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A Calculation Method of Salt Expansion of Saline Soil Foundation

A technology of saline soil and salt expansion, applied in the field of foundation soil survey, foundation structure engineering, construction, etc., can solve the problem that the foundation self-weight stress and the influence of additional loads cannot be considered, and the difference of salt expansion of soil layers at different depths is not considered, etc. problem, to achieve the effect of convenient measurement method, meet actual engineering needs, and less calculation parameters

Active Publication Date: 2020-04-17
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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  • A Calculation Method of Salt Expansion of Saline Soil Foundation
  • A Calculation Method of Salt Expansion of Saline Soil Foundation
  • A Calculation Method of Salt Expansion of Saline Soil Foundation

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Embodiment

[0032] refer to figure 1 , a saline soil foundation D overlays the additional load of subgrade F, the filling height h of subgrade F is 1.5m, the width of the top surface of subgrade F is 13.4m, and the side-slope ratio of subgrade F is 1:1.5. The saline soil at the bottom of the subgrade F will undergo salt swelling and deformation during the cooling process in winter.

[0033] Below adopt the inventive method to determine the salt swelling amount (the position is the center of the roadbed) that saline soil foundation D produces under the additional load of roadbed F under the winter cooling period, concrete steps are as follows:

[0034] (1) Through on-site investigation, determine the salt expansion deformation calculation depth l of the saline soil foundation D 0 is 3.0m; determine the temperature T of the i-th layer of soil before cooling in winter i1 , unit °C, determine the minimum temperature T of the i-th layer of soil during the winter cooling period i2 , unit ℃, ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D1/02
CPCE02D1/022
Inventor 陈伟志李安洪吴沛沛姚裕春周川滨曾永红胡会星郭在旭张莎莎张健林东升秦谢宇贾坤叶丹
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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