Synchronous grouting slurry applicable to abundant water stratum tunneling and preparation method

Abstract

The embodiment of the invention provides synchronous grouting slurry applicable to abundant water stratum tunneling. The synchronous grouting slurry is composed of the following raw materials in partsby mass: 180-220 parts of Portland cement, 710-730 parts of machine-made sand, 710-730 parts of natural sand, 45-55 parts of bentonite, 3-6 parts of a retarder, 3-6 parts of a water reducing agent and 250-350 parts of water. The synchronous grouting slurry provided by the invention is added with an appropriate amount of machine-made sand and natural sand, so that the early strength of the productis improved, the product performance is improved, the voids inside the synchronous grouting slurry can be well filled, and the compactness is improved. The water cement ratio is reduced by adjustingthe content of the water reducing agent, and the strength of the synchronous grouting slurry is improved. Meanwhile, due to the addition of the appropriate amount of the retarder and bentonite, the concretion rate, horizontal slump and stability of the synchronous grouting slurry can be improved, the setting time is shortened, and the ground surface settlement and segment uplift can be effectivelycontrolled. Moreover, the raw materials of the synchronous grouting slurry provided by the invention are local materials and are readily available, and the material cost is reduced.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a synchronous grouting slurry suitable for shield tunneling in water-rich formations and a preparation method for synchronous grouting slurry suitable for shield tunneling in water-rich formations. Background technique [0002] The shield synchronous grouting technology refers to that in the process of shield tunneling construction, after the tunnel lining segments are assembled and the shield tail comes out, under a certain grouting pressure, an appropriate amount of grouting material with a certain early strength and final strength is injected. The grout material is filled into the gap behind the tail of the shield, and after it is consolidated and hardened, it can fill the building gap behind the wall and provide a certain bearing capacity to stabilize the grouting technology of the segment lining. Synchronous grouting is very important for controlling ground displa...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems of synchronous grouting slurry for shield tunneling in water-rich formations with long setting time, poor early strength, low calculus rate and poor stability in the prior art, the present invention provides a synchronous grouting slurry suitable for shield tunneling in water-rich formations. Synchronous grouting slurry has high early strength, stone rate, stability, fast setting time and low preparation cost

Images