Construction method of expansive soil stratum shield underneath pass railway track

Abstract

The invention discloses a construction method of an expansive soil stratum shield underneath pass railway track. The construction method comprises the steps that engineering is simulated through finite element analysis software; an expansive soil body is improved; a plate-shaped isolation foundation is poured below the rail; an erecting device is arranged; the ground and the shield are grouted. According to the invention, the purposes of protecting the track and reducing the influence between the track and the shield can be achieved.

Description

technical field [0001] The invention relates to the technical field of shield tunneling structure construction, in particular to a construction method for tunneling a railway track by a shield tunneling in an expansive soil layer. Background technique [0002] With the rapid development of underground transportation in our country, domestic subway projects are facing some technical problems. At present, the shield tunneling method has become the preferred tunnel construction method in the field of underground engineering. There are many project cases where the shield machine passes under the railway line. It is important. For underground engineering in expansive soil layers, the development of the project has certain challenges. When the soil loses water excessively, its volume begins to shrink and cracks occur; conversely, when the soil moisture of expansive soil increases , the soil will expand and generate a pressure, which will easily cause water gushing and cause the e...

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Problems solved by technology

At present, the shield tunneling method has become the preferred tunnel construction method in the field of underground engineering. There are many project cases where the shield machine passes under the railway line. It is important. For underground engineering in expansive soil layers, the development of the project has certain challenges. When the soil loses water excessively, its volume begins to shrink and cracks occur; conversely, when the soil moisture of expansive soil increases , the soil will expand and generate a kind of pressure, which will easily cause water gushing and cause the excavation surface to be unstable, which will eventually have a greater impact on the safety of the tunnel and related buildings

Moreover, most domestic construction methods for shield tunneling projects are to control shield construction parameters, grouting, etc., and the effect is not good

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