Abstract: According to the situations of urgent construction period and difficult transportation in transmission line engineering, the field uplift behavior tests on assembly foundation of steel structure were carried out in hard backfill clay. The loading-displacement curves were obtained, and the stress-strain relationship in steel components and the earth pressure variation changes were investigated. This paper presented the important data for the theory of capacity calculating, design method and engineering applications of this kind of foundations in transmission line engineering.

Key words: transmission lines, steel structure, assembly foundation, ultimate uplift capacity