Calculation Method of Mechanical Parameters of Landslide Sliding Surface Based on Field Direct Shear Test

Abstract

The invention discloses a method for calculating mechanical parameters of landslide sliding surfaces based on field direct shear tests, and relates to field direct shear test techniques in the field of mechanics. The present invention mainly comprises the following steps: 1. carry out the on-the-spot direct shear test of relevant landslide sliding surface under natural condition or saturated condition, draw the relationship curve of shear stress and deformation; 2. obtain a hyperstatic equation group; 3. establish about An objective function based on the least square criterion of cohesion and internal friction angle; ④Introduce the particle swarm optimization algorithm into the objective function, and the obtained cohesion and internal friction angle values ​​are the mechanical parameter values ​​of the sliding surface. The invention can not only effectively reduce the influence of abnormal values ​​in the test, improve the speed and accuracy of determining landslide mechanical parameters, but also has a simple principle and calculation method, which is beneficial to engineering promotion; it is suitable for highways, railways, mines, reservoir areas, etc. Solving landslide parameters in many projects and related fields.

Description

technical field [0001] The invention relates to field direct shear test technology in the field of mechanics, in particular to a method for calculating mechanical parameters of landslide sliding surfaces based on field direct shear tests. Background technique [0002] Landslides are widely distributed on the surface of the lithosphere, and many countries in the world have suffered damage to varying degrees in economic construction. Alpine countries in Europe, such as Italy, Austria, Switzerland, the Czech Republic, Britain and Russia, are countries with serious landslide disasters. In North and South America, landslides in Canada, Chile and other countries are also widely distributed. In Asia, Japan, India and China are countries with more landslides. [0003] Some major landslide disasters occurred in the world in the last century, which brought painful lessons to mankind. In 1963, about 2,600 people died in a landslide on the shore of the Vaion Reservoir in Italy; in 19...

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Problems solved by technology

Practice shows that: the point group center method has great arbitrariness, especially when there are too few data points; although the optimal slope method takes into account the comprehensive factors affecting the shear strength, it does not affect the given cohesion c, Angle of internal friction Whether the value is optimal, its fluctuations, and the correlation of the regression equation cannot be explained; the random-fuzzy method takes into account the randomness and fuzziness of the sample, but the calculation is complicated, and it is difficult to be widely used in engineering practice; the least square method is currently The most widely used method for calculating the mechanical parameters of sliding surfaces has better accuracy than the point group center method and the optimal slope method, and the calculation is relatively simple, but this method is greatly affected by outliers

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