Non-explosion excavation construction method for upper-soft lower-hard stratum pilot tunnel

The invention discloses a pilot tunnel non-explosion excavation construction method for an upper-soft and lower-hard stratum. The technical problems that in the pilot tunnel non-explosion excavation construction technology, the excavation progress is slow, and the over-excavation and under-excavation control difficulty is large are solved. The method comprises the following steps: S1, advanced geological exploration; s2, forepoling; s3, excavating and supporting a soil layer; s4, overbreak and underbreak of the control hole; s5, rock stratum excavation and supporting; s6, closing the inverted arch; according to the construction method, combined construction of various mature devices is fully utilized, all procedures can be closely connected, the construction efficiency is improved, the construction period is shortened, tunnel over-excavation is reduced, the construction cost is reduced, the problems that the upper-soft lower-hard composite stratum construction risk is high, the progress is slow, and the overa