A Lateral Partition Method for Reducing Surface Subsidence and Building Deformation During Underground Structure Construction

Abstract

The invention discloses a transverse partition method for reducing ground surface settlement and building structure deformation of underground structure construction. In a foundation pit or a pilot tunnel, a transverse reinforcing structure layer which has controllable vertical bearing capacity and is located between an existing building foundation and a planned underground structure is formed through a non-excavation technology method. When the reinforcing structure layer is close to the bottom of the existing structure foundation, the reinforcing structure layer servers as a raft foundation or a strip foundation of the existing structure, and the capacity of the existing structure for resisting deformation is enhanced. When the reinforcing structure layer is close to the top of the planned underground structure, the reinforcing structure layer serves as a transverse bearing system of the planned underground structure, and influences of stratum deformation caused by the planned underground structure on the existing building foundation are isolated. The transverse partition method can effectively reduce the problems of ground surface settlement in the underground structure construction and deformation of adjacent buildings, and has the advantages of being good in construction flexibility, wide in application range and controllable in reinforcement effect.

Description

technical field [0001] The invention relates to the technical field of underground construction engineering, and relates to a novel method for reducing ground subsidence and deformation of buildings and structures during underground structure construction and a structure-transverse partition method. Background technique [0002] With the rapid development of urban construction, urban space is becoming increasingly tense, and underground tunnel projects often pass through various buildings and structures. The construction of underground tunnel engineering will inevitably cause stratum movement and surface subsidence, which will cause subsidence, deformation and even destruction of surface buildings and structures. At present, there are two main solutions to the reinforcement and protection of buildings and structures in China. One is to improve the anti-deformation ability of buildings and structures, mainly by means of structural reinforcement and foundation underpinning; th...

AI Technical Summary

Problems solved by technology

However, due to factors such as the current grouting technology, process, and the applicability of the formation to grouting, the cost of grouting reinforcement is high, and the effect cannot be predicted. It is difficult to determine the bearing capacity of the reinforced formation. This method is expensive and has poor effect. And generally need to be used in combination with other methods;

[0005] The partition method is to lay one or more rows of pile foundations between the proposed underground structure and the existing structure above to isolate the effect of ground movement and surface settlement on the existing structure caused by the construction of the underground structure. In the field, this method is widely used and the effect is good, but it is generally only applicable to the situation where there is a certain horizontal distance between the existing structure and the planned underground structure plane

Images