The author believes that the sand layers in this lot are interconnected. This is the main reason why the vacuum preloading cannot meet the design requirements due to the lack of watertightness due to vacuum preloading. In order to solve the problem of vacuum pre-press sealing, after discussions with design agencies and experts, it was decided to lay underground continuous anti-seepage curtains at the periphery of the vacuum preloading zone. The impervious curtain is constructed with a shotcrete deep mixer, diameter 70cm, overlap 10cm, depth 12m. Shotcrete is prepared using cohesive soil, the design volume is 40-50kg/m, and the actual construction time is increased by 10kg/m for the sake of safety. .
Impervious curtain structure see. At the end of the construction of the anti-seepage curtain, the degree of vacuum has risen significantly. In order to prevent the impervious curtain that had just been completed from being destroyed, only one vacuum pump was scheduled to operate in the initial stage, and then gradually increased to four, and vacuum pumps were arranged to work in rotation. One week after the vacuum reached again and stayed around 80%, the re-starting of the building was resumed. Since then, work has progressed normally.
Vacuum preloading, as a new technology applied on expressways in recent years, has already manifested its unique advantages: the fast consolidation of soil, the elimination of the danger of embankment sliding and instability in a certain range, and can effectively shorten the construction period. Several kinds of rapid reinforcement of soft foundations are relatively inexpensive and have been rapidly promoted. However, vacuum preloading causes the destruction of surrounding buildings and facilities to occur in other highways in the Pearl River Delta region of Guangdong. For this reason, the author believes that vacuum preloading and its applicability must be discussed. Mechanism of Strengthening Soft Soil Foundation by Vacuum Preloading Method . The mechanism of vacuum preloading for soft soil foundation is to reduce the water pressure in the soil by vacuuming, so that the effective stress of the soil can be increased.
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