Biological treatment method for soft soil foundation

Abstract

The invention discloses a biological treatment method for soft soil foundation. The method comprises the following steps: paving bamboo grids and geotextile on the surface layer of the soft soil foundation, and then paving a coarse sand layer and a hill-skill soil layer thereon; embedding a corresponding observation instrument in the soft soil foundation; when less than 10 mm settlement in 48h isobserved, starting to roll by a road roller; when settlement is less than 5 mm under the vibration rolling in 48h, planting fast-growing tree seedlings on the flatly rolled field; culturing for 5 years to obtain mature growing trees; and digging out the tree crowns to obtain a service load with 6 T of consolidation degree and stability and the foundation with less than 30 cm of post-construction residual settlement. In the treatment method for the soft soil foundation, the fast growth of the fast-growing trees needs water absorption and the organisms in the soft soil foundation are decomposedto obtain fertilizer, thereby improving the penetrability of the soft soil foundation and reducing water content to realize consolidation.

Description

technical field [0001] The invention relates to the field of soft soil foundation treatment of geotechnical engineering. Background technique [0002] With the development of human society, the urbanization process is getting faster and faster, and land resources are becoming more and more scarce. There are more and more muddy soft soil foundation construction projects located along the coast, rivers and lakes, and the waste from dredging and remediation is used for sea reclamation. Projects in local areas are also rapidly increasing, and projects with an area of ​​more than 1 million square meters of soft soil that use high-water-content silt along the coast and along the river for dredging can be seen everywhere. The rational use of the combination of dredging and land reclamation is a win-win approach implemented in various places at present. Using dredged soil for land reclamation can improve the beautification of the urban environment and improve the comprehensive compe...

AI Technical Summary

Problems solved by technology

In order to achieve the reinforcement effect, a larger surcharge is required, but there is a risk that the surcharge exceeds the strength of the soft foundation, so the surcharge speed cannot be too fast

This method has a large amount of engineering and high cost. In some places, it is not easy to solve the problem of discarding the stockpiled materials, which has a great impact on the environment.

On the other hand, the muddy soil of coastal facies has the characteristics of high compressibility, high content of organic matter, and poor permeability (above 10-7ms). It is basically not drained and not consolidated. In the case of a large area of ​​silt without (excluded) lateral slippage, the solid silt under the surface hard crust has a relatively high bearing capacity, so that the thickness and stability of the surface hard crust can be determined. It determines the bearing capacity of soft soil foundation. Therefore, using the above conventional methods to treat muddy soil with poor permeability can generally meet the requirements of service load and post-construction settlement, but the degree of consolidation often cannot meet the service requirements, and the post-construction settlement in the later period is relatively large.