Method for estimating ultimate bearing capacity of pile-tip-grouted over-length pile

An ultimate bearing capacity and post-grouting technology, applied in the field of geotechnical engineering, can solve the problems of large discreteness of bearing capacity, difficult to estimate accurately, and change of load transfer mechanism of super-long piles, so as to achieve accurate estimation results and simple estimation methods. Effect

Active Publication Date: 2017-11-07
SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The post-grouting piles in Shanghai usually use the ⑦2 and ⑨ layers as the bearing layers of the pile foundation. The post-grouting technology at the pile tip can greatly improve the bearing capacity of a single pile, but the load transfer mechanism of super-long piles has changed significantly. Influenced by factors such as geological conditions, grouting effect, grouting construction management, grouting volume, and grouting pressure, the ultimate bearing capacity of post-grouting ultra-long piles at the pile tip is highly discrete and difficult to accurately predict

Method used

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  • Method for estimating ultimate bearing capacity of pile-tip-grouted over-length pile
  • Method for estimating ultimate bearing capacity of pile-tip-grouted over-length pile
  • Method for estimating ultimate bearing capacity of pile-tip-grouted over-length pile

Examples

Experimental program
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Effect test

Embodiment 2

[0045] [Example 2] On the basis of Example 1, this example combines a specific engineering case (S22 super-long pile of a project in Hongqiao, Shanghai) to estimate the ultimate bearing capacity of the post-grouting super-long pile at the pile end. Specific instructions:

[0046] Such as figure 1 As shown, the total length of the ultra-long pile 1 of a project in Shanghai Hongqiao is 70m, the effective pile length is calculated from the ground, the effective length L=70m, the pile diameter D=0.85m, and the bearing layer at the pile end is the ninth layer of fine sand Coarse sand in the middle, the comparison of bearing capacity before and after grouting at the pile tip image 3 and shown in Table 1 below.

[0047] Table 1: Comparison of pile tip resistance before and after post grouting of ultra-long piles in Example 2

[0048]

[0049] From image 3 And Table 1 shows:

[0050] (1) Non-direct reinforcement section 2 without grout upward return: the scope is the silty c...

Embodiment 3

[0054] [Example 3] On the basis of Example 1, this example combines a specific engineering case (the C1882 super-long pile of a certain project in Shanghai Hongqiao) to estimate the ultimate bearing capacity of the post-grouting super-long pile at the pile end. Specific instructions:

[0055] The pile length of the C1882 ultra-long pile in a project in Shanghai Hongqiao is 50m. The effective pile length is calculated from the ground. Comparison of bearing capacity before and after slurry Figure 4 And as shown in Table 2 below.

[0056] Table 2: Comparison of pile tip resistance before and after post grouting of ultra-long piles in Example 3

[0057]

[0058] From Figure 4 And Table 2 shows:

[0059] (1) Non-direct reinforcement section 2 without grout upward return: the scope is the silty clay layer of ⑤1b and above with a buried depth of more than 22m, mainly silty clay and silty clay, and the length is about 2 / 5L. After grouting, the side friction resistance increa...

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Abstract

The invention discloses a method for estimating ultimate bearing capacity of a pile-tip-grouted over-length pile. According to the method, by overall tip resistance adjustment coefficients, ultimate side friction adjusting coefficients of an indirect reinforcing section of the over-length pile and ultimate side friction adjusting coefficients of a direct reinforcing section of the over-length pile, estimation of upright ultimate bearing capacity of a single pile-tip-grouted over-length pile can be realized. The method can be used for estimating the ultimate bearing capacity of the pile-tip-grouted over-length pile, is simple and accurate in estimation result, and has certain guiding significance for optimization design and engineering practice of the over-length pile.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a method for estimating the ultimate bearing capacity of super-long piles after post-grouting at pile ends. Background technique [0002] With the acceleration of economic development and urbanization, the pile foundation bears more and more loads in the construction of super high-rise buildings and long-span bridges in the soft soil area of ​​Shanghai where the land is increasingly tight, and the settlement control is becoming more and more strict. The application of grouting ultra-long piles is becoming more and more extensive. [0003] The post-grouting piles in Shanghai usually use the ⑦2 and ⑨ layers as the bearing layers of the pile foundation. The post-grouting technology at the pile tip can greatly improve the bearing capacity of a single pile, but the load transfer mechanism of super-long piles has changed significantly. Influenced by factor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/06
Inventor 顾国荣陈晖李韬宣霖康刘波
Owner SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
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