Abstract
The deformation monitoring value of Hengli Island soft strata by vacuum preloading was analyzed. The results show that the vertical settlement and lateral displacement of strata mainly occur in the first 20 days. The negative pressure attenuation at different positions is quite different, and the average negative pressure attenuation rate with depth is about 3.2kPa/m. The difference of additional stress by the overlying water leads to the average settlement of the central area of the preloading area is greater than that of the marginal area. The settlement calculation results of Layered Summation Method are basically consistent with the measured values. According to the lateral displacement law of different projects, it is concluded that the lateral displacement has a progressive relationship with the vacuum preloading area half width, the prefabricated vertical drains (PVDs) length and the vertical settlement ratio of about 10 times, and the calculated value of lateral displacement agrees well with the measured value.
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