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

Abstract

A coarse-grained saline soil embankment structure design method based on uplift deformation control is used to scientifically and rationally design the structure of a high-speed railway or a maglev coarse-grained saline soil embankment, and can be adapted to actual engineering needs. It includes the following steps: ① Determine the allowable uplift of the top surface of the embankment; ② Preliminarily determine the structure of the coarse-grained saline soil embankment; 0 , calculate and determine the uplift thickness h of coarse grained saline soil in the embankment 0 ; ④ Determine the temperature T of the i-th layer of soil before cooling in winter i1 , the lowest temperature T that occurs in the i-th layer of soil during the cooling period in winter i2 ;⑤ Determine the salt expansion index C of the i-th layer of soil si ; Determine the temperature T i1 down to T i2 The salt expansion force σ of the back i-th layer of soil Ti , temperature T i1 The initial void ratio e of the lower i-th layer of soil 0i , the effective self-weight stress σ of the i-th layer of soil y0i ;6 Calculate and determine the uplift of the top surface of the embankment. ⑦ Determine whether the embankment is satisfied. If it is satisfied, the embankment shall be designed according to the coarse grained saline soil embankment structure initially determined in step ②. Coarse grained saline soil embankment.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for designing a coarse-grained saline soil embankment structure based on uplift deformation control. [0002] technical background [0003] The uplift deformation can easily lead to the cracking of the ballastless track slab of the high-speed railway, causing major ballastless track diseases and even endangering the 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 bulge and deformation. [0004] CN206800076U Chinese utility model patent discloses a high-speed railway embankment reinforcement structure in saline soil area, which is characterized in that the surface layer of the embankment bed is filled with graded gravel that does not contain soluble...

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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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