Geological Problem and Engineering Countermeasure for Heibei Highway Expansion Project

The Heibei highway in expansion project is located in Xiaoxing’anling permafrost areas.Its total length is 148 km,and has 17 island permafrost sections.Some sugared above area exists uneven subsidence,which affects road life and the stability of roadbed largely. The main reason for this is seasonal freezing and thawing of soil,resulting in the changes of foundation bearing capacity,and then the roadbed instability.In addition,many weak layers in the sugared area