There are many types of fragile foundations, which can generally be divided into artificial fill foundations according to their causes: silt-containing clay foundations formed by marine, river and lake facies deposits: alluvial and diluvial foundations formed by various mountains Clay foundations sandwiched with pebbles and boulders. Their complex origins lead to complex physical and mechanical properties. Their common characteristics are low bearing capacity and high compressibility.

Nowadays, various types of reinforced concrete piles are generally used to treat fragile foundations with large thicknesses. Sand piles, lime piles, chemical grouting or pile-load preloading are generally used to treat fragile foundations with relatively large moisture content and porosity. Various treatment methods are highly targeted. Whether the treatment method is selected is reasonable or not, which directly affects whether the design of the building is safe and economical. In actual projects, the problem of dealing with fragile foundations with pine piles is rarely mentioned. The author thinks that in When conditions permit, using short wooden piles to deal with certain fragile foundations is not only faster in construction, but also more economical and reasonable.

According to the author’s practical experience in engineering construction on soft soil foundations, engineering geological surveys and geotechnical experiments must be carefully conducted before the design of soft soil foundations. Only by checking the conditions of the soil layer and soil quality can the design and construction be carried out correctly: Furthermore, It is necessary to start from the characteristics of the soil layer and soil quality of the site, conduct a comprehensive review of the structure, construction and use of the foundation and foundation, and rationally select a foundation treatment plan through plan comparison.

Generally, when the thickness of the pile is less than 5n, it is more suitable to use pine piles. In order to facilitate pile driving, the length of the pile should not exceed 4m. When making an end-bearing pile, in order to ensure that the pile tip can enter the bearing layer, the upper part can be excavated to the depth of the foundation first. Then drive the pile. The material of the pile must be pine wood, because pine wood contains rich rosin, which can well prevent groundwater and bacteria from corroding it, and the price is relatively cheap. Pine wood piles are suitable for operations below groundwater, and are suitable for changes in groundwater levels. In areas where the amplitude is large or the groundwater is highly corrosive, pine piles should not be used.

Practice has proven that when short wooden piles are used to deal with fragile foundations, they have the advantages of convenient construction and obvious economic benefits. They can prevent a large amount of earth excavation. Therefore, in areas with abundant pine resources, it is economically and technically economically and technically feasible to use pine piles to treat fragile foundations. It is feasible and it can be regarded as an effective means to deal with fragile foundations.