Excavation leakage-prevention supporting method for water-less sandy-soil stratum tunnel

Abstract

The invention discloses an excavation leakage-prevention supporting method for a water-less sandy-soil stratum tunnel. The excavation leakage-prevention supporting method includes the following steps: (1) drilling holes in an area required to be supported, (2) filling the holes with grass bags, namely carrying out reinforcing, and (3) then implanting small guide pipes into the holes, and filling the small guide pipes with grout to enable the grass bags and peripheral soil bodies to be combined into a whole. The excavation leakage-prevention supporting method is reasonable in design, simple in process and easy to construct, and compared with traditional grouting reinforcement, the characters of the tunnel soil bodies can be effectively improved through the technology. Due to the fact that the grass bags are added into the soil bodies, the friction effect between the soil and the grass bags is achieved, the soil with the grass bags has certain-degree cohesion force, the mechanical characters of the soil bodies are improved, the c values and the phi values of the soil bodies are improved in a disguised mode, and meanwhile the soil bodies have the certain tensile strength.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a method for excavating, leak-stopping and supporting for tunnels in less-water-sandy soil strata. Background technique [0002] In the construction of modern tunnel engineering, especially in the construction of soil tunnels (such as urban subways, loess tunnels, etc.). Compared with rock tunnels, due to the low strength of the soil itself, the ability to resist deformation is weak. Even if the commonly used new Austrian method is used for support, due to the low self-supporting capacity and poor stability of the soil, it is often necessary to use other methods first. Measures to increase the self-supporting capacity, and then support. Therefore, the soil tunnel support is more difficult, the construction is more difficult, and it is easy to cause disaster accidents. [0003] Straw bags, also called straw bags, are straw products made of rice straw as raw materia...

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