Vacuum combined surcharge preloading construction method applied to soft soil foundation treatment

Abstract

The invention relates to a vacuum combined surcharge preloading construction method applied to soft soil foundation treatment. The vacuum combined surcharge preloading construction method applied to the soft soil foundation treatment comprises a loading method, a monitoring method and an after-engineering disposing method. The loading method comprises steps of a, enabling the vacuum degree to achieve more than 80 KPa, performing voltage stabilization for 10 to 15 days, draining water in a preloading area and covering sealing films to be protected at the early operation stage of the preloading area vacuum system; b, filling a level crossing; c, filling a first layer; d, filling other layers in a supercharge mode; the monitoring method comprises steps of a, settlement monitoring of a surface layer of the preloading area; b, settlement monitoring of a deep layer of the underlying stratum; side inclining and side pile observation; d, monitoring of the vacuum degree under the films; the after-engineering disposing method is applied after the vacuum combined surcharge preloading treatment and adopts detection of the bearing capacity of foundation soil or adopts layered excavation to perform detection of degree of compaction. The vacuum combined surcharge preloading construction method can reduce consumption of electricity for construction and save construction costs and project management costs.

Description

technical field [0001] The invention relates to a vacuum combined surcharge preloading construction method, in particular to a vacuum combined surcharge preloading construction method applied to soft soil foundation treatment. Background technique [0002] The vacuum combined surcharge preloading method applied to soft soil foundation treatment has been widely used since the beginning of this century, and its application technology has become increasingly mature. However, in the process of application, especially during the stacking operation, due to the influence of weather factors (such as excessive soil moisture content caused by rainfall) and the limitations of layered compaction and testing regulations, it is impossible to achieve rapid and continuous loading operations. As a result, the filling rate of the vacuum system is very slow after the operation of the vacuum system. In some cases, the loading time is even extended to seven or eight months, which makes the opera...

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Problems solved by technology

That is, in the early stage of vacuum pumping, when the consolidation degree of the preloading area has not yet increased, due to the influence of external factors, the loading speed is too slow, and the added load cannot meet the settlement requirements in time, so that the urgently needed load for the settlement during the preloading period cannot be added in time. After the consolidation degree and bearing capacity of the preloading area are significantly improved, the required load can only be added in place, which makes the settlement during the preloading period too small and cannot meet the design requirements; secondly, the influence of external factors leads to a decrease in the vacuuming capacity of the vacuum system, which affects the preloading period. Subsidence

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