Abstract
Research at home and abroad shows that subway excavation often causes soil stress loss, resulting in settlement deformation and horizontal displacement of stratum. Therefore, combined with the special engineering geological conditions in Kunming area, the foundation deformation caused by subway excavation is studied, so as to provide an important foundation for proposing the protection measures of surrounding buildings and buried pipelines and promoting the construction of subway.
Highlights
In order to evaluate the influence of tunnel excavation on surrounding buildings and buried pipelines, the deformation affected area caused by tunnel excavation is usually evaluated first, and the main characteristics and displacement of soil deformation in different influence areas are determined
The ground settlement and deformation caused by tunnel excavation are closely related to the soil layer and overlying soil layer
According to the analysis and research at home and abroad, the soil deformation caused by tunnel can be divided into two stages, namely, the instantaneous soil settlement and deformation caused by excavation unloading in the process of excavation, and the long-term deformation increasing with time due to the consolidation and creep of cohesive soil layer in the later stage of construction
Summary
Subway is a kind of rail transit with large passenger capacity, fast and punctual, comfortable, safe and environmental protection. The business along the line improves the living space and convenience, improves the urban investment environment, and changes the distance pattern between cities; the convenient connection between subway and airport, bus station, taxi station, bicycle and other public transport means greatly shortens the distance between cities, and greatly improves the urban investment environment; the change of urban distance pattern makes people live in the suburbs And the life of working and shopping in the city center has become a reality It brings value-added to the land along the line, and brings a kind of "subway economy" with unlimited business opportunities, so as to boost a district and increase the appreciation space of property. Ground deformation may lead to ground buildings incline, even crack, collapse, and destroy underground pipelines; horizontal displacement of strata can cause the displacement of underground pile foundation and the dislocation of pipeline and channel, which will lead to the decrease of bearing capacity of pile foundation and affect the normal use of pipelines and channels, or even destroy them
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