Study on settlement characteristics of deep soft strata by vacuum preloading

Abstract

Abstract In order to study the vacuum preloading settlement characteristics of Hengli Island soft strata, the monitoring data of the vacuum preloading area are analyzed, and the hyperbolic method and the three-points method are used to predict the final settlement. The results show that the variation trend of settlement, vacuum degree and water level has a high consistency. The larger the calculated data span, the larger the calculated result. The three-points method is closer to the measured value than the hyperbolic method, the ratio of the three-points method to the measured value was 94%∼110%, and the latter 110%∼120%. However, the three-points method is sensitive to settlement saltation, and the calculation result error will be large if the calculated data span the saltation region, while the hyperbolic method is not sensitive to settlement saltation. According to the settlement rate and predicted settlement, the unloading time is earlier than the actual unloading time, which provides a reference for the reasonable evaluation of the unloading time and the reduction of the low-efficiency preloading time.