A structural design method of coarse-grained saline soil embankment based on uplift deformation control

Abstract

A structural design method of coarse-grained saline soil embankment based on uplift deformation control is proposed to scientifically and reasonably design the structure of high-speed railway or magnetic suspension coarse-grained saline soil embankment, which can meet the needs of practical engineering. The method comprises the following steps of: 1 determining the allowable uplift amount of the top surface of the embankment; 2 preliminary determination of embankment structure of coarse-grained saline soil; 3 determining the influence depth of saline heaving atmosphere of coarse-grained salinesoil embankment, calculating and determining the calculated thickness of coarse-grained saline soil uplift in embankment; 4 determining the temperature Ti 1 of the i-layer soil before cooling in winter and the lowest temperature Ti 2 appearing in the i-layer soil during cooling in winter; 5 determining the salt dilatancy index Csi of the i-layer soil, the salt swelling force sigma Ti, the initialvoid ratio e0i and the effective self-weight stress sigma y0i of the i-layer soil were determined when the temperature Ti 1 decreased to Ti 2; 6. calculating and determining the amount of embankmenttop surface uplift; 7. Performing judging, if yes, the embankment shall follow the steps 2, the structure of coarse-grained saline soil embankment being designed, If not, repeating steps 2 to 6, untilthe judging result is yes, to design a reasonable embankment for coarse-grained saline soil.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for designing a coarse-grain saline soil embankment structure based on uplift deformation control. technical background [0002] Uplift deformation can easily lead to cracking of ballastless track slabs of high-speed railways, causing major ballastless track defects, and even endangering the driving safety of high-speed trains. Saline soil has the characteristics of salt expansion under the condition of cooling in winter. When high-speed railway or maglev embankment is filled with coarse-grained saline soil, the top surface of the embankment is prone to uplift and deformation. [0003] The Chinese utility model patent CN206800076U discloses a high-speed railway embankment reinforcement structure in a saline soil area, which is characterized in that the surface layer of the embankment bed is filled with graded crushed stones that do not contain soluble sa...

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Problems solved by technology

However, this patent does not provide a method for determining the uplift deformation of the top surface of the embankment. The determination of the thickness of the structural layer above the base layer and the structural layer below the base layer is also arbitrary, lacking a corresponding theoretical basis, and currently there are no relevant specifications, Literature or patents are mentioned

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