Rapid treatment method for controlling ground surface settlement caused by stratum funnel of large-diameter shield construction

Abstract

The invention discloses a rapid treatment method for controlling ground surface settlement caused by sudden stratum funnel of large-diameter shield construction. The method comprises the following steps of Exploring the range of the stratum funnel, investigating interval buildings, performing ground monitoring, reinforcing soil below the ground buildings through layer-by-layer deep hole grouting,performing pre-grouting reinforcement on a tunnel and the stratum funnel above the tunnel, and detecting the reinforcement effect. According to the steps, disturbed soil under the building is vertically drilled from the ground for layered grouting reinforcement, a water outlet channel at the bottom of the stratum funnel is sealed and blocked from bottom to top by adopting a grouting process, and besides, the reinforcement effect is inspected by combining multiple modes, so that the continuous safety and stability of the ground building and the tunnel are ensured. The method can solve the problem of ground surface settlement caused by the sudden stratum funnel of large-diameter shield construction, and overcomes the engineering difficulties of large constraint of early-stage exploration means and settlement damage of dense and old buildings on the ground caused by sudden unfavorable geology shield water inflow.

Description

technical field [0001] The invention relates to the field of controlling ground subsidence during shield construction, in particular to a rapid treatment method for controlling ground subsidence when large-diameter shield construction encounters a funnel in the ground. Background technique [0002] Urban subway shield tunnels often pass through dense clusters of old buildings, which has a significant impact on the original urban arterial roads, buildings, and underground structures. Due to the dense old buildings and shallow foundation buildings, the geological survey in the early stage is very limited, and the geological survey and drilling are often unable to cover the entire interval accurately. At this time, it is easy to encounter the formation funnel under the building when the shield passes through. . In general, the range of stratum funnels is relatively small, which belongs to the sudden change of terrain and geology. During the preliminary survey, it is difficult ...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to effectively solve the problem of uneven settlement when large-diameter shield tunnels encounter stratum funnels, ensure the long-term safety and stability of ground buildings and underground shield tunnels, and speed up the construction process of shield tunnels passing through dense building groups

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