Construction method for crossing of shield through sand and gravel backfill area

Abstract

The invention discloses a construction method for crossing of a shield through a sand and gravel backfill area. The construction method comprises the steps that before the shield crosses through the sand and gravel backfill area, through a sleeve valve pipe, reinforcing slurry with certain pressure is injected into the sand and gravel backfill area needing to be reinforced; when the shield conducts tunneling to be away from the sand and gravel backfill area by a certain distance, a shield cutterhead is overhauled, and it is ensured that the shield cutterhead enters the sand and gravel backfillarea in an intact state; the shield tries to conduct tunneling into the sand and gravel backfill area by a section of distance, tunneling parameters and change of the sand and gravel backfill area inthe tunneling trying process are monitored, and the tunneling parameters and modes suitable for the sand and gravel backfill area are obtained; and the shield crosses through the sand and gravel backfill area according to the obtained tunneling parameters and modes. According to the construction method, the filling effect of loess cement paste slurry in a loose peddle layer is good, clay cement slurry with sample cores visible partially wraps peddle, consolidation is good, certain strength is achieved, in the shield propelling process, the soil pressure can be built, and shield propelling safety is ensured.

Description

technical field [0001] The invention relates to the technical field of crossing construction of subway tunnels, in particular to a construction method for shield tunneling through sand and gravel backfill areas. Background technique [0002] With the continuous development of subway projects across the country, shield construction technology has been more and more widely used. In the construction of urban subway tunnels using the shield method, it is inevitable to have a certain degree of impact on the ground buildings (structures) along the line. During shield construction, it is necessary to ensure the safety of the construction tunnel itself and solve the problem of shielding. The impact on the adjacent existing buildings (structures) when the structure passes through the stratum. Especially when the subway tunnel adopts the earth pressure shield construction technology to pass through the special stratum in the sand and pebble backfill area, due to the complex compositi...

AI Technical Summary

Problems solved by technology

However, there is no domestic subway tunnel construction in the sand and gravel backfill area, and there is no in-depth research on the construction of shield tunneling through the sand and gravel backfill area.

[0004] However, it is a very complicated problem for shield tunneling through the sand and gravel backfill area, and there are very few related researches in China at present, and there are many topics worthy of research, such as reasonable soil reinforcement methods, shield cutter head selection, shield parameter control, etc. These are subject to further research

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