Soil reinforcement system at the end of shield tunnel in the area of ​​high water head and deep sand layer

Abstract

The invention provides a shield end socket soil body reinforcing system of a high water head deep and thick sand layer region. The shield end socket soil body reinforcing system comprises a shield end socket well located at the end of a shield tunnel and a main body enclosure structure on the periphery of the shield end socket well. A reinforcing zone is arranged on the side, close to the tunnel, of the main body enclosure structure. The shield tunnel penetrates through the reinforcing zone. The system is characterized in that the system further comprises a waterproof curtain; the waterproof curtain is arranged in a soil body outside the reinforcing zone in a surrounded mode; and seam joints of the two ends of the waterproof curtain and the main body enclosure structure are closed through connector jet grouting piles. Through the system, the risks of water bursting and sand bursting in the soil body in the shield tunnel entering and exiting processes in the high water head deep and thick sand layer region are reduced.

Description

technical field [0001] The invention belongs to the engineering fields of rail transit engineering, municipal roads, comprehensive pipe corridors, etc., and in particular relates to a soil reinforcement system at the end of a shield machine in areas with high water head and deep sand layers. Background technique [0002] In subway engineering, the shield method is a common method for interval tunnel construction. The departure and arrival of shield tunneling are two key nodes in the construction process of shield tunneling, and they are also important and difficult points in construction. Shield end reinforcement usually adopts vertical grouting, rotary jet reinforcement or horizontal freezing method. The uniformity of the reinforced body formed by vertical grouting and rotary spray reinforcement is poor, and there will be water leakage, sand leakage and other phenomena, which will affect the overall quality of the reinforced soil, and the strength of the local soil will no...

AI Technical Summary

Problems solved by technology

The uniformity of the reinforced body formed by vertical grouting and rotary spray reinforcement is poor, and there will be water leakage, sand leakage and other phenomena, which will affect the overall quality of the reinforced soil, and the strength of the local soil will not meet the design index or construction requirements. A landslide occurs, which threatens the safety of the shield when entering and exiting the hole

When the horizontal freezing method is used for reinforcement, the frost heaving and thawing caused by the frozen reinforcement are difficult to control and have a great impact on the surrounding environment

In addition, when the horizontal freezing method is adopted, it is necessary to construct freezing pipes on the end wall of the station. The construction of the freezing pipes will cause damage to the side walls and waterproof layer of the station, affecting the structural safety and waterproofing effect of the station.

In addition, compared with vertical reinforcement, the freezing method increases the cost more and is less economical.

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