Method for determining upheaval quantity after reinforcing low embankment basement salinized soil pile foundation

Abstract

The invention discloses a method for determining the upheaval quantity after reinforcing a low embankment basement salinized soil pile foundation to determine the upheaval quantity of low embankment basement salinized soil after reinforcing the pile foundation in a scientific and reasonable manner and to be adapted to the actual engineering demand. The method comprises the following steps: determining the neutral point depth 10 of the pile foundation in salinized soil and the atmosphere cooling influence depth 1 below the top surface of the low embankment, and calculating to determine the lowembankment pile foundation upheaval deformation computation thickness h0; determining the temperature Ti1 of the ith-layer soil and other parameters before temperature reduction in winter; carrying out a salt expansion test, a water content test, a specific gravity test of soil particle and a weight test on the soil sample of salinized soil and determining the salt expansion index Csi of the ith-layer soil and other parameters; and determining the upheaval quantity se after reinforcing the low embankment basement salinized soil pile foundation through the formula (refer to the Specification).

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for determining the heave amount of a saline soil pile foundation at a low embankment base after reinforcement. technical background [0002] At present, the amount of salt expansion (i.e. the amount of uplift) of saline soil foundations is mostly determined by the "Building Code for Saline Soil Areas" (SY / T0317—2012), that is, the amount of salt expansion is determined according to the following formula: [0003] S η0 =η·H [0004] In the formula, S η0 is the total salt expansion of the saline soil foundation, in mm; η is the salt expansion coefficient; H is the thickness of the effective salt expansion area, in mm. [0005] The saline soil foundation will bulge and deform under the condition of winter cooling, which can easily lead to cracking of ballastless track slabs of high-speed railways, causing major ballastless track diseases, and even endan...

AI Technical Summary

Problems solved by technology

[0005] The saline soil foundation will bulge and deform under the condition of winter cooling, which will easily cause the ballastless track slab of high-speed railway to crack, cause major ballastless track diseases, and even endanger the driving safety of high-speed trains

Pile foundation reinforcement can effectively control the uplift deformation of saline soil foundation, but there is no feasible method to determine the amount of foundation uplift after pile foundation reinforcement. The influence of pile foundation replacement, pile foundation anchorage, self-gravity of saline soil and low embankment additional load cannot take into account the difference in salt expansion of soil layers at different depths

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