Study On The Trial Of Highway Reinforcing Agent To Strengthen Fine-grained Soil In Xinjiang Oasis

With the development of tourism in Xinjiang,the construction of highway is an important carrier to drive the local economy.However,the oasis area in Xinjiang is lack of gravel materials,and the long transportation distance will increase the cost of highway construction;At the same time,excavation works can not be avoided in the process of highway construction.If the existing spoil is not properly disposed,it will affect the ecological environment around the highway;In view of this situation,according to the characteristics of fine-grained soil in oasis area of Xinjiang,this paper selects the appropriate dosage of F1 reinforcement agent,studies its mechanical properties after it is mixed into the soil according to different mixing proportion,and makes a comparative analysis with the soil not mixed with F1 reinforcement agent,so as to determine the best dosage of reinforcement agent;And carry out durability test to study the road performance of the soil reinforcement agent,the specific research content is as follows:(1)Taking the silt,silty sand and sandy soil with different salt content in the construction section of S21 Altay Huanghuagou bid section 3 as raw materials,the undisturbed soil was named through the basic tests such as screening,soluble salt and limiting moisture content.Through the detection test of soluble salt,it is confirmed that F1 reinforcement agent has chemical reaction with chloride ion,and can effectively limit the free movement of chloride ion in soil.Through the compaction test,the best water content of silt,sand and silty sand used in this paper is 21.7%,8.1% and 5.6%respectively,and the maximum dry density is 1.62g/cm~3、1.81 g/cm~3、2.24 g/cm~3.(2)The reinforcing mechanism of F1 ionic organic reinforcing agent in soil was analyzed;Through the California bearing ratio,unconfined compressive strength and dynamic triaxial dynamic modulus of resilience test,the strength difference change law is obtained,and the reinforcement technology results of unreinforced silt,sand and silty sand with different salt content and reinforced silt,sand and silty sand with different salt content are compared,The best dosage of F1 reinforcing agent is 4L / m ~3.(3)Through the freeze-thaw test,dry wet cycle test,temperature shrinkage test and dry shrinkage test,the road performance of the soil reinforced by F1 reinforcement agent was studied.When the number of freeze-thaw cycles reaches 17,the loss rate of uniaxial compressive strength is 17.83%;When the number of freeze-thaw cycles reaches 25,the mass loss is 0.8889 kg.When the number of dry wet cycles exceeds 6 or more,the loss rate of uniaxial compressive strength is 54.84%.The dry shrinkage of soil without F1 reinforcement agent is 0.2901 kg,and that of soil with F1 reinforcement agent is 0.1382 kg.Therefore,F1 reinforcement agent is recommended as the road construction material of rural highway subgrade in Xinjiang.In this paper,the reinforcement technology of silt,silty sand and sandy soil with different salt content in Xinjiang is systematically studied by adding organic reinforcement agent alone.The research results can be used as a reference for the construction of rural roads in Xinjiang,and also provide a reference for the prevention of highway diseases in saline soil.