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Calculation method for effective soil layer deformation moduli of pile ends and calculation method for settlement of pile group

A technology of deformation modulus and calculation method, which is applied in the direction of foundation structure test, construction, foundation structure engineering, etc., can solve the problems such as the complexity of the soil layer, the large gap between calculation and reality, and achieve accurate settlement of pile groups, The effect of accurate deformation modulus of effective soil layer

Active Publication Date: 2017-05-31
GUANGDONG RES INST OF WATER RESOURCES & HYDROPOWER
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Problems solved by technology

The empirical coefficient in the national code is corrected for these two reasons, but due to the complexity of the soil layer, there is sometimes a large gap between the calculation and the actual

Method used

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  • Calculation method for effective soil layer deformation moduli of pile ends and calculation method for settlement of pile group
  • Calculation method for effective soil layer deformation moduli of pile ends and calculation method for settlement of pile group
  • Calculation method for effective soil layer deformation moduli of pile ends and calculation method for settlement of pile group

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Experimental program
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Embodiment 1

[0085] This embodiment provides a method for calculating the deformation modulus of the soil layer and a method for calculating the settlement of pile groups based on a single pile load test.

[0086] A full-scale test of a group of pile groups located in Jiangning District, Nanjing. In this test, there are 9 piles in the pile group, and the 9 piles are arranged in a 3×3 square. The foundation of the pile group is a square of 2.8m×2.8m, the pile length l=20m, the pile diameter is 0.4m, and the pile spacing is s a = 1m, the modulus of elasticity of the pile body concrete is E p =29.2GPa, the average Poisson's ratio of the soil layer is ν=0.45, ω=0.79. figure 1 is the floor plan of the pile group, figure 2 is a cross-sectional view of the pile group.

[0087] The geological conditions of the soil layer are shown in Table 1:

[0088] Table 1 Geological situation table of soil layer

[0089]

[0090] According to the pressure calculation formula The load condition of th...

Embodiment 2

[0125] In this embodiment, the effective soil deformation modulus data of the pile end obtained in embodiment 1 MPa is brought into the calculation method in the "Technical Specifications for Building Pile Foundations", and then the settlement of the pile group is calculated. The settlement results are shown in Table 11. Since the calculation methods in the "Technical Specifications for Building Pile Foundations" are well known to those skilled in the art, they will not be repeated here.

[0126] The pile group settlement calculated in table 13 embodiment 2

[0127]

[0128] The respective pile group settlement calculation results of Embodiment 1, embodiment 2 and standard "Building Pile Foundation Technical Specifications" and the settlement of actual measurement are plotted in Figure 4 middle. From Figure 4 It can be seen that the pile group settlements calculated in embodiment 1 and embodiment 2 are close to the actual measured pile group settlements, and the pile ...

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Abstract

The invention relates to a calculation method for effective soil layer deformation moduli of pile ends. The calculation method for the effective soil layer deformation moduli of the pile ends comprises the following steps that (1) a field test is conducted in each pile, so that the corresponding relation (N, S) between single pile loads N and single pile settlement S is obtained; and (2) the effective soil layer deformation moduli (please see the specification for the symbol) of the pile ends are calculated according to the corresponding relation (N, S) between single pile loads N and single pile settlement S. According to the calculation method for the effective soil layer deformation moduli of the pile ends, original soil layer deformation moduli are obtained through inversion according to settlement data of the field single-pile load test, the conditions such as the in-situ original structure of an actual soil layer can be directly reflected, and the defect of large errors of soil layer compression moduli obtained through an indoor geotechnical test in 'technical code for building pile foundation' is overcome.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a calculation method of the effective soil layer deformation modulus at the pile end and the settlement amount of pile groups. Background technique [0002] The bearing capacity and settlement of pile foundation are the most important contents in pile foundation design. In order to accurately calculate and predict the settlement of pile foundations, relevant technical personnel have conducted a lot of research and proposed a series of methods for calculating settlement. However, due to the complexity of the underground pile foundation and the non-uniformity of the foundation soil layer, the calculation theory of pile foundation settlement needs to be perfected. [0003] The current "Technical Specifications for Building Pile Foundations" (JGJ94-2008) uses the equivalent effect layered sum method to calculate the settlement. The equivalent action surface is located at the low pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 杨光华陈富强李志云张玉成乔有梁姜燕
Owner GUANGDONG RES INST OF WATER RESOURCES & HYDROPOWER
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