A formulation of lubricating foam agent suitable for sand and pebble formation

Abstract

The invention discloses a lubricating foaming agent formula suitable for a sandy cobble stratum. The lubricating foaming agent formula comprises the following raw materials in percentage by mass: 1 to2 percent of sodium dodecyl benzene sulfonate, 2 to 4 percent of lauryl sodium sulfate, 1 to 2 percent of fatty alcohol-polyoxyethylene ether sodium sulfate, 1 to 2 percent of coconutt diethanol amide, and 90 to 95 percent of water, wherein the sodium dodecyl benzene sulfonate, the lauryl sodium sulfate and the fatty alcohol-polyoxyethylene ether sodium sulfate mainly play roles in foaming; the sodium dodecyl benzene sulfonate plays a role in improving the lubricating function of foam; the coconutt diethanol amide plays a role in stabilizing and reinforcing foaming. By adopting the lubricating foaming agent formula, the foaming rate can be increased, the lubricating property of the foaming agent is improved, the friction coefficient among sandy cobble stratums is lowered, and the frictionconditions between the gravel and a cutter tool as well as soil cabin are improved.

Description

technical field [0001] The invention belongs to the technical field of shield tunneling, and in particular relates to a lubricating foam formulation suitable for sand and pebble formations. Background technique [0002] When the earth pressure balance shield machine is used in sand and pebble formations, due to the friction between the pebbles, gravel and the cutter head, the cutter head will heat up and endanger the large bearing of the cutter head. There is a danger that the mechanism will be paralyzed in the formation, and at the same time, during the excavation process of the earth pressure balance shield tunneling in the water-rich sand layer, it is very easy to cause the spout of the excavation port and the problem that the excavation cannot be excavated. Based on the above two problems, when the earth pressure shield is constructed in the water-rich sand layer, it is necessary to use admixtures to improve the excavated soil. Contents of the invention [0003] Aimin...

AI Technical Summary

Problems solved by technology

[0002] When the earth pressure balance shield machine is used in sand and pebble formations, due to the friction between the pebbles, gravel and the cutter head, the cutter head will heat up and endanger the large bearing of the cutter head. The danger of the mechanism being paralyzed in the formation, and at the same time, the problem that the excavation cannot be excavated due to the gushing of the excavation opening is very likely to occur during the excavation process of the earth pressure balance shield tunneling in the water-rich sand layer