A Design Method of Saline Soil Cutting Subgrade Bed Structure Based on Uplift Deformation Control

Abstract

A design method of saline soil cutting subgrade bed structure based on uplift deformation control to scientifically and rationally design high-speed railway or maglev saline soil cutting subgrade bed structure, and can adapt to actual engineering needs. It includes the following steps: ① determine the allowable uplift of the top surface of the cutting bed; ② preliminarily determine the structure of the saline soil cutting bed; 0 , calculate and determine the calculated thickness h of the uplift of the subgrade bed of saline soil cutting 0 ; ④ Determine the temperature T of the jth layer of soil in the structural layer under the subgrade layer before cooling in winter within the calculated thickness range of the uplift j ⑤Coarse-grain saline soil samples and saline soil foundation soil samples within the range of uplift calculation thickness were collected on site, and salt expansion test, compression rebound test, water content test, soil particle specific gravity test and gravity test were carried out indoors. Test to determine the salt expansion index C of the jth layer soil of the structural layer under the subgrade sj ⑥Calculate and determine the uplift of the top surface of the cutting subgrade bed ⑦Determine whether it is satisfied, if not, repeat the work from step ② to step ⑥ until it is satisfied

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for designing a saline soil cutting foundation bed structure based on uplift deformation control. [0002] technical background [0003] 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 swelling under the condition of winter cooling. When building high-speed railway or magnetic levitation cutting in similar areas, the structural layer of the subgrade bed filled with coarse-grained saline soil and the saline soil foundation at the bottom of the subgrade bed are prone to uplift deformation. [0004] The Chinese utility model patent of CN207130544U discloses the cutting subgrade bed structure of the boat trough partition type ballastless track in the medium-strong s...

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Problems solved by technology

However, this patent has not yet provided a method for determining the uplift deformation of the top surface of the cutting subgrade, and there is no design basis for determining the thickness of the upper structural layer of the subgrade bed and the lower structural layer of the subgrade bed. At present, there are no relevant specifications, documents or patents to provide it. and

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