Synchronous grouting slurry for shield driving construction of water-enriched sandy gravel stratum

Abstract

The invention relates to synchronous grouting slurry for shield driving construction of a water-enriched sandy gravel stratum, which is used for synchronously grouting the stratum by using an earth pressure balance shield for the water-enriched sandy gravel stratum. The grouting slurry is prepared from the following components in percentage by weight: 8-8.8% of cement, 42-43% of river sands, 0.1-0.2% of polycarboxylate high performance water reducer, 4.5-4.7% of bentonite, 1.4-1.6% of yellow clay powder, 23-24% of coal ash and 19-20% of water. According to the slurry provided by the invention, by adding the polycarboxylate high performance water reducer, the use level of water in the equal flow condition is reduced, the use level of cement can be reduced under same strength by virtue of double effects of hydrophilicity and hydrophobicity of the polycarboxylate high performance water reducer, so that the initial setting time of the slurry is accelerated and the problem that the synchronous grouting slurry is separated within a short time is solved. The peaceability, the mobility and the set strength of the synchronous grouting slurry can be improved.

Description

technical field [0001] The invention relates to a synchronous grouting slurry for construction tunnel engineering, in particular to a synchronous grouting slurry for shield tunneling construction in water-rich sand and pebble strata. Background technique [0002] The earth pressure balance shield (EPB) utilizes the full-section cutting cutter head installed at the front of the shield to cut the front soil into the storage sealed chamber behind the cutter head, and make the chamber have proper pressure and excavation Surface water and soil pressure is balanced to reduce the disturbance of the ground soil caused by shield tunneling, thereby controlling surface settlement. When unearthed, the soil residue is continuously discharged to the soil discharge port by the screw conveyor installed at the lower part of the sealed chamber. [0003] During the excavation construction process of the earth pressure balance shield machine, the building gap between the main shield machine and...

AI Technical Summary

Problems solved by technology

[0011] (3) Solve the problem of segregation of synchronous grouting slurry in a short time, facilitate transportation, and ensure that the grouting pipeline is not blocked