Due to some problems such as difficulty in reserving pipe jacking construction holes

the inclination of open caisson and the insufficient bearing capacity of the support structure in the traditional support structure during pipe jacking construction

the efficiency and safety of pipe jacking construction will be seriously affected. To address these problems

a new type of profile steel- polymer composite fabricated support structure suitable for pipe jacking work shaft is developed. Through the combination of actual engineering field test and finite element numerical simulation

the soil settlement deformation around the work shaft and the mechanical response of the support structure during pipe jacking construction are analyzed

and the reliability of the new support structure for pipe jacking construction is verified. Finally

the main controlling factors affecting the mechanical properties of the support structure of the work shaft are obtained through an orthogonal simulation test. The results show that the spacing of support piles is the main controlling factor affecting the mechanical properties of the new support structure

and in the process of short-distance pipe jacking

the soil around the work shaft has different degrees of settlement

and the surface settlement in the jacking direction is the largest

and the surface settlement in the sidewall direction is the smallest

and the influence range on the surface settlement is about 2.7 times of the jacking distance. Moreover

the stress of supporting pile increases with the increase of pipe-soil interface friction

and the stress of supporting pile at the entrance is the largest. In the long-distance pipe jacking construction

the stress of the jacking surface is large in the early stage of pipe jacking. With the increase of the jacking distance

the stress of the sidewall and back wall increases

which is higher than that of the jacking surface. The research results can provide favorable suggestions for the optimal design of a new support structure of pipe jacking work shaft.