Preparation method of experimental model of in-situ columnar joint rock

Abstract

The invention discloses a preparation method of an experimental model of in-situ columnar joint rock. The method comprises the following steps: selecting a to-be-studied columnar joint rock mass area in an engineering field, and cutting in a direction perpendicular to the axial direction of column bodies to obtain column body sections in the area; obtaining sketches of a plurality of irregularly polygonal joints in the corresponding area; scaling the sketches according to the similarity ratio of (10:1)-(25:1) to generate corresponding moulds, generating column body models by adopting a material which has physical-mechanical properties similar to those of the prototypes, and gluing the column body models to form a cubic model; and curing the cubic model, then cutting and polishing the cubic model to obtain a sample with a standard size, and finally performing a physical-mechanical experiment on a joint rock mass on an indoor experimental instrument. According to the preparation method of the experimental model, the similar model is prepared for indoor experiments under the actual conditions of the field and on the premise of following a similarity principle, the difficulty of an in-situ experiment is solved, the authenticity is kept, an experiment result can be provided as a basis for engineering calculation and study, a high practical value and good economic benefits are achieved, an extra experimental instrument design is not needed, and the experimental cost is low.

Description

technical field [0001] The invention relates to the field of rock mechanics, in particular to an in-situ columnar joint rock. Background technique [0002] Columnar jointed rock mass is a kind of primary jointed rock mass with special rock mass structure and mechanical properties. It is widely distributed in hydropower development areas in Southwest China, such as large hydropower stations: Jin'anqiao, Baihetan, Xiluodu, etc. It is one of the hotspots in the field of rock mechanics research. [0003] In order to study the widely occurring columnar jointed rock mass in the engineering site, it is necessary to carry out relevant mechanical tests. The test methods of rock mechanics can be divided into on-site in-situ test and indoor test. The large-scale field test is complicated, expensive, and inevitably affected by site conditions and size effects, and the results need further analysis. [0004] The failure form of columnar joint rock mass is mostly the structural failure ...

AI Technical Summary

Problems solved by technology

The test methods of rock mechanics can be divided into on-site in-situ test and indoor test. The large-scale field test is complicated, expensive, and inevitably affected by site conditions and size effects. The results need further analysis.

[0004] The failure form of columnar joint rock mass is mostly the structural failure of the joint surface. At present, the laboratory test research is rarely seen in the literature, and the joint structure in the laboratory test of prefabricated joint materials is relatively regular and simple, which is quite different from the natural columnar joint rock mass. The experimental results obtained cannot truly reflect the natural columnar jointed rock mass

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