Treatment structure of high-water-level soft soil bridgehead roadbed and construction method

Abstract

The invention discloses a treatment structure of a high-water-level soft soil bridgehead roadbed that comprises buoyancy bodies that are arranged below the underground water level of a soft soil layerand are made of waterproof materials with the volume density not larger than 1.0 g / cm < 3 >, wherein the multiple buoyancy bodies are arranged in the passing direction of a road at intervals, and each buoyancy body is horizontally arranged in the width direction of the road; the upper portion of each buoyancy body is provided with one jacking pipe, the jacking pipes and the buoyancy bodies are horizontally arranged in the same direction, each jacking pipe is of a half-pipe structure with an opening in one side, and the openings of the jacking pipes are buckled to the upper surfaces of the buoyancy bodies; and a rigid connecting body is connected between the two adjacent jacking pipes. According to the treatment structure, a corresponding using method is adopted, differential settlement ofhigh-water-level soft foundation bridgehead roadbeds of a newly-built road and an existing road can be effectively treated, and the problem of bridgehead bumping caused by differential settlement issolved.

Description

technical field [0001] The invention relates to the technical field of anti-subsidence treatment of deep and thick soft ground strata in civil engineering, in particular to a treatment structure and construction method of high-water level soft soil bridge head embankment. Background technique [0002] In areas with deep soft foundations, the soil layer usually has the characteristics of high compressibility, low strength, low permeability, slow consolidation, and high sensitivity. When building roads on this basis, if effective measures are not taken for the underlying soft For treatment, under the action of the embankment load on it, the soft soil layer is consolidated and compressed, resulting in a large settlement, which has a great impact on the safety and comfort of the later operation. [0003] Especially in the subgrade section at the bridge head, because the bridge pile foundation is often supported on the hard bearing layer below it, no settlement will occur after c...

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Problems solved by technology

[0004] However, if the thickness of the soft foundation is relatively large (thickness reaches 50-60m) and the groundwater level is relatively high, according to theory, the deformed compression layer (the stratum with additional stress less than or equal to 0.1 times the self-weight stress) is relatively thick, and the treatment of the transition section of the bridgehead should be set. It is difficult to implement this method in this environment, and conventional treatment measures such as: drainage consolidation body + surcharge preloading, powder jetting piles, high-pressure rotary jetting piles, prestressed pipe piles, etc., are also impossible to completely remove the deformed compression layer. Therefore, in actual construction, it is often only possible to deal with 0.3-0.6 times the thickness of the compressed layer. In addition, it is difficult to control the construction quality. After completion, there will still be a large amount of post-construction settlement, resulting in serious bridge head jumping.

[0005] Therefore, none of the existing treatment measures can achieve satisfactory results for the anti-differential settlement treatment of such high-water level soft foundation bridge head subgrades.

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