Anti-emptying self-compacting roadbed structure and construction method

Abstract

The invention discloses an anti-emptying self-compacting roadbed structure and a construction method. The anti-emptying self-compacting roadbed structure comprises an original foundation and a filling roadbed arranged on the original foundation, a plurality of layers of obliquely inserted guide plates are arranged in the original foundation where the bottom and the two sides of the filled roadbed are located, and the guide plates are used for preventing the original foundation from being scoured by rising tide water flow and intercepting and accumulating silt particles in falling tide water flow so as to compact the original foundation; and the direction of obliquely inserting the guide plates into the original foundation is consistent with the rising tide water flow direction in the original foundation when the tide rises. The guide plates can effectively prevent a water flow from scouring an original foundation roadbed working area during flood tide, densification and compaction of a roadbed can be achieved through the water flow and pavement loads, and the self-compaction effect of the flow guide plate is gradually obvious as time goes on; therefore, the original foundation strength is improved, the soil permeability is greatly reduced, and the anti-seepage and anti-emptying effects are achieved.

Description

technical field [0001] The invention relates to the technical field of roadbed structures, in particular to a hollow-proof self-compacting roadbed structure and a construction method. Background technique [0002] The total length of China's coastline is about 32,000 kilometers, of which the mainland coastline is about 18,000 kilometers, and the island coastline is about 14,000 kilometers. In order to solve the transportation problem of coastal residents, my country has a large number of coastal roads in the coastal areas and is still building them. However, because the coastal road is too close to the ocean, and the groundwater has periodic fluctuations under the influence of tides, many filled roadbeds near the coast are continuously eroded during the periodical rise and fall of the water level, resulting in partial hollowing out of the roadbed. , and even lead to large deformation or collapse of part of the roadbed, the problems of the roadbed will be directly reflected on ...

AI Technical Summary

Problems solved by technology

[0002] The total length of China's coastline is about 32,000 kilometers, of which the mainland coastline is about 18,000 kilometers, and the island coastline is about 14,000 kilometers. In order to solve the transportation problem of coastal residents, my country has a large number of coastal roads in the coastal areas and is still building them. However, because the coastal road is too close to the ocean, and the groundwater has periodic fluctuations under the influence of tides, many filled roadbeds near the coast are continuously eroded during the periodical rise and fall of the water level, resulting in partial hollowing out of the roadbed. , and even lead to large deformation or collapse of part of the roadbed, the problems of the roadbed will be directly reflected on the road surface, that is, uneven settlement, cracks or holes with large differences in the road surface, which will affect driving comfort and bring great impact to driving safety. Big threats and challenges; in view of the above problems, the conventional treatment methods in the prior art are nothing more than adding a reverse filter layer, or increasing the compaction standard in the layered compaction of the roadbed, or adding cement mixing piles to the lower part of the roadbed for reinforcement, etc.

[0003]The anti-filter layer is set at the lower part of the roadbed: this method cannot completely avoid the hollowing out of the filled roadbed, but only delays the process. In addition, due to the filling The original foundation part of the lower part of the roadbed cannot be effectively protected, and the hollowing out of the original foundation part will also affect the stability of the filled roadbed, which will lead to permanent deformation of the road surface; replace or increase the compactness standard of the roadbed fill: general roadbed stratification The degree of compaction is controlled at 90%-95%. Further improvement of the degree of compaction will inevitably increase the number of rolling times, thereby increasing construction costs. The replacement of soil and filling of soft soil subgrades consumes equipment and manpower, which greatly increases carbon emissions and is not compatible with environmental protection. Contrary to sustainability; the foundation part is reinforced by pouring cement mixing piles: this method needs to use a large amount of cement slurry and construction machinery, the construction period is long, and the cost is high. In addition, in the application of the project, due to the design method Relatively conservative, the replacement rate is as high as 40% to 80%, and the design strength of the pile generally does not exceed 0.6MPa. At the same time, due to insufficient investment in theoretical research, complete stress field and deformation field data have not been obtained, making the design calculation method unsatisfactory. At the same time, in the practice of engineering, due to the backwardness of the performance of the mixing machinery and the construction monitoring system in our country, such as the lack of monitoring devices for the quality of construction piles, the phenomenon of blocking soil and breaking piles requires strict manual monitoring, etc.

[0004] Therefore, it is different from the anti-scour roadbed, which periodically changes the flow direction of the tide, and then carries out the hollowing out through the periodic fluctuation of the underground water level , so far the entire industry has not yet had a better solution

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