Rapid treatment method for collapse of urban subway tunnel crossing water-rich sand layer section

Abstract

The invention relates to a rapid treatment method for the collapse of an urban subway tunnel crossing a water-rich sand layer section. The rapid treatment method for the collapse of the urban subway tunnel crossing the water-rich sand layer section comprises the following steps of (1) arranging a fence around a surface collapse area; (2) filling a concrete in the surface collapse area so as to form a concrete protection layer; (3) arranging deformation monitoring points on a ground surface; (4) filling and grouting in an area below the concrete protection layer, and filling a cavity under theconcrete protection layer; (5) grouting and reinforcing a whole collapse body, and blocking gushing water on a tunnel face in the tunnel; (6) after the gushing water on the tunnel face in the tunnel is disappeared, backfilling an area between flooders on one side of the tunnel face in the tunnel and a tunnel lining, and back-pressing the flooders; and (7) grouting and reinforcing a peripheral region of a tunnel part corresponding to the collapse body, and forming a reinforcing ring structure located on the periphery of the tunnel. The treatment method provided by the invention is fast in construction speed and good in safety.

Description

technical field [0001] The invention relates to the technical field of tunnels and underground engineering, in particular to a rapid treatment method for landslides in urban subway tunnels passing through water-rich sand layers. Background technique [0002] Urban subway tunnels usually have a shallow buried depth. When they pass through the Quaternary water-rich sand layer, due to the strong water-rich sand layer, loose structure, and poor bonding ability, sand collapse accidents are very likely to occur during tunnel excavation. , a large amount of sand and water mixture poured into the tunnel from the sand breakout on the face of the tunnel. When the scale of the sand break and landslide accident is large, the landslide often develops to the surface to form a surface subsidence, which seriously affects the safety of tunnel excavation and urban traffic operation, and causes Serious adverse social impact. [0003] The landslide hazards of urban subway tunnels passing throu...

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Problems solved by technology

[0004] Tunnel landslides can be dealt with by methods such as in-cave treatment and open-cutting. The in-cave treatment usually first strengthens the existing tunnel support, then stabilizes the collapsed body through advanced small conduits or advanced large pipe sheds, and finally backfills and repairs the collapsed parts. It was discovered that secondary sand collapses and landslides may occur at any time in the water-rich sand layer and water gushes continuously on the face of the tunnel, so the treatment in the cave cannot guarantee the safety of personnel and equipment, and the construction risk is too high

The open cut method excavates the landslide body directly on the surface. Due to the constraints of the urban environment, the underground diaphragm wall, bored piles and internal supports are generally used for excavation construction. The inventor found that the construction period of this method is long, and the sand collapse The disaster may continue to develop during the construction period, and the municipal pipeline is in a state of settlement for a long time, so it is difficult to guarantee safety during the construction period

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