Shield tunnel construction ground settlement control method

Abstract

The invention provides a shield tunnel construction ground settlement control method, which includes the stages of construction preparation, trial excavation, formal excavation and shield tail leakage. The method particularly includes: using an initially tunneling section of front 100m as a trial tunneling section, dividing the trial put section of 100m into three sections, establishing control measures for tunneling for the third section, control for ground settlement and tunnel axes, lining installation quality and the like, and basically mastering construction parameters including tunneling speed, the volume of excavated earth of each turn, the water injection rate of each turn, shield deviation rectifying amplitude, synchronous grouting amount and slurry quality; and determining a shield tunneling axis according to the construction parameters measured at the construction preparation stage, and performing formal excavation according to the shield tunneling axis. By the aid of the construction technique, a reinforcing and moving range can be narrowed to the minimum extent, shield construction is performed at a uniform speed in a balanced manner, disturbance of shield tunneling change to soil is decreased, the overall construction cost of a project is reduced, and the requirement of ground settlement control is met.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a method for controlling ground subsidence during tunnel construction. Background technique [0002] After the 1990s, many cities in our country began to launch subway projects, and began to introduce and apply international advanced shield construction technology and equipment on a large scale. The subway projects were rapidly constructed in some cities, and the ground subsidence technology covered by them developed accordingly. my country's application of the shield method to build tunnels began in Shanghai in the 1950s and 1960s. With the in-depth research of shield tunneling method and the increase of engineering applications, the construction technology of shield tunneling method has been developed and improved. In recent years, shield tunneling technology has made significant progress. There are also differences in the mastery of the construction techniques an...

AI Technical Summary

Problems solved by technology

With the in-depth research of shield tunneling method and the increase of engineering applications, the construction technology of shield tunneling method has been developed and improved. In recent years, shield tunneling technology has made significant progress. There are also differences in the mastery of the construction techniques and technologies of different methods. Although the national and some local standards can control the surface settlement within +10~-30mm, tunnels can be excavated safely at a distance of less than 1m from existing buildings and structures. The deformation of buildings and structures can be controlled below 2-5mm and other surrounding environmental protection issues have been uniformly stipulated, but some problems are still prone to occur in the application, which is always one of the construction problems