Shield end soil body ultra-deep reinforcement construction method under water-rich silty-fine sand geology

Abstract

The invention discloses a shield end soil body ultra-deep reinforcement construction method under water-rich silty-fine sand geology. The shield end soil body ultra-deep reinforcement construction method comprises the following steps of pile forming test, preparation before construction, in-place of a stirring machine, slurry preparation, drilling grouting, lifting stirring, repeated up-down stirring and acceptance check. According to the shield end soil body ultra-deep reinforcement construction method under the water-rich silty-fine sand geology, soil body reinforcement is conducted throughultra-deep three-axis stirring piles, the ultra-deep three-axis stirring piles are additionally arranged on the outer sides of reinforcing bodies to serve as waterproof curtains and are used for preventing underground water and sand outside a foundation pit from gushing into an end well in the station entering and exiting period of a shield tunneling machine, the phenomena of water gushing and sand gushing which are most likely to happen in the in-out hole process of the shield tunneling machine are greatly reduced, and therefore the risk of shield tunneling in-out hole in a full-section siltlayer is eliminated.

Description

Technical field[0001]The invention belongs to the field of construction, and particularly relates to a construction method for super-deep reinforcement of the soil at the end of a shield tunnel under water-rich silt fine sand geology.Background technique[0002]With the advancement of urbanization construction and the maturity of shield technology, in the three-dimensional development of urban space, the application of shield method in tunnel engineering is increasing. The consequent safety risks caused by shield tunneling in and out of tunnels under adverse geological conditions have gradually attracted the attention of the entire industry. How to carry out effective soil reinforcement to ensure the safety of shield tunneling in and out of tunnels is worth exploring The field of development.[0003]In today's industry development and technical background, there are many alternatives for ultra-deep soil reinforcement and water-stop curtain construction under bad geology. Among them, the...

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Problems solved by technology

Among them, the construction of triple high-pressure rotary grouting piles, as a conventional soil reinforcement method, has its fatal flaws under the geological conditions of water-rich powder and fine sand layers, that is, the pile diameter cannot be effectively guaranteed, and due to the large permeability coefficient under the geological conditions of the soil layer, it is easy to Causes the cement slurry to lose and loosen the reinforced soil