The G248 Dalingshan Xincheng second-class highway is located in the east of Gannan Tibetan Autonomous Prefecture,with a high altitude and low winter temperature.It is a seasonally frozen area.When constructing highways in seasonal frozen areas,the first thing to consider is the frost heave effect,which can cause diseases such as frost heave,swelling,and bulging on the highways.Therefore,suitable filling materials should be selected before construction,and drainage facilities should be installed to avoid frequent mainte-nance and upkeep after opening to traffic.
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