Soil layer slope stability determining method based on orthogonal strain ratio

Abstract

The invention relates to a soil layer slope stability determining method based on an orthogonal strain ratio. The method comprises the following steps: step one, determining a slope most dangerous slip plane; step two, arranging a slope orthogonal strain monitoring grid; step three, performing monitoring and data recording on vertical and horizontal strain at each monitoring grid node; step four, determining a slope monitoring grid orthogonal strain ratio parameter; step five, determining a slope orthogonal strain ratio stability criterion and a slip plane plastic zone; step six, determining a slope body damage variable and a damage variable critical value; step seven, analyzing and evaluating slope overall stability; and step eight, determining a slope overall slip plane. The method provided by the invention can accurately determine a slope plastic zone and evaluate the slope stability, and has an important engineering application value in slope stability and land slide geological disaster monitoring early warning and control.

Description

technical field [0001] The invention relates to the technical field of slope stability evaluation and landslide geological disaster monitoring and early warning, in particular to a soil layer slope stability evaluation method based on rock-soil mass orthogonal strain ratio parameters. Background technique [0002] my country is one of the countries with the most severe landslide disasters in the world. Its landslide disasters have the characteristics of wide distribution and high frequency of occurrence. For a long time, they have caused huge losses to my country's industrial and agricultural production and people's lives and property, and some are even devastating disasters. . With the rapid development of social economy in recent years, more and more large-scale projects are being built, resulting in a gradual increase in the scale and frequency of landslide disasters. one. Due to the influence of comprehensive factors such as slope geometry, soil parameters, and differen...

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Problems solved by technology

However, the displacement prediction parameter used in this method is a monitoring and evaluation parameter that is easily disturbed by external factors and causes oscillations and multi-phase accelerated step-like oscillation changes, and this acceleration step-like oscillation change of displacement does not necessarily represent the slope. Decreased stability or overall instability of the landslide. In addition, there is no unified instability criterion for the displacement prediction parameters of this type of method, and the critical instability displacement value varies with the scale of the slope, rock and soil type and other factors, so it cannot be based on Its critical instability criterion can accurately judge and predict the occurrence time of landslide disasters

In addition, this type of method mainly monitors the change of the deep displacement of the borehole, and monitors the emergence of the slope slip surface at any time according to the sudden change of the displacement. However, the sudden change of the displacement does not necessarily indicate the emergence of a plastic zone on the slope. The sudden change of the reservoir water level) can also cause the sudden change of its displacement, so there is a certain probability and uncertainty in determining the slope slip surface solely by displacement parameters

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