Construction method of shield tunneling through the existing railway station building in expansive soil layer

Abstract

The invention belongs to the technical field of shield tunneling, and in particular relates to a construction method for shield tunneling through an expansive soil layer through an existing railway station building. Firstly, an exploration is carried out on the underpassed railway station building, which is convenient for reference in subsequent construction; secondly, a measuring device is arranged. , to detect the ground surface settlement around the shield interval, the settlement of the shield segment vault and the surrounding convergence, the ground pressure of the shield tunnel, the horizontal displacement of the soil, the settlement and deformation of the ground building; again, set the shield parameters, through accurate calculation The soil pressure on the face of the tunnel can be determined to determine the soil pressure of the shield machine, and by determining the maximum soil layer loss, under-excavation and over-excavation can be prevented, so that the soil pressure on the face of the tunnel can be maintained in balance during the process of passing through the railway station building, and avoid The shield construction affects the stress of the soil layer; the disturbance of the shield construction to the surrounding soil layer is reduced by setting the speed of the shield tunneling machine and the amount of correction; finally, as the shield tunneling progresses, inject synchronous injection pulp material.

Description

Technical field [0001] The present invention belongs to the field of shield construction technology, and is specifically involved in an expansion soil shield through a construction method of both a railway station. Background technique [0002] The shield method has a small vibration, low noise, fast construction progress, reliable operation, high installation accuracy, reliable lining, good waterproof performance, small surface settlement, less venue, and life along the land, underground ground The advantages of small structures or buildings affect. At present, the shield method has become an important optional tunnel construction method in the field of cross-river projects and underground tunnels in my country, and many occasions have become preferred and even unique methods in many occasions. [0003] Since the completion of Beijing Metro Line 1, my country has built or built a subway, with more and more rail transportation construction, the construction environment has become...

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Problems solved by technology

[0003] Since the completion of Beijing Subway Line 1 in my country, more and more cities have built or are building subways in China. With the construction of more and more rail transit, the construction environment has become more complicated. Intersecting constructions between stations have also occurred one after another. At present, the subway crosses the railway station mainly through the station road, etc., and there is no construction example of the shield tunneling through the railway station building. The impact of the surrounding environment and the safety of the upper structure of the operating station building are the problems that need to be solved during the construction process

[0004] Due to the early construction of the railway station building, there is a soft and hard uneven soil layer under it. During the shield excavation process, the main engine has the inertia to shift to the softer side of the stratum, and encounters the expansive soil stratum with a high natural moisture content. It is easy to cause water gushing and make the excavation surface unstable, which in turn affects the safety of the upper buildings and the tunnel itself. The current existing construction methods cannot accurately control the pressure of the soil bin and the loss of the soil layer; it is impossible to accurately grasp the impact on the ground buildings. degree and impact; there is no guarantee that shield tunneling will not have an impact on groundwater; therefore, how to control construction parameters is a difficult problem that must be faced in the preliminary research

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