A half-filled and half-dug ecological subgrade structure and construction method

Abstract

The invention relates to a half-filled and half-dug ecological subgrade structure, which is characterized in that a waterproof geotextile and a step-type integral connection network are laid on the interface between the filled subgrade and the excavated subgrade; layer and waterproof geotextile; the excavated subgrade is provided with a long horizontal drainage and ventilation pipe, and the horizontal drainage and ventilation pipe is connected with the vertical ventilation channel near the slope; Lap the side of the fill subgrade with waterproof geotextiles and planting concrete, and excavate side ditches at the bottom of the slope. The invention can effectively discharge the water in the foundation, prevent groundwater from migrating to the roadbed and road surface, effectively prevent frost heaving, thawing and muddying, and can effectively overcome the occurrence of longitudinal cracks at the junction of filling and excavation of the roadbed caused by uneven frost heaving. It has good technical and economic benefits. The invention also discloses a construction method for the half-filled and half-dug ecological subgrade structure.

Description

Technical field [0001] The present invention involves a road -based structure and construction method, and specially involves a semi -filled and half -digging ecological road base structure and construction method.It belongs to the field of highway engineering and is suitable for the construction of roads in hilly areas or mountainous areas. Background technique [0002] Road or mountain road projects often need to be half -filled and half -digging construction. During excavation, the top surface of the road is close to the groundwater level or the road slope is cut off the water -containing layer or the road base is pressed to the spring eyes.Highway slurry is a physical geological phenomenon of highway frost. When frozen and swollen roads are in spring, the middle and upper part of the road base are melted by the lower part of the lower part of the frozen soil, which cannot be penetrated, so that the upper part of the road base soil is in a state of full water.The bearing capac...

AI Technical Summary

Problems solved by technology

However, the patent has the following problems that cannot be solved: (1) The seepage water in the excavation part seeps to the filling roadbed as a whole, but the drainage and ventilation pipes are only arranged at intervals, so the seepage cannot be fully collected in the drainage and ventilation pipes, and the drainage effect is not ideal; (2) The filling In the square subgrade, only a layer of permeable isolation layer is set at the bottom of the subgrade for drainage. The drainage effect is difficult to guarantee when the water cannot seep down quickly, and further drainage measures are required; The transverse reinforcement is set, and the transverse reinforcement will cause local damage to the soil at the junction under the action of the road load

[0005] In summary, although the existing methods have achieved good results under suitable engineering conditions, there are still some areas to be improved.

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