A monitoring method for the construction effect of foundation pit support piles under elevated high-speed railway lines

Abstract

The invention discloses a method for monitoring construction effect of foundation pit support piles below an elevated high-speed railway line. Through the method, the problem that the foundation pit monitoring criterion is not suitable for high-speed railway elevated foundation pit excavation monitoring in the prior art is solved. The method has the beneficial effect of being capable of guaranteeing safety operation of a high-speed railway elevated bridge. According to the scheme, the method for monitoring the construction effect of the foundation pit support piles below the elevated high-speed railway line comprises the following steps of (1) making monitoring plans, including layout schemes of bench marks, ground settlement monitoring points and deep soil displacement monitoring points,according to the support pile construction scheme and the situation that the support piles approach to an elevated high-speed railway foundation and conducting construction; (2) conducting monitoring;(3) analyzing monitoring data to judge the range and degree of the effect of the support pile construction process on displacement fields of soil bodies approaching to the support piles, determiningthe effect of the support pile construction process on the elevated high-speed railway foundation and then judging the effect of the support pile construction effect; and (4) giving an early warning on a construction party according to the effect, obtained by analyzing the monitoring data, of the support pile construction effect.

Description

technical field [0001] The invention relates to the field of construction monitoring, in particular to a method for monitoring the construction effect of foundation pit support piles under elevated high-speed rail lines. Background technique [0002] High-speed rail stations are generally located outside the city, such as Jinan West Railway Station, Nanjing South Railway Station and so on. Most high-speed rail lines have elevated lines. With the extension of urban municipal roads, some main roads and underground pipelines and other municipal facilities often need to pass through elevated high-speed rail lines and form foundation pits under elevated high-speed rail lines. The foundation of the elevated high-speed railway bridge is sensitive to the displacement of the surrounding soil, and the crossing construction has a greater impact on it. And when the foundation of the elevated high-speed rail bridge is very strict on deformation control, when the foundation pit project p...

AI Technical Summary

Problems solved by technology

The excavation of the foundation pit under the elevated high-speed railway line is often very close to the foundation of the existing viaduct bridge, and ignoring the construction effect of the foundation pit support structure on the foundation of the elevated high-speed railway bridge will likely cause major safety accidents and huge economic losses. The existing foundation pit monitoring norms and technologies are not suitable for the monitoring of foundation pit excavation under elevated high-speed rail lines

[0004] Commonly used support structure construction effect monitoring has the following defects: ① The monitoring process is out of order, and a systematic and complete monitoring process has not been formed, which makes the construction and monitoring out of touch. When there are potential safety hazards in the existing structure during the construction process, it cannot Timely analysis, early warning and resolution, can not give full play to the role of monitoring

②The monitoring objects are mainly adjacent to existing structures, ignoring the correlation between the monitoring of existing adjacent structures and the monitoring of support structure construction

③ Existing monitoring methods are only limited to the construction of a certain place, and cannot provide guidance for subsequent construction

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