The invention discloses a construction method for
deformation control via the horizontal whirling jet grouting of a long
cantilever in a soft-
rock tunnel. The method comprises the following steps of: (1) drilling on the periphery of a dug outline, carrying out the whirling jet grouting while retreating a
drill stem, and lowering a first profile component after the whirling jet grouting to form a first profile
pile body; (2) repeating the step (1) to construct a first curtain
system; (3) drilling on a tunnel face designed in a tunnel, carrying out the whirling jet grouting while retreating the
drill stem, lowering a second profile component after the whirling jet grouting to form a second profile
pile body; (4) repeating the step (3) to construct a second core earth reinforcing
system; (5) carrying out the mechanical digging and initial supporting on a large section; (6) drilling in the arch
springing position of middle and lower steps obliquely towards the lower direction of the tunnel at 30-45 degrees, lowering a third profile component to form a third profile
pile body; and (7) repeating the step (6) to construct a locking whirling jet grouting pile stabilization
system. According to the construction method, the advanced reinforcement of a horizontal whirling jet grouting pile with a highly strong tunnel outline, the binding and deforming effect of a tunnel face
glass fiber anchor stem, and the anchoring of the locking whirling jet grouting pile are utilized, and the deformation of rock-soil is effectively controlled.