Method for dike side slope two-dimensional safety and stability analysis taking shield pass-through influences into consideration

Abstract

The invention relates to a method for dike side slope two-dimensional safety and stability analysis taking shield pass-through influences into consideration. The method for dike side slope two-dimensional safety and stability analysis includes the steps that based on the stress dispersion principle, a stress dispersion angle of shield thrust in a dike foundation is acquired, the range of influence, namely the reinforcement range of shield construction is determined according to the reinforcement position of an excavation face which is most unfavorable to dike safety and stability, the range of influence is divided into a plurality of stripes in the longitudinal direction of a dike, and each stripe is divided into a plurality of soil stripes; based on the Mindlin principle, through numerical integration, additional gliding thrust transmitted by shield extrusion on the slip circle position of each soil stripe on each stripe is acquired, and the additional gliding thrust is applied to one certain stripe through arithmetic averaging; finally, according to a two-dimensional plane limit equilibrium method, dike side slope safety and stability coefficients can be calculated and analyzed, comparison is conducted according to relevant design standards and initial dike safety and stability, and therefore the influences of shield construction on dike safety and stability can be scientifically, quantitatively and reasonably 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 adverse impact on the safety and stability of the embankment. The scope of influence of structural construction is taken as the reinforcement scope of the embankment, and the scope of influence is divided into several strips along the longitudinal direction of the embankment; at the same time, based on the Mindlin solution and through numerical integration, the soil of each strip is obtained by solving The additional thrust of the shield extrusion at the sliding arc position of the strip, 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 applied to the soil strip corresponding to a certain strip at the same time, so that The three-dimensional problem of shield construction is simplified to a two-dimensional problem; finally, the additional thrust is added to the calculation formula of two-dimensional plane slope stability, and the safety and stability coefficient of the embankment considering the impact of shield construction is obtained, and the impact of shield construction on the embankment is evaluated. influences

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