Construction method suitable for making shield penetrate through building in close range on liquefied sandy soil stratum

Abstract

The invention relates to a construction method suitable for making a shield penetrate through a building in a close range on a liquefied sandy soil stratum. The construction method comprises the steps that before construction, the geology and environment of a construction range are surveyed, and survey data are obtained; construction technical measures in the construction process are designed according to the survey data; the monitoring frequency is increased when the shield penetrates through the building, and construction parameters in the construction technical measures are dynamically adjusted according to monitored monitoring data; during pushing construction of the shield, pipe sections 8-10 rings away from the shield tail after being detached from the shield tail are subjected to micro-disturbance grouting, and the grouting pressure is controlled to be smaller than or equal to 0.3 Mpa; and after construction is finished, the disturbance condition of a construction tunnel is predicted, and corresponding control measured are set out. According to the construction for making the shield penetrate through the building in a close range on the liquefied soil stratum, a micro-disturbance construction control technique is adopted, the situation that liquefied sandy soil is liquefied due to disturbance in the shield pushing process can be avoided, settlement is effectively controlled, and the building safety is guaranteed.

Description

technical field [0001] The invention relates to the field of shield construction, in particular to a construction method suitable for shield tunneling through buildings in liquefied sandy soil strata at short distances. Background technique [0002] In the construction of urban rail transit, a large number of subway tunnels are constructed using the shield method, and considerable experience has been accumulated. Under normal circumstances, the impact of shield propulsion on the surrounding environment has been well predicted and controlled. However, there are liquefied soil layers in some areas, and soil liquefaction mainly occurs in areas with sandy soils and high groundwater levels, such as coastal areas, alluvial plains where rivers pass through, or old channel distribution areas, etc. These areas often distribute some loose sandy soils that are full of groundwater and saturated. Because of their weak structure, the soil structure is easily changed by external forces. ...

AI Technical Summary

Problems solved by technology

[0009] In the liquefied sandy soil with poor stability, domestic shield tunneling construction experience is insufficient, and dangerous situations occur frequently

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