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Method for determining pile foundation bearing capacity after pile slipping

A bearing capacity and pile foundation technology, which is applied to the determination of the bearing capacity of the pile foundation, can solve the problem that the influence of sliding piles cannot be ignored, and achieve the effects of reducing manpower, easy and reliable parameters to be determined, and accurate calculation results.

Inactive Publication Date: 2014-07-23
TIANJIN UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to a large number of engineering examples in recent years, there is a large deviation between the bearing capacity of the pile foundation after sliding piles evaluated by the above methods and the actual situation, and the impact of sliding piles on the bearing capacity cannot be ignored

Method used

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  • Method for determining pile foundation bearing capacity after pile slipping
  • Method for determining pile foundation bearing capacity after pile slipping
  • Method for determining pile foundation bearing capacity after pile slipping

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Embodiment Construction

[0054] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0055] A method for determining the bearing capacity of a pile foundation after sliding piles, using the following steps:

[0056] 1) Conduct static penetrating penetration test in situ to obtain the initial probe tip resistance q c ′, side friction resistance f s and the pore water pressure u;

[0057] When conducting CPT in-situ testing, the instrument and equipment used is the Wison-APB pile hole CPT system of the survey center. CPT probe cone angle is 60°, cone head area is 10cm 2 , the friction sleeve area is 150cm 2 . The pore pressure sensor is installed 5mm above the shoulder of the probe cone tip, the continuous penetration stroke of each test is 3m, and the penetration speed is 20mm / s. And before each CPT operation, the CPT pr...

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Abstract

The invention discloses a method for determining pile foundation bearing capacity after pile slipping. According to the method, the influences of pile slipping on bearing capacity are taken into consideration, unit side friction is determined in three areas, and CPT in-situ test indexes and related construction data serve as the foundation of calculation. According to the method, the influences of pile slipping on a soil body are taken into consideration, different calculation methods are adopted for the influences of pile slipping on pile foundation bearing capacity, reliable foundation is provided for detecting whether the pile foundation bearing capacity meets the requirement for the load of the upper portion or not after pile slipping, and it can be ensured that the pile foundation upper structure is safe and stable. The method is high in reliability, low in cost and short in cycle, and labor, material and time are greatly saved. The method has the outstanding advantages for oceanographic engineering. The method conforms to the engineering practice and is simple and clear, calculation is easy, related parameters can be easily determined and are reliable, and the calculation result is made more accurate.

Description

technical field [0001] The invention relates to a method for determining the bearing capacity of pile foundations, in particular to a method for determining the bearing capacity of pile foundations after sliding piles. Background technique [0002] Pile foundation is the most commonly used foundation for offshore platforms. In recent years, large-diameter super-long steel pipe piles with a diameter greater than 2m and a penetration depth of more than 90m have been widely used. Due to the complex marine geological environment and large differences in soil layers, it is very common for piles to slide during piling. Rapid pile slides may damage the pile body and cause accidents. After sliding the pile, the soil around the pile changes, which affects the bearing capacity of the pile foundation. There is a certain deviation between the bearing capacity of the pile foundation evaluated by the original method and the actual result. Some scholars have wondered whether the bearing ca...

Claims

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Application Information

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IPC IPC(8): E02D33/00
Inventor 李飒王耀存
Owner TIANJIN UNIV
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