Method for quantitatively analyzing influence of environmental factors on mechanical properties of coal-series mudstone

Abstract

The invention belongs to the field of rock mechanics experiments. The invention relates to a method for quantitatively analyzing influence of environmental factors on mechanical properties of coal-series mudstone. Coal, calcium bentonite, quartz sand, cement and water are selected as raw materials to prepare coal-series mudstone samples, remolded rock samples highly consistent with natural coal-series mudstone in expansibility, water absorbability and basic mechanical properties are prepared in batches at a low cost, and rock mechanics experiments can be conveniently carried out. By controlling single environmental variables (including environmental temperature, environmental water pressure and soaking time), a large batch of homogeneous test pieces with similar field mechanical propertiesare used for carrying out grouped cross tests, the influence degree of a single factor on the deformation and mechanical properties of the coal-series mudstone is quantitatively analyzed, and a curveand a parameter equation with clear reference values are obtained.

Description

technical field [0001] The invention belongs to the field of rock mechanics experiments, and relates to a method for quantitatively analyzing the influence of environmental factors on the mechanical properties of coal measure mudstone. Background technique [0002] Coal-measure carbonaceous mudstone is a kind of sedimentary rock series associated with coal seams. The lithology changes greatly, and it has the characteristics of softening and swelling when it encounters water. The research shows that: the water content of the rock mass seriously affects the various mechanical parameters of the rock, and the effect of water on the rock mass has a time effect. When the water content of the rock continues to increase, the decline in the compressive strength of the rock increases significantly, the rock begins to crack and expand, and the strain softening phenomenon decreases sharply. The higher the temperature, the weaker the maximum stress and strain of the mudstone; the elasti...

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Problems solved by technology

[0007] In view of this, in order to solve the above-mentioned mudstone rock sample remodeling process, the present invention cannot prepare experimental rock samples in batches, and the mudstone rock samples after batch remodeling cannot highly restore the mechanical properties of on-site carbonaceous mudstone and cannot use homogeneous, highly Restore the mechanical properties of coal-measure mudstone rock samples by artificially reshaping mudstone rock samples to conduct quantitative analysis on the influence of single factors on the deformation and mechanical properties of coal-measure mudstone, and provide a method for quantitative analysis of the influence of environmental factors on the mechanical properties of coal-measure mudstone

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