Large-section deep hole grouting construction method for complex stratum in water-rich area

Abstract

The invention relates to a large-section deep hole grouting construction method for a complex stratum in a water-rich area, which belongs to the technical field of underground engineering construction, and is characterized in that different grouting slurries are selected by combining different surrounding rock conditions, and the slurry with the optimal mix proportion is obtained by matching with a test in a laboratory. During site construction, the grout proportion is dynamically adjusted, the grout gelation time is adjusted, and the grouting and water stopping effect is guaranteed. The deep hole grouting hole sites are arranged according to the section of the pilot tunnel, in order to achieve the section water stopping effect and the waterless excavation condition, multiple sets of deep hole grouting hole sites are arranged along the side wall of the pilot tunnel at intervals, each set of deep hole grouting hole sites are continuously arranged in the vertical direction, and the number of each set of deep hole grouting hole sites is gradually increased from the side edge to the top. And an effective water stop area is formed within the grouting length range, so that sufficient grouting is guaranteed, and no dead angle is left. And a grouting pressure and grouting amount index double-control process is adopted, so that the slurry diffusion radius is uniform, the water stopping and reinforcing effects are good, the slurry vein of the excavation operation surface is clear, and the soil body stability of the excavation operation surface is ensured.

Description

technical field [0001] The invention belongs to the technical field of underground engineering construction, in particular to a large-section deep-hole grouting construction method in complex formations in water-rich areas. Background technique [0002] With the comprehensive development of urban municipal infrastructure in my country and the increase of subway lines, the environment that subways pass through is becoming more and more complex, the structure is buried deeper and deeper, and the treatment of groundwater is becoming more and more difficult. The original subway generally used precipitation to treat groundwater. In order to respond to the protection of water resources proposed by Beijing for the groundwater treatment policy during the construction of the subway project, minimize the precipitation of the project, optimize and adjust the important instructions for groundwater treatment measures during the construction period, and comprehensively sort out the groundw...

AI Technical Summary

Problems solved by technology

[0004] For complex formations, in the silty clay, clayey silt, silt layer, sand and pebble layer and the mixed section of each layer, the conventional deep hole grouting process has certain risks and uncertainties in the grouting effect

For example, if the grouting material is properly selected, the arrangement of grouting holes, the grouting angle and pressure are not properly controlled, there will be grouting blind spots in complex strata, mud and sand gushing will occur during tunnel excavation, and the excavation effect will be poor. Construction Schedule

Images