Two-dimensional Safety and Stability Analysis Method of Embankment Slope Considering the Effect of Shield Crossing

Abstract

The invention relates to a method for analyzing the two-dimensional safety and stability of embankment slopes considering the influence of shield crossing. The analysis method obtains the stress diffusion angle of shield thrust in embankment foundation according to the principle of stress diffusion, and according to the most The reinforcement position of the unfavorable excavation surface determines the influence range of the shield construction, that is, the reinforcement range, and divides the influence range into several strips along the longitudinal direction of the embankment, and divides each strip into several soil strips; secondly, based on the Mindlin principle Through numerical integration, the additional sliding thrust from the shield extrusion at the sliding arc position of each soil bar on each strip is solved, and the arithmetic mean is applied to a certain strip; finally, the two-dimensional plane limit equilibrium is adopted According to the method, the safety and stability coefficient of embankment slope can be calculated and analyzed, and the comparison can be made according to relevant design standards and initial embankment safety and stability, so that the impact of shield tunneling construction on embankment safety and stability can be scientifically and quantitatively evaluated.

Description

technical field [0001] The invention relates to a simplified evaluation method for the safety and stability of dikes on weak foundations through shield tunneling, and belongs to the field of research on the influence and protection of underground engineering construction on the surrounding environment. This method transforms the local and three-dimensional problems of the influence of shield construction on embankments into plane problems for solution, and is easy to be understood, mastered, and flexibly applied by engineers and technicians who are familiar with two-dimensional slopes. The proposal of this method solves the problem of the lack of corresponding calculation methods and safety evaluation standards familiar to the majority of engineering and technical personnel when shield tunneling passes through embankments. Background technique [0002] At present, according to the relevant management regulations of river courses and embankment projects, shield construction a...

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Problems solved by technology

[0006] Technical solution: In order to solve the above technical problems, the analysis method of the present invention is to obtain the corresponding stress diffusion angle according to the properties of the foundation soil, and at the same time determine the shield according to the distance between the reinforcement position and the shield excavation surface which has the most unfavorable influence on the safety and stability of the embankment. The influence range of structural construction is taken as the reinforcement range of the embankment, and within the influence range, the range is divided into several strips along the longitudinal direction of the embankment, and each strip is divided into several soil strips; then, based on the Mindlin solution and Through numerical integration, the additional thrust of the shield extrusion at the sliding arc position of each soil strip in each strip is solved, and the additional thrust of the soil strip at the same position on each strip is added and divided by the number of strips, and at the same time On the soil strip corresponding to a certain strip, the three-dimensional problem of shield construction is simplified to a two-dimensional problem; finally, the additional thrust is substituted into the calculation formula of two-dimensional plane slope stability, and the embankment considering the influence of shield construction is obtained Safety and stability factor to evaluate the impact of shield construction on embankments

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