Control method and structure for shield tunnel underlying soft soil layer plastic deformation

Abstract

The invention discloses a control method and structure for shield tunnel underlying soft soil layer plastic deformation. The control method and structure for the shield tunnel underlying soft soil layer plastic deformation are suitable for a shield tunnel of underneath pass buildings/structures. The control method includes the following steps that a soft soil layer within a certain depth range is reinforced on the spaces at the two ends of the underneath pass buildings/structures so as to form soil bearing platform support structures, and the shield tunnel penetrates through the soil bearing platform support structures at the two ends; and support for bearing loads is achieved by utilizing the shield tunnel structure and an underground bridge span type anti-sedimentation structure formed by the soil bearing platform support structures at the two ends, so that plastic deformation of a tunnel underlying soft soil layer is controlled. The invention further discloses a corresponding control structure for the shield tunnel underlying soft soil layer plastic deformation. According to the control method and structure for shield tunnel underlying soft soil layer plastic deformation, through optimized reinforcement way design, the plastic deformation of the underlying soft soil layer is controlled, and the control method and structure cannot damage the tunnel structure and are especially suitable for the shield tunnel of the underneath pass buildings/structures.

Description

technical field [0001] The invention belongs to the technical field of shield tunnels, and in particular relates to a control method and structure for plastic deformation of an underlying soft soil layer of a shield tunnel. Background technique [0002] In recent years, shield tunnels have been widely used in soft soil areas such as Shanghai, Hangzhou, and Ningbo, including railways, subways, highways, and municipal industries. A large number of engineering examples show that shield tunnels in soft soil areas have experienced different degrees of long-term settlement after they are completed. It is difficult to correct it through corresponding engineering measures. Some relatively serious settlements not only pose a threat to the safety, durability and waterproofing of the shield tunnel itself, but also affect the smoothness of the track, which in turn affects the safe operation of railways and subways. [0003] In order to solve this problem, the current actual treatment ...

AI Technical Summary

Problems solved by technology

This technical solution reduces the plastic deformation of the soil and reduces the long-term settlement of the tunnel by reinforcing the underlying soft ground of the shield tunnel. The soft soil layer scheme has the following deficiencies. On the one hand, the soft soil layer under the building (structure) cannot be reinforced. If reinforcement is required, the building (structure) structure needs to be demolished, resulting in The cost has increased significantly; on the other hand, the above reinforcement scheme will cause damage to the structure of the shield tunnel itself, affecting the safety and stability of the tunnel

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