Deformation control method for close-range downward penetration of shield through composite-foundation building

Abstract

The invention provides an effective deformation control method for close-range downward penetration of a shield through a composite-foundation building. The building is researched prior to close-range construction and downward penetration of the shield so as to know specific conditions of the building, the building is pre-protected according to the obtained building conditions (structural features) such as the protection level of the building, the specific form of the foundation and the like, and pre-protection facilities mainly for reinforcement are constructed for the existing building foundation and infrastructure; numerical simulation analysis is performed through three-dimensional finite element software for every construction sequence and method and various conditions during downward penetration of the shield after construction completion of the pre-protection facilities; settlement monitoring is performed for the building and surrounding surface soil prior to downward penetration of the shield through the building; an appropriate progress scheme is adopted according to monitoring data during downward penetration of the shield; and secondary grouting and support structures are adopted for pipe pieces dropped out of the tail part of the shield to ensure that late settlement of the building meets standards.

Description

technical field [0001] The invention relates to a construction method in the technical field of tunnel engineering, in particular to a deformation control method for a tunnel passing under a complex foundation building at a short distance. Background technique [0002] The shield tunneling method is a construction method using a shield machine to excavate in the soil layer or soft rock layer below the surface. Due to its advantages such as high safety, high efficiency, less harm, and good economy, it has been used in energy It has been widely used in tunnel construction in fields such as transportation and traffic, and has become one of the important methods for underground tunnel construction. When it is used in urban subway construction, it generally passes through urban areas with dense population, concentrated houses, heavy traffic, and dense underground pipelines. The settlement of buildings or pipelines caused by such construction may endanger the integrity of its str...

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Problems solved by technology

[0003] At the same time, because there is no uniform standard for the foundation reinforcement used by urban houses, it is very messy. When the shield construction line is above the complex foundation building, the disturbance of the soil below the foundation by tunnel excavation may cause the building to go under the foundation or appear Insufficient bearing capacity and excessive foundation settlement, or uneven settlement,

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