Preparation method of true triaxial sample for reflecting occurrence characteristics of weak intercalated rock mass

Abstract

The invention provides a preparation method of a true triaxial sample reflecting occurrence characteristics of a rock mass containing a weak intercalated layer, which comprises the following steps: firstly, obtaining a stress state of a primary rock, then preparing cuboid rock samples with different combination angles in batches, and polishing a rock structural surface of the sample based on scanning data of a field rock structural surface to obtain a true triaxial sample; adjusting the water content of the weak intercalated layer obtained on site or the weak intercalated layer similar material prepared by uniformly mixing the weak intercalated layer according to the proportion to the required water content, maintaining, adjusting the rotating support to the required angle, sequentially adding the materials into a mold, and finally loading the sample to a primary rock stress state and carrying out later-stage standardization treatment. According to the method, by adjusting the splitting and grinding angle of the mother rock, setting the mold with an inclinable angle and setting different thicknesses of the weak intercalated layers, the weak intercalated layer-mother rock composite samples with different occurrence states and thicknesses are prepared, the weak intercalated layers are distributed more uniformly, and the obtained weak intercalated layer-mother rock composite true triaxial sample is easy to form and has good mechanical properties. And the method is more in line with the actual spatial topology distribution state of the weak intercalated layer on site.

Description

technical field

[0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for preparing a true triaxial sample that reflects the occurrence characteristics of rock masses containing weak interlayers. Background technique

[0002] At present, the hydropower, mine and tunnel projects under construction in our country are complex due to the complex geological structure and there are many different types of weak interlayers in the rock mass. The weak interlayer is the weak rock mass in the rock mass. Under the tectonic action, the original rock is altered due to shear dislocation, and the structure is damaged, which is easily susceptible to water softening and weathering. It is a thin banded geotechnical system with strong ductility and high risk. During the construction process, the large-scale high in-situ stress unloading and excavation disturbances make weak interlayers and rock masses containing weak interlayers prone to var...

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