second destruction mode of uplift short piles with enlarged bottom is determined when a foundation depth is greater than an uplift critical depth, and the shape of a sliding rupture surface and the composition of uplift capacity are analyzed; 2, calculation shear plane of the ultimate uplift capacity of soil is established; 3, a stress state equation of the sliding rupturesurface in an uplift limit equilibrium state of uplift piles with enlarged bottom is deduced according to the theory of sliding line and the Mohr-Coulomb yield criterion; 4, an ultimate uplift capacity standard value formula for an uplift pile foundation with enlarged bottom is deduced. According to the method, an uplift destruction mode of the uplift short piles with the enlarged bottom is clarified, and the ultimate uplift capacity standard value calculation method for the uplift short piles with enlarged bottom is deduced theoretically.

Description

technical field [0001] The invention relates to the field of uplift pile foundations, in particular to a calculation method for a standard value of the ultimate bearing capacity of an uplift pile. Background technique [0002] The "Technical Regulations for Foundation Design of Overhead Transmission Lines" (DL / T 5219-2014) stipulates that the calculation of the stability of the foundation is based on the shear method. When the uplift buried depth of the foundation is less than or equal to the critical depth of uplift, the failure mode of the foundation uplift is as follows: figure 1 Shown (the first failure mode of the short pile); when the uplifting depth of the foundation is greater than the critical depth of uplifting, the failure mode of the foundation uplifting is as follows figure 2 Shown (the second failure mode of short piles). According to the following failure mode of the uplifting short pile with enlarged bottom and uplift resistance, the formula for calculatin...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 赵怀宇
Owner POWERCHINA HEBEI ELECTRIC POWER SURVEY & DESIGN INST CO LTD
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