Abstract
In the infrastructure construction of my country and the countries along the “Belt and Road”, there are many projects involving peat soil foundation treatment, but there is a lack of in-depth research on the properties of peat soil and foundation treatment technology, and there is no complete set of relevant foundation treatment technical specification systems. However, the traditional replacement method for ground treatment characteristics cannot meet the needs of energy saving, environmental protection and green development concepts. This article adopts the method of literature research, taking Sri Lanka (CKE project) as an example to introduce the engineering foundation treatment technology of peat soil in detail, and provide a reference for the construction and treatment of peat soil foundation. How to realize the technical problem of peat soil-based treatment needs to be solved urgently, so the understanding of peat soil requirements is beneficial in the long term.
Highlights
Peat soil is a special soil formed by organic matter and minerals under appropriate climate and topographical conditions
The total area of peat soil in the world is as high as 4.153 million square kilometers, and the distribution of peat soil in China accounts for about 4.5% of the total land area of the world[1]; my country's peat soil is mainly distributed in Yunnan-Guizhou region, southeast coast and northeast region, and peat soil distribution area in typical countries in the world As shown in Table 1, peat soil has extremely high water content, low bearing capacity, large void ratio, low shear strength, high organic matter content, and high compressibility compared to general soft soil foundations
Based on the data from the test site, the CKE project summarizes the empirical formula for the overconsolidation ratio of peat soil foundation in the static cone penetration test as follows: S σ n ∙ OCR
Summary
Peat soil (a collective term for peat and peat soil) is a special soil formed by organic matter and minerals under appropriate climate and topographical conditions. The total area of peat soil in the world is as high as 4.153 million square kilometers, and the distribution of peat soil in China accounts for about 4.5% of the total land area of the world[1]; my country's peat soil is mainly distributed in Yunnan-Guizhou region, southeast coast and northeast region, and peat soil distribution area in typical countries in the world peat soil has extremely high water content, low bearing capacity, large void ratio, low shear strength, high organic matter content, and high compressibility compared to general soft soil foundations. The permeability and compressibility of peat soil show anisotropy, which is often not conducive to engineering construction. Poor water permeability will affect the drainage and consolidation of soil.The specific manifestation is that the settlement of the building lasts for a long time, which will cause harm to the construction and use of the building project. Since the formation of peat soil is affected by many factors, a single physical index cannot well reflect the properties of peat soil. For the analysis of peat soil physical indicators, it is necessary to choose peat soil-based treatment methods
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