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Deformation analysis method of expanded-base uplift pile group considering reinforcement effect

A deformation analysis and analysis method technology, applied in design optimization/simulation, geometric CAD, etc., can solve problems such as backward deformation mechanism research

Inactive Publication Date: 2020-07-28
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the relevant academic research on the bottom-enlarged uplift piles, domestic and foreign academic achievements are mainly reflected in the uplift-bearing characteristics of the expanded-bottom uplift piles, but the research on the deformation mechanism is relatively backward

Method used

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  • Deformation analysis method of expanded-base uplift pile group considering reinforcement effect
  • Deformation analysis method of expanded-base uplift pile group considering reinforcement effect
  • Deformation analysis method of expanded-base uplift pile group considering reinforcement effect

Examples

Experimental program
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Effect test

Embodiment 1

[0147] In this example, see Figure 1-Figure 16 , a deformation analysis method of a bottom-expanded uplift pile group considering reinforcement effect, said analysis method comprising the steps of:

[0148] (1) The deformation of the soil around a single uplift pile is idealized as the shear deformation of a thin-walled concentric cylinder, and the bottom-expanded uplift pile body is simplified as an elastic body placed on the central axis of the cylinder, as shown in figure 1 shown;

[0149] The element shear strain at a distance r from the central axis of the cylinder is:

[0150]

[0151] U(r,z) is the vertical deformation of the soil around the pile at the buried depth of z;

[0152] The shear stress τ of the equal-section uplift single pile along the pile body is a variable value; the shear stress τ is related to the radial distance r and the depth z, according to the shear Hooke's law:

[0153]

[0154] G s is the shear deformation modulus of the soil;

[015...

Embodiment 2

[0197] This embodiment is basically the same as Embodiment 1, especially in that:

[0198] In this embodiment, the analytical solution of the deformation analysis method of the bottom-enlarged uplift pile group considering the reinforcement effect is as follows:

[0199] (1) Simplification of the load transfer model of the uplift-expanded bottom pile-soil

[0200] According to the load transfer theory of pile foundation, the load transfer model of the expanded bottom uplift pile-soil is obtained, as follows: Figure 4 As shown; under the action of vertical load, the mechanical characteristics of the expanded bottom uplift pile make the vertical displacement of the expanded diameter body very small. Based on this, the relationship between the expanded bottom uplift pile expanded diameter body and the surrounding soil The load transfer between can be assumed to be a nonlinear spring mode; based on this assumption, Figure 4 can be simplified as Figure 5 shown;

[0201] (2) De...

Embodiment 3

[0271] This embodiment is basically the same as the previous embodiment, and the special features are:

[0272] In this embodiment, this embodiment specifically relates to a deformation analysis method of bottom-expanded uplift-resistant pile group considering the effect of reinforcement. The pile diameter is 600mm, the bottom expansion diameter is 1150mm, and the bottom expansion part is 1m high; the concrete strength grade is C30. The test piles are divided into two groups, A and B, with 7 piles in each group, and the plane layout of the two test piles is the same, as shown in Figure 8 As shown, only three pile tests are considered here, and the test pile parameters are shown in Table 1.

[0273] Table 1 Test pile parameter table

[0274]

[0275] The project is located in Pudong New Area, Shanghai. The physical and mechanical properties of the soil are shown in Table 2.

[0276] Table 2. Main physical and mechanical property indexes of soil layer

[0277]

[0278...

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Abstract

The invention discloses a deformation analysis method of an expanded-base uplift pile group considering a reinforcement effect. The analysis method comprises the following steps: based on an elastic mechanics theory, a pile foundation load transfer principle and a thin-wall concentric cylinder shear deformation model, deducing a deformation nonlinear analytical solution expression of the expanded-base uplift pile group considering a reinforcement effect, and giving out specific calculation steps. The accuracy and effectiveness of the method are proved by comparing the calculation result of theanalytical solution with the suite of the measured data and the finite element simulation result. Calculation results show that the influence of the soil body performance, the pile end expanding bodyand the pile length on the deformation of the reinforced effect expanded-base uplift pile group is remarkable. Along with the increase of the elasticity modulus of the soil body, the increase of thepile end expanding body and the increase of the pile length, the uplift displacement reduction rate of the pile group is increased.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a deformation analysis method of bottom-enlarged uplift-resistant pile groups. Background technique [0002] At present, the relevant academic research on the expansion-bottom uplift piles, the academic achievements at home and abroad are mainly reflected in the uplift-bearing characteristics of the expansion-bottom uplift piles, but the research on the deformation mechanism is relatively backward. In the application of engineering practice, the design and calculation theory of the expansion-bottom uplift pile is still not perfect. The value of the ultimate lateral friction resistance of the uplift pile is obtained by subtracting the factor, and then the calculation formula of the uplift bearing capacity of the uplift pile is obtained. Therefore, the research on the load-bearing behavior and deformation mechanism of the expanded bottom uplift pile ha...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F30/23
Inventor 姚文娟顾毛亮徐赐敏程泽坤肖路
Owner SHANGHAI UNIV
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