Equal-precision safety coefficient calculation method and mesh generation method for any-scale side slopes

Abstract

The invention discloses an equal-precision safety coefficient calculation method for any-scale side slopes. The method comprises the steps of acquiring a theoretical value of the safety coefficient ofthe side slopes; calculating a slope safety coefficient relative value under the target error; calculating to obtain a grid height; changing the slope height of the calculation model, and repeating the steps to obtain a relative slope height ratio for slope stability analysis under a target error at any slope height; changing the slope angle of the calculation model, and repeating the steps to obtain the relative slope height ratio for slope stability analysis under the target error at any slope angle; and calculating according to the relative slope height ratio data to obtain an equal-precision safety coefficient of the slope of any scale. The invention further discloses a mesh generation method comprising the equal-precision safety coefficient calculation method for the side slope of any scale. According to the method, the slope safety coefficient can be accurately calculated theoretically, multi-scale slope stability and other precision analysis can be achieved, and the method is simple, easy to operate, high in reliability, good in practicability, simple and easy to implement.

Description

technical field [0001] The invention belongs to the field of civil engineering, and in particular relates to a calculation method and a grid division method of equal-precision safety factors of slopes with arbitrary scales. Background technique [0002] Slope stability has always been a research hotspot in the field of geotechnical engineering. The finite difference strength reduction method is a method that gradually rises with the improvement of computer performance, and is widely accepted and adopted by geotechnical engineers and experts because of its simplicity, rapidity, and effectiveness. But in fact, the strength reduction method also has many problems in practical engineering applications. One of the key problems is the calculation accuracy of multi-scale slope stability. [0003] In general, the scale parameters of engineering slopes, such as slope height and slope, are complex and changeable, and there are many uncertainties, which can directly affect the calcula...

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Problems solved by technology

[0003] In general, the scale parameters of engineering slopes, such as slope height and slope, are complex and changeable, and there are many uncertainties, which can directly affect the calculation results of slope stability

However, in previous studies on slope stability, the grid shape and size division of the calculation model were often determined artificially, lacking a certain basis. Therefore, the calculation of the safety factor has a certain degree of subjectivity, and the accuracy is difficult to guarantee.

On the other hand, for the stability analysis of slopes of different scales, if the model uses the same numerical calculation grid, it will have different effects on the calculation results, resulting in different accuracy of the calculation results, making them incomparable

According to statistics, among the 235 slope failures recorded in 46 large-scale open-pit mines in China, the overall slope failure accounted for 6%, and the step slope and combined step slope failure accounted for 94%, with a ratio of 1:15; Among the stability evaluation results of 571 slopes in 1042 small and medium-sized open-pit mines in Zhejiang Province, 4.96% of the overall slopes are unstable, and 55.1% of the stepped slopes are unstable. The ratio of the two is 1:11. The fact that the overall slope is generally safe, and the stepped slope or combined stepped slope is generally unsafe shows that the traditional method of evaluating the stability of slopes of different scales using the safety factor standard obtained by the same calculation grid has yet to be perfected.

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