Silica sol reinforcement device and method for preventing shield machine from sinking in liquefiable sand

Abstract

The invention discloses a silica sol reinforcing device for preventing a shield tunneling machine from sinking in liquefiable sand. The device comprises a bending pipe jacking system, a silica sol injection system, a water pumping system and water separation plates; the bending pipe jacking system includes bending pipes perforated in the side edges; two rows of bending pipes are inserted in a foundation on two sides of an area where a shield tunnel is to be built; the silica sol injection system includes a silica sol solution injection main pipe, a first water pump and a silica sol storage container connected in sequence; the water pumping system includes a water pumping main pipe, a second water pump and a liquid storage pool connected in sequence; two rows of water separation plates are inserted in the foundation on two sides of the area to be built with the shield tunnel; a silica sol solution injection bending pipe is connected with the silica sol solution injection main pipe; and a water pumping bending pipe is connected with the water pumping main pipe. The device reinforces the liquefiable sand around the shield tunnel to be built through silica sol solution, is fast in permeation speed of the silica sol solution in the reinforcing process, is low in cost, is low in turbulence on surrounding environments, and can prevent vibration liquefication of the soil in the shield tunneling process to cause sinking of the shield tunneling machine after reinforcement.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering research, and in particular relates to a silica sol reinforcement device and a method thereof for preventing the subsidence of a shield machine in liquefiable sandy soil. Background technique [0002] As the scale of cities continues to expand, the construction of shield tunnels has become an indispensable part of the development of large and medium-sized cities. However, many large and medium-sized cities in my country are widely distributed with liquefiable soil. When the shield machine is propelled in the liquefiable foundation, due to the vibration of the shield machine to the soil, the soil liquefies and loses its shear strength, and the shield machine sinks in the liquefied soil layer. At present, the method to prevent the sinking of the shield machine in the liquefiable foundation is mainly to change the construction parameters during construction. For example, the initial elevation ...

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Problems solved by technology

Therefore, it can be considered to prevent the shield machine from settling by strengthening the liquefiable foundation. The conventional methods of strengthening liquefiable soil in engineering include crushing stone piles, replacing soil, and vibrating and compacting soil. Environmental impact is great, and shield tunnels are often surrounded by densely populated urban areas, so these conventional methods are not applicable

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