A Calculation Method of Salt Expansion of Saline Soil Foundation

Abstract

The invention provides a method for measuring the salt expansion of saline soil foundation. The method for measuring the salt expansion of the saline soil foundation can determine the salt expansion of the saline soil foundation in a winter temperature reduction period scientifically and reasonably, and can meet practical engineering requirements. The method for measuring the salt expansion of thesaline soil foundation comprises the following steps that through field investigation or data query, the salt expansion deformation calculating depth l<0> of the saline soil foundation, the temperature T<i1> of an I layer of soil before winter temperature reduction and the lowest temperature T<i2> of the I layer of the soil during winter temperature reduction period are determined; soil samples of saline soil are collected on site, and a salt expansion test, a moisture content test, a soil particle specific gravity test and a gravity test are carried out indoors, the salt expansion index C<si> of the I layer of the soil, the salt expansion force sigma<Ti> of the I layer of the soil after the temperature drops from T<i1> to T<i2>, the initial void ratio e<0i> of the I layer of the soil at the temperature of T<i1> and the effective self-weight stress sigma<y0i> are determined; and the salt expansion of the saline soil foundation is determined through the following formula, and please see the specification for the formula.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for measuring and calculating the amount of salt expansion of saline soil foundation. [0002] technical background [0003] The salt swelling deformation of the saline soil foundation can easily cause the building to bulge upwards, cause the building to deform or crack, and affect the normal function of the building. At present, the salt expansion of saline soil foundation is mostly determined by the "Building Code for Saline Soil Areas" (SY / T0317-2012), that is, the salt expansion is determined according to the following formula: [0004] S η0 =η·H [0005] 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. [0006] The above calculation formula is based on the salt expansion coefficient to determine the salt expan...

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Problems solved by technology

[0006] The above calculation formula is based on the salt expansion coefficient to determine the salt expansion amount of the saline soil foundation. Its technical deficiency is that it cannot consider the influence of the foundation's self-weight stress and additional load, and does not consider the difference in salt expansion of soil layers at different depths.

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