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Project example Since 1976, Hohai University has started vacuum preloading theory research and successively cooperated with the transportation department to implement the practice of soft soil foundation reinforcement for projects such as Tianjin Xingang and Lianyungang Soda Plant. In 1998, combined with the characteristics of highway embankment construction, it took the lead in developing the vacuum-surcharge combined preloading technology for highways. It has been applied in projects in Guangdong and Zhejiang, and has achieved significant economic benefits. Now we introduce some of the projects as follows: Beijing-Zhuhai Expressway Guangzhou to Zhuhai East Line Project. The Zhuhai-Zhuhai Expressway Guangzhu Section borders the coast, while the northern part lies in the Pearl River Delta Coastal River Network. The terrain is flat and open, rivers and waterways are vertically and horizontally, and the southern part enters the hilly area, and the terrain is undulating. The Tanlu-Xinlong section between the Hailong Bridge and the Donghe Bridge is located in the front of the Pearl River Delta. The sedimentary origin is mainly in deltaic land-sea interaction. The thickness of soft soil is generally more than 30m, and the thickness is more than 40m, and it is distributed on the surface. Below the shell. Silt and silt clay are the main soft soils.
In 1998, Hohai University used the vacuum-surcharge combined preloading method to reinforce the highway soft foundation for the first time and achieved good results. The embankment filled with 4.2m high was only used for one month, the reinforced depth was over 25m, and vacuum was applied for three months. After unloading, the subgrade settlement is basically stable. It is the load curve and settlement comparison of the treatment section and the Beijing-Zhuhai Expressway that are using the surcharge preloading method. It can be seen that, compared with the surcharge preloading method, the vacuum-surfacing combined preloading method has a significant effect on the reduction of post-construction settlement, and the post-construction settlement speed is very fast, and the required preload period is much smaller than that of the surcharge preloading method. Piled preloading method.
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