Field test method of influence on vertical bearing capacity of pile foundation by horizontal cyclic load

Abstract

The invention discloses a field test method of influence on vertical bearing capacity of a pile foundation by a horizontal cyclic load. The method eliminates influence on test results by the foundation soil plastic deformation to the greatest extent through such methods as high-compressibility cushion layers at the bottoms of test piles and vertical cyclic loading; when the vertical displacement of a test pile foundation meets requirements, a final vertical loading test result is used as a reference parameter; then, a horizontal load is applied to the upper parts of the test piles for circulation according to the requirements; then, according to code requirements, the vertical loading is performed, and each stage of test data is recorded; and finally, twice vertical loading test pile testing results before and after horizontal loading are compared to calculate the influence on the vertical bearing capacity of the pile foundation by the horizontal cyclic load. The method particularly can effectively guide design and construction of such large engineering pile foundations as bridges and wharfs for such special geologies as coral reefs and diatomaceous earth in Southeast Asia, and ishigher in reference value.

Description

technical field [0001] The invention relates to a method for testing the bearing capacity of pile foundations, in particular to a method for testing the influence of horizontal cyclic loads on the vertical bearing capacity of pile foundations. Background technique [0002] Compared with the construction conditions of domestic large-scale infrastructure, the conditions faced by South Asian countries are even harsher, which brings huge challenges to infrastructure construction. From the technical level, it is mainly divided into two aspects: first, the area is dominated by special geology such as coral reef geology or diatomite, while the domestic geology is mainly dominated by clay, sand or rock. There is a big difference in the structure and the mechanical characteristics of the foundation; second, the region is close to the Indian Ocean, and the hydrometeorological conditions are extremely complex, especially the influence of medium and long-term waves, which brings uncerta...

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Problems solved by technology

From the technical level, it is mainly divided into two aspects: first, the area is dominated by special geology such as coral reef geology or diatomite, while the domestic geology is mainly dominated by clay, sand or rock. There are large differences in the structural and foundation mechanical characteristics; second, the region is close to the Indian Ocean, and the hydrometeorological conditions are extremely complex, especially the influence of medium and long-period waves, which brings uncertainty to the construction of the project

However, the relevant domestic technical specifications are no longer suitable for the complex construction conditions in South Asia. Therefore, in th

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