A construction method for subsidence control of shield tunneling through building groups in water-rich silt-sand strata

Abstract

The invention belongs to the technical field of tunnel construction, and in particular relates to a settlement control construction method for shield tunneling under a water-rich silt sand stratum to pass through building groups. In order to solve the problem of cracking and damage of the buildings caused by the excessive settlement of the shield machine under the weak stratum of water-rich silt sand in the past. Specifically, before the shield excavation reaches the affected area, the numerical model analysis of the construction of the underpass building group is carried out in advance by using the geotechnical finite element analysis software, and the shield parameters controlled when the underpass is obtained; the underpass construction process During the process, strict control of construction parameters and synchronous grouting are used to reduce the impact on the ground surface and building foundation. The invention improves the drawbacks that the previous shield tunneling machine passes through building groups, and the buildings are cracked and damaged due to excessive settlement, and the application effect is good. The construction of building groups under earth pressure balance shield under different crossing geological conditions, especially in the construction of structures under shield tunneling in weak silt sand strata, has a very broad prospect of promotion.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a settlement control construction method for shield tunneling under a water-rich silt sand stratum to pass through building groups. Background technique [0002] The shield tunneling method is a fully mechanized construction method in the underground excavation method. With the vigorous development of rail transit construction in major cities, the shield tunneling method construction has the characteristics of good safety, high efficiency and low noise. The method has been widely used. When shield excavates in water-rich and weak strata, the settlement is not easy to control because of the poor stability of the water-rich and soft stratum. The excessive settlement of the building will cause the building to crack, tilt or even collapse, resulting in significant economic losses and bad social impact. [0003] At present, the theory of shield passing throug...

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Problems solved by technology

[0004] The present invention solves the problem of cracking and damage of buildings caused by excessive subsidence of shield tunneling machines in soft water-rich silt sand strata in the past.

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