Coarse-grained soil high-filled roadbed drainage structure and construction technique thereof

The invention discloses a coarse-grained soil high-filled roadbed drainage structure and a construction technique thereof. The coarse-grained soil high-filled roadbed drainage structure mainly comprises a roadbed (1), fiber soil (2), a soil blocking wall (3), a drainage device (4), an anti-seepage earthwork cloth (12), an anti-filter earthwork cloth (6), a longitudinal drainage pipe (8) and a reflux valve (9). According to the coarse-grained soil high-filled roadbed drainage structure and the construction technique thereof, a water absorbent fiber material and coarse-grained soil are mixed and stirred to form the fiber soil (2) firstly and jointly filled in the high-filled roadbed (1) within a certain depth range; secondly, the anti-seepage earthwork cloth (12) is laid at the bottom of the fiber soil (2) and connected with the drainage device (4), and a transverse drainage pipe (5) and the drainage device (4) are connected through a rubber ring connector (10); and finally, the soil blocking wall (3) is arranged near a slope toe of a high-filled side slope platform, and rainwater is prevented from seeping in a side slope through the slope toe. The side slope can be prevented from being scoured under rainfall seepage, and accumulated water in the roadbed can be drained out in time; and the drainage effect is good, the compressive strength is high, construction is facilitated, the application range is wide, and the service life of a highway can be effectively prolonged.