Device and method for monitoring influence of deep foundation pit excavation on subway vertical deformation

Abstract

The invention belongs to the technical field of geotechnical engineering and underground space engineering field monitoring, and relates to a device and method for monitoring the influence of deep foundation pit excavation on subway vertical deformation, which comprises a monitoring rod piece, an observation prism, an anti-tilting concentric support, a protective sleeve, filling sand and a concrete base, wherein the threaded end of the monitoring rod piece is connected with the hollow end of the monitoring rod piece through a monitoring rod piece body, the top of the connected monitoring rod piece is connected with the observation prism, the bottom of the connected monitoring rod piece is connected with the concrete base, the protective sleeve is arranged outside the connected monitoring rod piece, and the space between the monitoring rod piece and the protective sleeve is filled with filling sand. According to the method, the vertical displacement of the deep soil body in the pit andthe vertical displacement of the subway tunnel in the deep foundation pit excavation process are combined, the safety of deep foundation pit excavation to subway operation is evaluated in time throughdynamic monitoring, and early warning is conducted, so that the soil layer deformation rules in the subway tunnel, in the foundation pit and around the foundation pit in the deep foundation pit excavation process are obtained. A decision basis is provided for excavation of a deep foundation pit close to a subway.

Description

technical field [0001] The invention belongs to the technical field of on-site monitoring of geotechnical engineering and underground space engineering, and in particular relates to a device and method for monitoring the influence of deep foundation pit excavation on the vertical deformation of subways. Background technique [0002] At present, urban rail transit is booming across the country, and the urban subway transportation that has been built and operated and is under construction has played a huge role in promoting regional economic development. The construction of the subway mostly passes through the bustling areas of the city, driving the construction of residential, commercial, and municipal projects along the subway, forming a unique economic development circle along the subway. The related construction along the subway line inevitably produces a large number of deep foundation pit excavation projects, and the excavation of deep foundation pits can cause vertical ...

AI Technical Summary

Problems solved by technology

The related construction along the subway line inevitably produces a large number of deep foundation pit excavation projects, and the excavation of deep foundation pits can cause vertical uplift deformation and lateral deformation of the completed subway tunnels, especially for subways near deep foundation pits. , which poses a huge threat to the daily safe operation of the subway

[0003] The existing deep foundation pit monitoring pays more attention to the horizontal deformation of the side wall of the deep foundation pit and the vertical displacement of a certain range outside the foundation pit due to the requirements of regulations and policies. The vertical uplift of the layer is less concerned

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