Freezing and in-hole grouting improved combined bearing stratum reinforcement scheme

Abstract

The invention discloses a freezing and in-hole grouting improvement combined bearing stratum reinforcement scheme. The scheme comprises the following steps that an underground tunnel to be constructed and a freezing wall are designed, the position of a grouting improvement soil layer is determined, grouting construction is carried out, then freezing construction is carried out, and finally excavation is carried out. The large underground engineering is divided in a miniaturized mode, the engineering risk of the long-distance horizontal underground excavation engineering can be effectively reduced, the volume of each excavation section is small, even if a soil layer collapses during excavation, the collapse amount is small and is within a controllable range due to the effect of improving the soil layer through grouting, and the construction safety is improved; during excavation, even if one grouting improved soil layer collapses, the other grouting improved soil layers can still play a role in supporting, water sealing and bearing; the multiple grouting improved soil layers are matched with one another, the joint supporting effect can be achieved, and therefore the pressure of the water-rich soft soil layer is dispersed, the situation that the pressure of a certain position is too high is avoided, and the construction safety is improved.

Description

technical field [0001] The invention relates to the technical field of underground engineering reinforcement. Specifically, it is a combined load-bearing stratum reinforcement scheme improved by freezing and grouting in the cave. Background technique [0002] When the existing underground space structure cannot meet the needs of use, the underground space structure is usually expanded, and the soil layer needs to be reinforced during expansion to ensure normal excavation. Especially in the expansion of long-distance horizontal tunnels in the water-rich soft soil layer, due to the high water content and poor stability of the water-rich soft soil layer, it is difficult to use conventional construction methods for reinforcement and excavation, and it is easy to cause collapse. There is a high risk. SUMMARY OF THE INVENTION [0003] Therefore, the technical problem to be solved by the present invention is to provide a stratum reinforcement scheme that is suitable for expansi...

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Problems solved by technology

[0002] When the existing underground space structure cannot meet the needs of use, the underground space structure is usually expanded, and the soil layer needs to be reinforced during the expansion to ensure normal excavation

Especially in the expansion of long-distance horizontal tunnels in the water-rich soft soil stratum, due to the high water content and poor stability of the water-rich soft soil stratum, there are great difficulties when using conventional construction methods for reinforcement and excavation, and collapse is easy to occur. There is a higher risk

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