Non-closed arc-shaped secant pile foundation pit supporting structure for mountainous complex topography and geology

The utility model discloses a non-closed type arc-shaped secant pile foundation pit supporting structure for mountainous area complex terrain geology. The non-closed type arc-shaped secant pile foundation pit supporting structure comprises secant piles, skewback corner piles, skewbacks and a crown beam. The foundation pit structure is mainly characterized in that a row of secant piles formed by alternating reinforced concrete and plain concrete are arranged on a supporting face along the arch axis, arch-shaped connecting top beams are arranged on the tops of the secant piles, the bottoms of the piles are embedded into the bottom of a foundation pit by a certain depth, and a plurality of reinforced concrete piles with large diameters are intensively arranged at the end of the arch axis to form an arch support; an arch-shaped secant pile and a top beam form a whole to serve as a pile rear soil body supporting structure, due to the fact that a non-closed supporting system is adopted, axial force transmitted to a