Pile-reinforcement material composite foundation structure and construction methods thereof

Abstract

The invention discloses a pile-reinforcement material composite foundation structure and construction methods thereof. The pile-reinforcement material composite foundation structure comprises a plurality of supporting piles, reinforcement materials, a low-rigidity material filling layer and a soil filling layer, wherein the supporting piles are separately and vertically penetrated in a soft soil foundation; the lower part of each of the supporting piles penetrates in the soil foundation, and the upper part of each of the supporting piles is buried in the low-rigidity material filling layer; the top surfaces of the supporting piles are in contact with the reinforcement materials; and the soil filling layer is covered on the reinforcement materials. One construction method comprises the following steps of performing piling; digging up part of filled soil; performing filling with substitute materials; paving the reinforcement materials; performing opposite packing and fixing on road shoulders; and paving upper covered filled soil. The other construction method comprises the following steps of performing superficial-layer material stirring and mixing; performing piling; paving the reinforcement materials; performing opposite packing and fixing on the road shoulders; and paving the upper covered filled soil. According to the pile-reinforcement material composite foundation structure and construction methods thereof disclosed by the invention, the stretching resistance effect of the opposite packed reinforcement materials can be sufficiently utilized, so that the problem that the lateral displacement of a roadbed and the lateral displacement of a road embankment are large is solved; and the soil arching effect and the film effect can also be sufficiently utilized, the differential settlement of the roadbed is improved, and the purpose of improving the integral stability of a road is achieved.

Description

technical field [0001] The invention belongs to the technical field of soft soil foundation, and in particular relates to a pile-reinforced material composite foundation structure and a construction method thereof. Background technique [0002] Soft soil foundation settlement is one of the common geotechnical engineering diseases. The original control measures are mainly soil replacement cushion method, and the modern prevention measures mainly include pile-supported reinforced cushion method and reinforced anchorage method. Several methods of composite foundation can improve the shortcomings of insufficient bearing capacity of the foundation and insufficient shear strength of the soil, thereby reducing the uneven settlement of the subgrade and enhancing the overall stability of the embankment. [0003] The method of replacing the soil cushion method to treat the soft soil subgrade has certain defects when it is applied to the soft soil foundation under the embankment, whic...

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Problems solved by technology

[0003] There are certain defects when the method of replacing the soil cushion method to deal with the soft soil subgrade is applied to the construction of the soft soil foundation under the embankment, which is manifested in two aspects: first, the problem of uneven settlement is still significant

Engineering practice shows that there is still a certain phenomenon of uneven settlement when the soil replacement method is used to treat the subgrade, resulting in the lateral displacement of the embankment slope, the delay of the project, and the consumption of resources.

Second, the cost of sand cushion material and laying is high

After the reinforced material and the pile are anchored, the tensile strength of the untensioned reinforced material is limited, so that the reinforced material cannot fully exert its tensile performance

Second, the phenomenon of stress concentration is more obvious

The tensile properties of reinforced materials are limited. If the displacement range is forcibly limited, it is easy to cause the reinforced materials to be damaged before they exert the strength of the enhanced fill.

3. The soil arch effect of reinforced materials is not significant

Fourth, the construction process is more cumbersome

5. Construction progress is slow

The construction requires pouring rivets at the pile cap after the reinforcement material is laid, and the engineering volume is large. Therefore, the construction speed is affected by factors such as the speed of masonry, the speed of materials entering the site, and the limitation of the number of masonry per day, resulting in slow construction progress and a long construction period.

6. High construction investment

In this case, construction investment will increase substantially

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