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Construction method and key points of semi-filled and semi-excavated subgrade
Half-filled and half-excavated subgrade cross section is partially excavated and partially filled. The most common form is left-right separation, half-digging and half-filling. At this time, earthwork allocation is often used.

A, half filled and half dug subgrade construction method:

Construction method. Graded macadam transition section is set at the junction of embankment and hard rock cutting. Within 20m of the transition section, bed surface graded macadam is mixed with 5% cement, and bed surface adopts cement stabilized graded macadam (mixed with 5% cement, with a layered thickness of 0. 15cm) for layered filling. A filler transition section is set at the junction of embankment and soft rock, strongly weathered hard rock and soil cutting. The transition section adopts horizontal excavation steps and backfills the same filler as road lifting. The height of the step in the transition section between embankment and cutting is 0.6m, and the horizontal drainage blind pipe is set at the top of the step.

Second, the semi-filled and semi-dug subgrade construction technical regulations:

Building technology. Manually cooperate with machinery to carry out cutting excavation and slope shaping, and build temporary drainage ditch at any time according to the cutting excavation height, clean and shape the subgrade bed and roll it to the design requirements, and then manually excavate the connecting steps. The subgrade bed should be filled and rolled by layers, and each layer should be filled with 4% cross slope as required. After the completion of filling, bed surface construction will be carried out, and then subgrade filling masonry protection and drainage works will be carried out.

Three, half filled and half dug subgrade construction points:

Key points of construction. Impact compaction should be carried out when the bottom of the replacement foundation soil is a soil subgrade, and stability and deformation analysis should be carried out when the soft bottom layer is excavated; After excavation and replacement, the bottom of foundation soil should have a lateral drainage slope of 4% outward; Step joints should be rolled longitudinally along the steps, and small vibrators should be used for construction where large machinery is inconvenient.

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