Method for obtaining deformation failure mechanism of freeze-thawed single-fracture dacite

Abstract

The invention provides a method for obtaining a deformation failure mechanism of freeze-thawed single-fracture dacite, and relates to the technical field of freeze-thawed rock. The method comprises the steps of using similar materials for preparing a single fracture surface test sample to simulate dacite with fractures; carrying out freeze-thaw circulation on the single fracture surface test sample; measuring to obtain basic physical parameters of the freeze-thaw single fracture surface test sample; carrying out a uniaxial compression test or a conventional triaxial test on the freeze-thaw single fracture surface test sample to obtain the mechanical indexes of the freeze-thaw single fracture surface test sample; according to basic physical parameters and mechanical indexes of the freeze-thaw single fracture surface test sample, establishing a system research on the physical and mechanical properties of the freeze-thaw fracture dacite to acquire the deformation failure mechanism of thefreeze-thaw fracture dacite. A theoretical support is provided for solving the problems existing in a cold region engineering project.

Description

technical field [0001] The present application relates to the field of freeze-thaw rock technology, in particular to a method for obtaining the deformation and failure mechanism of freeze-thaw single-crack dacite. Background technique [0002] my country is currently one of the countries with the largest distribution of permafrost in cold regions in the world. In recent years, in order to meet the needs of national development, more and more hydropower, road, energy and other engineering projects are located in cold regions. The development of these projects In the course of construction, construction and operation, many engineering geological problems are bound to be faced. For example, the surrounding rock of the Dabanshan Highway Tunnel ruptured or even became unstable due to the frost heaving effect of groundwater; To solve the problems existing in engineering projects in cold regions, it must be based on the understanding of rock engineering characteristics under the sp...

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Problems solved by technology

[0003] However, the current research objects of engineering problems in cold regions are generally intact rocks, and there is a lack of freeze-thaw research on rocks.

Therefore, based on the current research on rocks in cold regions, there is no systematic study on the freeze-thaw cycle of rocks, and there is no unified understanding of the change law of physical and mechanical properties with the number of freeze-thaw cycles. The deformation and failure mechanism of rocks cannot provide theoretical support for solving problems in engineering projects in cold regions

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