Analysis of Compaction and Quality Control Measures of Roadbed in Desert Section
In order to ensure the construction quality of desert highways and improve their operational level,the compaction mechanism of desert aeolian sand subgrade was summarized.Taking the S215 line the Sanchakou to Shache Expressway as the research object,compaction standards were formulated,and the filling characteristics of aeolian sand subgrade were studied using particle analysis and compaction tests.It was found that the dry density of aeolian sand reached its peak when the moisture content was low or high,and it had obvious dry and wet compaction characteristics;A calculation model was established using finite element software to calculate the settlement of desert roadbeds under different compaction passes and thicknesses,and the compaction parameters were optimized;At the same time,the quality control measures for desert subgrade were explained from the aspects of compaction preparation(measurement and layout,in-situ surface treatment,paving),compaction method,compaction speed,etc.The compaction quality of the subgrade was tested based on the Portable Falling Weight Deflectometer(PFWD),and it was found that the compaction degree of each measuring point on the subgrade was greater than 96%,which met the specification requirements.This indicates that the compaction and quality control methods for desert subgrade are feasible.
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