A zero-fill black cotton soil subgrade treatment method

Abstract

The invention provides a zero-filling black cotton soil subgrade treatment method. The method comprises the following steps: step 1: excavating a subgrade: excavating black cotton soil with the depth being 80cm in a subgrade range; compacting and flattening the subgrade; step 2: after forming stable cracks on the bottom surface and the side face of a groove to be excavated, spraying a black cotton soil treatment curing agent; step 3: paving two layers of the black cotton soil treated by the black cotton soil treatment curing agent and having the thickness being 50cm, wherein the compaction degree is required to be not lower than 95% and the surface flatness does not exceed + / -5cm after the black cotton soil is compacted; step 4: paving 30cm of gravelly soil: paving and grinding the gravelly soil for one time, wherein the compaction degree is not lower than 95% and the surface flatness does not exceed + / -5cm after the black cotton soil is compacted; and step 5: building a gravel blind ditch and an edge ditch: arranging the gravel blind ditch at the lower part of the edge ditch. According to the method provided by the invention, an excavating surface is reinforced by spraying the black cotton soil treatment curing agent on the ground and the side face of an excavating pit slot of the black cotton soil subgrade; the refilling of the black cotton soil treated by the curing agent realizes the utilization of black cotton soil wastes; and the aims that the structure is stable and the environment is protected are realized.

Description

technical field [0001] The invention relates to a treatment technology for black cotton soil zero-fill roadbed treatment using a black cotton soil treatment curing agent and crushed stone blind ditch. Background technique [0002] The zero-fill or low-fill embankment in the black cotton soil area is the hardest hit area where subgrade and pavement cracks occur. Because the terrain is very flat, after over-excavation and replacement of the original surface, an artificial subgrade base water catchment area is actually formed. However, due to the flat topography, surface water seepage, capillary water, and even possible interlayer water cannot be ruled out in this water catchment area. The base of the subgrade is soaked in water for a long time, and the black cotton soil expands and deforms. After the rainy season, due to the failure to take effective water retention measures during construction, the base of the black cotton soil loses water, shrinks and cracks, and reflects to...

AI Technical Summary

Problems solved by technology

LSDBS treats the roadbed structure of black cotton soil and gravel soil replacing black cotton soil, which can not only solve the problem of poor water stability of black cotton soil roadbed, but also use black cotton soil as roadbed backfill soil, which reduces spoil, saves cost and Reduced environmental stress

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