Slope stability determination method for slope geomechanical model and application

Abstract

The invention belongs to the technical field of slope stability evaluation, and discloses a slope stability determination method for a slope geomechanical model and the application thereof. A safety coefficient expression established by the method can reflect two factors of overload and strength reduction. The method is a multi-factor method and more accords with engineering practice. The method comprises the steps of deriving an expression of an overload method safety coefficient Ksp according to a lifting instability failure principle; obtaining an expression of a slope strength reserve coefficient Kss according to the weakening principle of the mechanical parameters of the slope structural plane, wherein Kss is related to the weakening degree of the mechanical parameters of the structural plane; and deriving a comprehensive method test safety coefficient expression Ksc = Ksp * Kss. Meanwhile, according to a deformation process control theory, slope deformation initial damage featurepoints and slope sliding surface penetration feature points are proposed to serve as two control feature points of a slope comprehensive method model test when the slope is overloaded and the strength of the slope is reduced, and serve as a basic basis for calculating a comprehensive method safety coefficient.

Description

technical field [0001] The invention belongs to the technical field of slope stability detection, and in particular relates to a slope stability detection method for a slope geomechanics model and an application thereof. Background technique [0002] At present, the closest existing technology: the core content of the study on the stability of high rock slopes mainly includes two aspects: one is to establish various formulas or models based on mechanical principles, and to find the minimum safety factor for slope stability; The second is to determine the position of the key block or slip surface corresponding to the corresponding minimum safety factor. Aiming at the above two core contents, through the unremitting efforts of many scholars and scientific research institutions, a basic theory based on "deformation process control theory" has been initially established. Especially in recent years, with the advancement of computer technology, modern mechanics and modern numeric...

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Problems solved by technology

[0007] To sum up, the existing problems in the prior art are: the method of using a centrifuge as a loading tool is only suitable for small-sized models, and for large-scale models with complex geological structures, it is limited by model processing accuracy, pasting of strain gauges and Due to the limitation of the number of installed displacement gauges, it has not been widely used

[0008] (1) The expressions of the overload safety factor in the prior art are not uniform, and the evaluation methods are somewhat different

[0009] (2) The existing overloading method only considers the overloading factor, and does not consider the adverse effects of the reduction of the mechanical parameters of the weak structural surface of the rock mass on the stability of the slope under the influence of rainfall, groundwater and other factors in the actual project

[0011] (1) Lack of theoretical basis and stability evaluation method for slope geomechanics model synthesis method test

[0012] (2) There is a lack of a physical model that can simulate the possible strength weakening behavior of weak structures in rock mass. The key technology is to develop model materials that can reduce the mechanical parameters of materials, and the process is controllable

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