CFG pile composite roadbed rubber spacer static load testing device and method

Abstract

The invention provides a CFG pile composite roadbed rubber spacer static load testing device and method. The method comprises the steps that according to the embankment design condition, the punching shear failure angle method is adopted to calculate loads of embankment filling acting on piles and soil between the piles respectively, and pile soil bearing loads and the pile soil stress ratio are obtained; differential settlement of the piles upwards piercing into the spacer amount and differential settlement of the piles upwards piercing into composite foundation pile soil are respectively calculated, the pile piercing amount is comprehensively determined, and according to the table 1, rubber spacers are selected. Arranging is carried out according to the CFG pile composite roadbed rubber spacer static load testing device, and the steps of gradation loading, steady judgment, final load control, data recording and the like are carried out reference to existing specifications and design. According to the device and method, rubber spacers are determined in a mode that load-bearing compression deformation of the rubber spacers is close to the loads, borne by pile bodies, in the actual station, of the upward piercing amount of the spacer amount, a load transfer mechanism of the actual working condition can be simulated, the aim that embankment loads are distributed by the rubber spacers is achieved, and the pile soil stress ratio conforming to the reality can be achieved.

Description

technical field [0001] The invention relates to a technical means for static load testing of geotechnical engineering, in particular to a method and device for testing the bearing capacity of a CFG pile composite foundation for testing embankment load flexible foundations. Background technique [0002] The current static load test method of flexible load composite foundation bearing capacity of embankment mainly refers to the clauses in Appendix B of "Technical Specifications for Building Foundation Treatment" (JGJ79-2012), and there is no special technical specification for the test of subgrade load bearing capacity. The standard (JGJ79-2012) is mainly aimed at the bearing capacity test technology of the rigid foundation of housing construction, and the load transfer laws of the rigid foundation of housing construction and the flexible foundation of embankment are different. The main manifestations are: the difference between the settlement of piles and soil causes the phen...

AI Technical Summary

Problems solved by technology

Therefore, laying a thin sand cushion is difficult to simulate the actual working condition of piles piercing upward into the cushion

If the thickness of the sand cushion is increased, it will be difficult to compact the test site, and loading will also cause the lateral flow of sand particles, which cannot guarantee the stiffness and thickness of the cushion. If the current static load test method is used for embankment load CFG pile composite foundation Static load test will inevitably cause large errors

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