A kind of soil improvement material for earth pressure balance pipe jacking in anhydrous sand layer

Abstract

The invention relates to a muck improvement material for earth pressure balance pipe jacking in an anhydrous sand layer, which consists of a modifier and a filler, wherein the modifier is uniformly mixed and stirred by bentonite, loess, external admixture and water , and, described bentonite is sodium-based bentonite, loess is Q3 loess, external admixture is polyacrylamide (PAM) and water glass, and the mass ratio of each component of modifier is: sodium-based bentonite: Q3 loess: polyacrylamide (PAM): water glass: water=50~70:30~40:1~2:20~30:1000; the filler is made by mixing and stirring loess and water, and the loess is Q3 loess, and The mass ratio of each component of the filler is: Q3 loess: water = 1:0.8~1. The application of the present invention can effectively improve the improvement effect of the dregs cut off from the face of the tunnel in the soil cabin during the construction of pipe jacking in the water-free sand layer, effectively reduce the settlement displacement of the soil in front of the tunnel face, and have great influence on the construction of pipe jacking projects. positive meaning.

Description

technical field [0001] The invention relates to a material for pipe jacking construction and a preparation method thereof, in particular to a dreg improvement material for pipe jacking with earth pressure balance in an anhydrous sand layer, which is mainly used for slag in an anhydrous sand layer for earth pressure balance pipe jacking construction soil improvement. Background technique [0002] With the rapid development of domestic urbanization, due to the limited space above ground, underground space has been widely developed and utilized. Underground pipelines and underground passages have become an important part of the intricate network system of modern cities. The construction of urban underground pipeline network and underground transportation lines usually adopts two methods: open-cut construction and underground construction. Open-cut construction usually leads to damage to urban road surfaces, traffic congestion, and various environmental problems such as urban g...

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Problems solved by technology

At present, there is no relevant research on the materials and preparation methods of the muck modifier used in pipe jacking construction in anhydrous sand layers in China. The ingredients, proportions and preparation methods used in the construction are completely determined by experience, and there is no test data support. , the improvement effect on the dregs cut off from the face of the face during pipe jacking construction in anhydrous sand layers is poor, and it is difficult to discharge soil from the soil tank, and the pressure in the soil tank is high, which is prone to uplift

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