Design method of high-speed railway saline soil embankment partition based on salt-frost heave double control

Abstract

Design method of high-speed railway saline soil embankment partition based on salt-frost-heave dual control to scientifically and reasonably determine the design of high-speed railway saline soil subgrade bed partition, and it is convenient to implement, the process is clear, and it can be well adapted to the actual situation engineering construction needs. It includes the following steps: through in-situ monitoring on site, determine the temperature difference Δt at different depths h below the top surface of the saline soil embankment with a duration of not less than 1 year, and draw a Δt-h diagram; take Δt in the Δt-h diagram = [ΔT] The corresponding depth is taken as the depth ht of the environmental temperature sensitive layer of the saline soil subgrade; through the salt expansion test of saline soil, determine the salt expansion force F at different depths h below the top surface of the subgrade, and draw the F-h diagram; take the F-h diagram The depth corresponding to F=W is taken as the critical equilibrium depth of salt swelling force hF; determine the minimum setting depth [h] of the high-speed railway coarse-grained saline soil embankment barrier; combined with the structural design of the high-speed railway subgrade bed in the saline soil area, finally determine the high-speed The reasonable embedment depth h of the railway saline soil subgrade isolation layer.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a design method for a high-speed railway saline soil embankment partition layer. Background technique [0002] Saline soil has the characteristics of salt heaving and subsidence, and there is also the risk of frost heave. Therefore, when building high-speed railways in saline soil areas, the current regulations require that saline soil cannot be used as roadbed filler, resulting in the construction of high-speed railways in saline soil areas. The packing problem is very prominent. [0003] After scientific research, when the content of fine particles and soluble salts are well controlled, coarse-grained saline soil can be used as filling material for high-speed railway roadbeds, but the roadbed structure needs to be improved, and the design of the partition layer also needs to be improved. The reasonable setting depth of the fault layer affects the migration pat...

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Problems solved by technology

[0004] At present, the "Code for the Design of Special Railway Subgrades" stipulates the soluble salt content of saline soil subgrade fillers, and briefly stipulates the applicable conditions for the partition layer. At present, the design of the partition layer position mostly depends on experience, and there is no clear salt for high-speed railways. Correlative Design Theory of Interruption Layer of Soil-stained Subgrade

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