Pavement construction with hierarchically completely encapsulated roadbed and construction method thereof

Abstract

The invention provides a pavement construction with a hierarchically completely encapsulated roadbed and a construction method thereof. The pavement construction comprises the roadbed which is of a multi-layer structure; a waterproof roadbed enhancement layer is completely encapsulated on each layer of roadbed in a sealing manner, and the layers are superposed to form the overall roadbed. By adopting the pavement construction, water exchange of a roadbed bearing layer and the outside is blocked up while the bearing capacity and the stability of the roadbed are improved; surface water, roadbed slope ooze water and underground water can be prevented from entering the roadbed bearing layer and the pavement construction to affect the bearing capacity and the stability; moisture content control of a roadbed material also can be ensured while water damage is effectively solved, so that the roadbed normally works under the optimal moisture content in construction control for a long period of time; deterioration of the bearing capacity and the stability and serious differential settlement caused by moisture evaporation loss and heterogeneous migration of the roadbed are avoided; the use and full utilization of local materials in roadbed construction in areas with expansive soil, collapsible soil and the like with strong water sensitivity also can be achieved by virtue of stable control on the moisture content of the roadbed, and excavated spoiling, filling and borrowing of materials and transportation are avoided, so that the construction costs are saved, and energy conservation and environment protection are achieved.

Description

technical field [0001] The invention relates to a pavement structure and a construction method thereof, in particular to a pavement structure with all-inclusive subgrade layers and a construction method thereof. Background technique [0002] In the fields of various roads, airport runways, and municipal facilities, the service life of the road surface is a key factor affecting its use cost, and the maintenance of the damaged road will also affect the normal operation of the entire municipal and economy. Therefore, how to improve the road The service life of the construction has long been an urgent problem to be solved in construction. There are many reasons for the early damage and shortened life of the pavement; among them, the coordinated stress, anti-vibration and water accumulation between the pavement and various functional layers are the main reasons for the shortened life of the pavement; and the damage of water to the road has Pavement water damage can be divided in...

AI Technical Summary

Problems solved by technology

This measure can greatly reduce the degree of frost heave of the subgrade, but the problem is that due to the rise of capillary water, groundwater will still cause frost heave damage inside the pavement structure

[0008] Although the above structure can solve the aforementioned technical problems to a certain extent (mainly solving the problem that surface water enters the base course and subgrade from top to bottom from the top of the surface layer, and groundwater enters the base course and surface course from bottom to top from the top of the subgrade), however, the filling Atmospheric precipitation on the roadbed, water seepage embankment and other water sources beside the roadbed can still seep into the interior of the roadbed through the side slope of the roadbed or the side of the base. Entering the subgrade roadbed through the sides of the road and the bottom of the foundation, and so on, water entering the subgrade from various channels or ways to make the water content exceed the optimal water content of the subgrade design will lead to a decline in its strength and stability. damage to the pavement structure

Especially for expansive soil, tuff and other soil or rocky subgrade materials that are sensitive to water expansion, disintegration, and dehydration shrinkage, the effect of wet expansion and shrinkage is obvious, and slight changes in water content will cause significant road surface damage. Therefore, ensure that the subgrade The stability of the material at the optimal water content is very important. Therefore, in addition to preventing external water from entering the roadbed from all directions to increase the water content, it is also necessary to prevent the water evaporation and migration of the roadbed caused by climate and environmental changes. The water content is reduced, which is also the main problem that the pavement structure formed by this type of roadbed material has long-term damage such as cracking, subsidence, and collapse, and it is difficult to effectively solve it.

[0009] In addition, the above-mentioned structure does not contribute to the bearing capacity and mechanical stability of the subgrade itself. In the high-fill road section, the subgrade slope is often made into a stepped and relatively gentle slope, which occupies a large area. For road sections and some special roadbed road sections, the decline in the bearing capacity and stability of the roadbed will cause the formation of potential sliding surfaces and connect them, causing slope cracking, landslides, and subsidence damage to the pavement structure. It is said that the anti-vibration effect has been improved, but due to the adhesion on both sides of the subgrade, when uneven settlement and anti-vibration vibration occur in the subgrade, the independence, integrity and stability of the subgrade are insufficient, and the ability to adapt to deformation and coordination is not strong. Local diseases appear, and local diseases will further intensify the adverse effects of surface water and groundwater on road structures

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