Basement reinforcement system of heavy-duty railway tunnel in water-rich soft stratum and construction method thereof

Abstract

The invention discloses a basement reinforcement system of a heavy-duty railway tunnel in a water-rich soft stratum and a construction method thereof, and belongs to the technical field of tunnel traffic engineering. According to the basement reinforcement system, a pile beam slab structure improves the overall rigidity of a track bed, bears the track bed and the load of trains, transmits the track bed and the load of the trains to a bottom bedrock, the track bed and the load of the trains act on the slab structure, and the track bed and the load of the trains are transmitted to the bedrock sequentially downwards through a longitudinal beam, a cross beam and a pile foundation, so that a reinforcement part and an original basement structure form a whole to work together and to be reinforced, and an inverted arch structure bears the surrounding rock pressure together with a tunnel arch wall to form a stable whole. According to the basement reinforcement system, a drainage pipeline is arranged on the inverted arch structure so as to remove accumulated water between an initial support and soil timely in the water-rich soft stratum geology, and the problem of mud pumping can be avoided.A construction method of the basement reinforcement system is low in cost and simple in process, the quality is easy to control, construction goals of maintenance-free and maintenance-less are realized, and economic and social benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of tunnel traffic engineering, and in particular relates to a base reinforcement system and a construction method for heavy-duty railway tunnels in water-rich and weak strata. Background technique [0002] Heavy-haul railways have the characteristics of large transportation capacity, high efficiency, and low cost. Therefore, heavy-haul railway transportation has become an important direction for the development of railway transportation today and has been widely used in the world. my country's "Medium and Long-Term Railway Network Planning" pointed out that accelerating the construction of coal transportation channels and the expansion and transformation of existing lines to form a heavy-duty railway transportation system with strong transportation capacity, advanced organization and perfect functions is of great significance to my country's economic development. To ensure the efficient and safe operation of...

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Problems solved by technology

[0005] At present, there are many methods used for tunnel base reinforcement, mainly conventional methods such as tunnel bottom grouting, replacement of tunnel bottom, and isolation treatment. Basal diseases occur repeatedly, and it is difficult to cure the basal diseases

At the same time, with the expansion and transformation of existing lines, conventional base reinforcement methods are difficult to meet the requirements of heavy-duty railways with large axle loads and high traffic density, and it is even more difficult to apply to heavy-duty railway tunnels in water-rich and weak strata. Conventional tunnel base reinforcement methods Due to defects such as inability to effectively improve the tunnel's bearing capacity and poor stiffness after reinforcement, it is difficult to meet the requirements of heavy-haul railways with large axle loads and high traffic density, and it is also difficult to apply to softening of the ground and decrease in bearing capacity under the disturbance of train cyclic loads. Tertiary strata of

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