Experimental Study On Frost Heave Of Railway Subgrade By Salt Injection In Qinghai Lake Area

Roadbed frost heave is a common disease in seasonal frozen soil.This paper analyzes the main factors that affect the frost heave disease of the roadbed.Based on the previous experience of freezing the roadbed of the railway subgrade,this paper puts forward the idea of using the buried pipe salt injection method to study the impact of the railway roadbed on the roadbed in the Qinghai-Tibet line.Remediation of railway roadbed frost damage.In this paper,field test and laboratory test were used to study the frost damage of subgrade in the Qinghai-Tibet Railway in the Qinghai-Tibet Railway,and the drilling and sampling of the typical section railway subgrade were carried out.According to the climate of the Qinghai-Change the situation,in the field test site soil samples in the room for frost heave test.The main contents of this paper are as follows:Firstly,based on the remediation method of the railway roadbed in the Qinghai Lake area,the drilling and sampling of the typical frostbite site were carried out,and the soil engineering test was carried out to analyze the main factors causing the frost heave.Secondly,according to the experience and effect of remediation of frost heave disease in the past,the typical frost heave disease segment was selected and the remediation of the scaffolding disease of the railway subgrade was carried out by field buried salt injection method.Thirdly,according to the climate change in the Qinghai Lake area,the temperature change was simulated in the indoor low temperature model box,and the freezing and thawing cycle was carried out to study the effect of the salt injection amount on the frost heave amount.,To verify the feasibility and effectiveness of salt injection control of railway subgrade disease.The study show that the salt-thawing method has a good control effect on the freezing and tearing disease of railway subgrade,which is an effective measure to prevent and destroy the railway roadbed.