Advanced grouting control method suitable for urban subway tunnels

Abstract

The invention discloses an advanced grouting control method suitable for urban subway tunnels. According to the method, firstly, the length of each cyclic grouting pipe, the parameters of drilled holes and the arrangement mode of drilled holes are determined. Secondly, taking the layout diagram of drilled holes as a basis, a numerical simulation means is adopted for establishing a finite element analysis model about the diameter of grouting holes, the diameter of geotechnical cloth bags and the grouting amount. After that, the reinforcing effect of different geotechnical cloth bag expansion rates on the stratum, and the distribution situation of the corresponding displacement field, the corresponding stress field and the corresponding plastic area are analyzed. In this way, the optimal diameter of geotechnical cloth bags and the optimal grouting amount are determined. Thirdly, holes are drilled along the tunneling direction of a tunnel through a drilling machine, and a certain externalinsertion angle is formed in each drilled hole. Fourthly, a well prepared grouting pipe coated with the geotechnical cloth bag is put into a drilled hole. Sixthly, the slurry is injected into the grouting pipe, and then the slurry flows into the high-strength geotechnical cloth bag through slurry outlet holes. In this way, the geotechnical cloth bag is filled to expand. The final grouting amountis determined according to the numerical simulation calculation result. Finally, the grouting is carried out on the grouting pipe in a mode of spacing drilling and grouting, and a transverse grout stopping wall structure is formed.

Description

technical field [0001] The invention relates to an advanced grouting control method for urban subway tunnels, which is especially suitable for controlling the surface and surrounding rock deformation of urban subway tunnels under the condition of shallow or extremely shallow buried soft ground. Background technique [0002] At present, my country's urban subway construction is gradually entering a period of rapid development. However, due to the shallow buried depth of subway tunnels and complex urban underground pipelines, problems such as landslides, surface subsidence, and pipeline ruptures are easily caused during the construction process, endangering the safety of construction personnel and equipment, and affecting the surrounding environment and normal production and life of residents. [0003] In order to ensure construction safety and reduce the impact of construction on the urban environment, the ground is usually reinforced by pre-grouting in advance. The grout is...

AI Technical Summary

Problems solved by technology

However, due to the concealment of the grouting project, it is difficult to control the diffusion process of the grout, the diffusion range, and the filling and compacting degree of the grout to the formation during the grouting process. To meet the requirements, if the grouting volume is too large, it will easily cause the surface to rise too much, leading to problems such as road surface, building damage and underground pipeline rupture.

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