Thin-covering anti-soil-backing drag reduction measure for rectangular tunnel

Abstract

A thin-covering anti-soil-backing drag reduction measure for a rectangular tunnel comprises the following steps: 1, conducting water injection loading on an oil drum in the tunneling direction of therectangular tunnel; 2, drilling holes in the tunneling direction of the rectangular tunnel and injecting water; 3, downwards prefabricating concrete retaining blocks in the tunneling direction of therectangular tunnel; and 4, grouting at intervals. By the adoption of the technical scheme, the measure has the beneficial effects that the soil backing phenomenon occurring in the tunneling process ofa rectangular shield tunneling machine is reduced to the minimum through measures such as drilling hole and water injection and ceaseless anti-friction mud injection. The rectangular shield tunnelingmachine capable of discharging soil at the top is used, a hard soil layer cannot be formed at the tops of the rectangular shield tunneling machine, a pipe jacking machine and an annular pipe joint, and the soil backing problem is fundamentally solved.

Description

technical field [0001] The invention relates to a measure for preventing and reducing resistance of back soil with thin covering soil for rectangular tunnels. Background technique [0002] At present, various tunnel boring machines (comprising shield machines and pipe jacking machines) used at home and abroad all have different degrees of soil back phenomenon during construction. That is, due to the viscosity of the soil and the huge pressure, the soil sticks tightly to the outside of the shield machine, making it impossible for the soil to separate from the machine. If it follows the machine, it will cause serious disturbance of the surrounding soil layer, cause the surface to bulge or collapse, and seriously affect the shield machine. surroundings. [0003] Due to the shape, the circular shield machine is not easy to produce the back soil effect, but the large-section rectangular shield machine or similar rectangular tunneling machine, because the upper shell of the recta...

AI Technical Summary

Problems solved by technology

That is, due to the viscosity of the soil and the huge pressure, the soil sticks tightly to the outside of the shield machine, making it impossible for the soil to separate from the machine. If it follows the machine, it will cause serious disturbance of the surrounding soil layer, cause the surface to bulge or collapse, and seriously affect the shield machine. surroundings

[0003] Due to the shape, the circular shield machine is not easy to produce the back soil effect, but the large-section rectangular shield machine or similar rectangular tunneling machine, because the upper shell of the rectangular shield machine has a large area and a planar shape, it is easy to It is easy to produce back soil effect on the back of the upper shell of the rectangular shield machine

[0004] In the existing construction technology, the method of injecting anti-friction grout is generally used to reduce the back soil effect. The disadvantage is that when the rectangular cross-section becomes larger and larger, due to the unreliability of the grout flow, the back and surrounding areas of the shield machine will be damaged. Unable to form a slurry lubricating diaphragm, resulting in back soil phenomenon

Images