A Method for Quickly Determining the Reinforcement Scheme for Shield Crossing Weak Foundation Embankment

A technology for weak foundations and embankments, which is applied in the field of rapid determination of reinforcement schemes for shield tunnels crossing weak foundations and embankments, can solve problems such as delays in construction period, exaggerated impact, and construction costs of large projects, and achieve the effect of clear physical and mechanical concepts and simple operation.

Active Publication Date: 2015-08-05
JIANGSU PROVINCE WATER ENG SCI TECH CONSULTING
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Problems solved by technology

Under normal circumstances, engineering water conservancy technicians lack experience in underground engineering and tunnel engineering construction. According to similar engineering experience, the possible impact of tunnel engineering construction is overly exaggerated, and often require expansion of reinforcement scope, which will increase the construction cost and even delay duration

Method used

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  • A Method for Quickly Determining the Reinforcement Scheme for Shield Crossing Weak Foundation Embankment
  • A Method for Quickly Determining the Reinforcement Scheme for Shield Crossing Weak Foundation Embankment

Examples

Experimental program
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Embodiment

[0019] A subway shield tunnel project crosses the Chuhe River, and the foundation is a deep muddy silty clay layer. The construction method adopts the earth pressure balance shield method with a diameter of 6.2m. The slope ratio of the embankment facing the water is 1:3, and the height of the embankment is about 10.0m. The minimum buried depth of the tunnel in the river is 6.0m. The compressive modulus of weak foundation soil is 2.0MPa, the strength parameter cohesion is 5kPa, and the internal friction angle is 10.1°.

[0020] Looking at the foundation code, it is concluded that under the condition of weak ground, the shield thrust force transmission and diffusion angle in the foundation is 30°. According to the calculation and analysis of the two-dimensional slope, it can be known that when the shield excavation reaches 28.0m before the bottom of the riverbed, the safety and stability of the embankment is the lowest, decreasing from 1.49 to 1.222 (as follows figure 1 shown...

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Abstract

The invention relates to a method for fast determining a strengthening scheme for a shield to pass through a soft foundation dike. The method is characterized in that the effect of the shield construction on the dike is fast determined through a two-dimensional plane side slope stability program, the position of a worst strengthening body is found out according to the stress transfer principle, the width of the strengthening body is worked out according to the stress transfer principle, the equivalent strengthening principle is utilized to ensured that the safety performance and stability of the dike are not reduced, anti-skidding force, borne for strengthening, of the strengthening body is worked out according to the two-dimensional plane side slope stability program, and on that basis, the thickness of the strengthening body is determined. The method has the advantages that the strengthening range can be prevented from being expanded at will in a man-made mode according to the equivalent strengthening principle, and therefore resources and materials cannot be wasted; meanwhile, the mechanics concept is clear and can be mastered by a project planner conveniently.

Description

technical field [0001] The invention relates to a method for quickly determining the reinforcement scheme of a shield passing through a dike on a weak foundation. This method adopts the principle of equivalent reinforcement, and considers the adverse influence of the thrust during the shield construction process on the safety and stability of the dike, and has a mechanical concept It is clear and easy to determine the method, which is convenient for hydraulic engineering technicians to quickly determine the reinforcement plan. It belongs to the field of protection of surrounding environment by underground engineering construction. Background technique [0002] At present, in view of the fact that the tunnel project crossing the embankment may have adverse effects on the embankment and flood discharge of water conservancy projects, flood impact assessment must be carried out to ensure the safety of embankment engineering and river flood discharge. Under normal circumstances,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/08
Inventor 颜红勤陈学东翟高勇高小琴任玉斌
Owner JIANGSU PROVINCE WATER ENG SCI TECH CONSULTING
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