Ecological protection method for sand-filling road foundation hollow block

Abstract

The invention discloses a side slope protection method for sand-filled road bed. The method comprises the following steps: performing drainage treatment of the base of slope, anchoring according to the slope rate of the roadbed side slope, wrapping sand in woven bag, stacking on the slope, back-filling, artificially compacting, finishing the slope, paving pre-cast concrete hollow block with settlement joints in the gaps, packing oakum or pitch in the joints, filling earth in the hollow portions, artificially compacting and leveling, and coating turf covers. The invention has the advantages that the invention successfully overcomes the stability problem of side slope of sand-filled road bed, and can efficiently prevent the collapse of outside clay during the construction on the sand-filled road bed and the damage of shallow layer caused by compaction failure of the sand-filled road bed; the invention can efficiently drain the water accumulated on the foundation of sand-filled road bed and simultaneously prevent the loss of sand particles; the field construction is more convenient; the production scale is flexible; the whole slope is orderly, stable and beautiful; the erosion resistance of side slope is improved; and the drainage capacity of the protective surface is improved.

Description

technical field [0001] The invention relates to a roadbed side slope protection method, in particular to an ecological protection method for a sand-filled roadbed hollow block. Background technique [0002] The construction of high-grade highways in alluvial plain areas or areas with dense water networks often faces the problem of lack of high-quality filler for roadbeds. Borrowing soil from the site not only occupies a large amount of cultivated land, but also makes it difficult to guarantee the quality of the filler; long-distance soil transportation will cause a substantial increase in construction costs. On the other hand, many regions in my country have relatively rich river (river) sand resources. Taking Jiangxi Province as an example, most of the expressways are distributed along the banks of Ganjiang River and Fuhe River. If river (river) sand is used as embankment filler, not only the source of material is rich and the material is convenient to take, but also it ca...

AI Technical Summary

Problems solved by technology

The subgrade filling material designed for the sand-filled subgrade is river sand, which is not easy to compact and has poor cohesiveness. Under the action of the road surface load and its own gravity, it will generate an outward thrust on the outer edge soil, endangering the stability of the slope.

(2) The edge-wrapping soil is not compact: in the past, during the filling process of the embankment, the outer side slope was not easy to construct, and its compactness was difficult to meet the requirements of the design and specifications, and it was relatively loose.

In the process of filling and using the sand-filled subgrade, if the surrounding soil is not dense but loose or collapses, the sand filling inside the subgrade will collapse together with the surrounding soil under the action of the road surface load and its own gravity, causing the entire The subsidence of the road surface is more harmful

(3) The internal drainage of the subgrade is not smooth: because the sand in the sand-filled subgrade needs to have a certain water content to achieve compactness, it will inevitably cause water accumulation at the base of the subgrade. If the water is not discharged in time, the base will be soaked for a long time, causing the base to soften, or Due to the water pressure difference inside and outside the slope, the toe of the slope is eroded, causing the slope to collapse, destroying the stability of the roadbed, causing the roadbed to collapse and the road surface to collapse

[0006] Traditional roadbed slope engineering protection technologies such as cast-in-place concrete, asphalt concrete, masonry rubble, riprap, marl, etc. can also be used as the anti-erosion protection surface for sand-filled roadbed slopes, but they all have the following fatal problems Defects: (1) The overall cost is high (a lot of materials, labor costs, and maintenance costs are high); (2) It is not easy to plant grass and green; (3) Poor durability, poor adaptability to small-scale deformation of channels, and bad encounters Local damage or structural instability are prone to occur when the soil quality, subsidence, expansive soil, embankment subsidence, icing uplift or water uplift pressure; (4) Once the rigid lining surface is partially damaged, it is prone to large-scale damage, which is easy to cause Erosion of the underlying soil, because the wide broken slabs are easily removed under the action of water flow; (5) The repair of the rigid lining is more expensive and the construction is inconvenient

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