Numerical Analysis of Horizontal Bearing Behavior of Helix Stiffened Cement Mixing Pile

Abstract Helix Stiffened Cement Mixing Pile (HSCMP) is a rigid composite pile type that combines rigid screw piles and flexible cement‐soil piles to form complementary reinforcements. Aiming at the horizontal bearing performance of HSCMP, a numerical analysis model was established, and parametric analysis was carried out to study the ratio of cement‐soil unconfined compressive strength to the undrained shear strength of soil around the pile ( q u /s u ), the blade diameter to the pile diameter ratio of the screw pile ( D/d ) Effects on the horizontal load‐displacement curve, pile displacement, and pile bending moment of HSCMP. The results show that the pile displacement and bending moment of HSCMP gradually decrease with the increase of q u /s u and D/d ; the horizontal ultimate bearing capacity of HSCMP increases linearly and then tends to be stable with the increase of q u /s u . It increases approximately linearly with the increase of D / d , the HSCMP normalized horizontal ultimate bearing capacity correction calculation formula is proposed.