Bridge super long large diameter pile foundation bearing capacity test method

A test method and large-diameter technology, applied in the direction of foundation structure test, measuring device, foundation structure engineering, etc., can solve the problems of limited test range, long time and high test cost of anchor pile method, and achieve simple and easy test method , reliable data results and low cost

Inactive Publication Date: 2007-10-24
吉林省交通科学研究所
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Problems solved by technology

[0003] The invention discloses a method for testing the bearing capacity of super long-diameter pile foundations of bridges, which overc

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  • Bridge super long large diameter pile foundation bearing capacity test method
  • Bridge super long large diameter pile foundation bearing capacity test method

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Experimental program
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Effect test

Embodiment 1

[0008] Embodiment 1 Longhua Bridge test pile project is specific as follows with the embodiment of k43+745 pile foundation test:

[0009] Physical and mechanical properties test

[0010] 1. Determination of bulk density

[0011] (1) Determination of soil bulk density

[0012] soil sample

[0013] γ = w v

[0014] In the formula: γ is the bulk density (g / cm 3 ); w is the wet soil weight (grams); v is the volume of the ring knife (cm 3 ).

[0015] Calculations are accurate to 0.01 g / cm 3 . This test was carried out in parallel, and the average value of the two was taken. The experimental record data and results are shown in Table 2-1-1:

[0016] 16-1

[0017] 2. Soil particle size analysis test

[0018] (1) Particle size composition analysis of sandy soil

[0019] The sieving method is used to determine the particle size components of the sand, and the diameters of the sieves used ...

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Abstract

The invention discloses a bearing force test method of bridge ultra-long large-diameter pile, which is a middle shearing test based on Mohr-Clone strength theory to find the pile side friction force, is based on three value methods of normal stresses between pile soils, considers the effect of yield strength of around soils, and calculates out three pile limit bearing forces according to the side stress caused by self weight, normal stress generated by finite element digit calculation, and normal stress generated by coupling weight and finite element. The inventive test has simple operation, without large loading device and limited loading weight, while the invention can drill and sample on site, process indoor test, completely simulate real project geological character of pile ground, and completely consider similarity as similar simulation of real condition, the material, size, and bearing state of test sample, pile and around soil, with low cost, reliable data, or the like.

Description

technical field [0001] The invention discloses a method for testing the bearing capacity of a super long-diameter pile foundation of a bridge, which belongs to the technical field of overall bridge structure construction. Background technique [0002] The field static load test of bridge piles is internationally recognized as the most reliable method to obtain the vertical compression, pullout and horizontal bearing capacity of a single pile. Single pile vertical compression static load test is a test method close to the actual working conditions of vertical compression piles. When the load acts on the top of the pile, displacement (settlement) occurs at the top of the pile, and the Q-S curve of a single test pile can be obtained, and the settlement curve of the top of the pile under each level of load can also be obtained. The ultimate frictional resistance and end bearing force of each soil layer on the side of the pile can be directly measured. The main problems are: th...

Claims

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Application Information

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IPC IPC(8): G01N3/00E02D33/00
Inventor 孙福申佴磊李舰航冷曦晨陈波王心毅辛建营
Owner 吉林省交通科学研究所
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