True triaxial testing device for servo control rock

Abstract

The invention discloses a true triaxial testing device for a servo control high-stress rock. The true triaxial testing device disclosed by the invention comprises a counter-force frame, an axial pressure loading system, a confining pressure loading system and a measuring and acquisition control system, wherein hydraulic pillows are installed at the periphery of the inner surface of the rectangular counter-force frame and sheathed outside a columnar rock specimen on the scene; the columnar rock specimen has the dimension range: the length is 30-100cm, the width is 30-100cm and the height is 60-150cm; one end of a measuring rod is arranged in the side center of the columnar rock specimen, and the other end of the measuring rod passes through the counter-force frame and is connected with the measuring and acquisition control system; and the hydraulic pillows are connected with a confining pressure loading servo control system. The device disclosed by the invention provides high confining pressure by utilizing the rock large-dimension specimen on the site in an underground chamber and loading the hydraulic pillows, can bear complicated stress and can independently load servo control to obtain the comprehensive intensity of the rock.

Description

technical field [0001] The invention relates to a rock mass mechanics test equipment, in particular to a large-scale, high-stress servo-controlled rock mass true triaxial test device. Background technique [0002] Due to the gradual increase in the scale of large underground cave groups, the underground geological environment in which they are located is also becoming more and more complex. Therefore, under the conditions of deep burial and high ground stress, there are problems such as the stability, failure form and failure mechanism of the surrounding rock of the cave group. On-site rock mechanics test is the main research method to solve this kind of problems. [0003] At present, the direct shear test is mainly used to obtain the rock mass strength on site. The direct shear test needs to preset the shear plane, and the test results can only reflect the shear plane strength, but cannot reveal the comprehensive strength of the rock mass. The strength criterion is matche...

AI Technical Summary

Problems solved by technology

[0004] The rock mass sample size of the triaxial test that has been carried out so far is small, which cannot reveal the comprehensive strength of the rock mass, and is far from the actual comprehensive condition of the engineering rock mass, and the size effect is obvious

The on-site rock mass triaxial test that has been carried out is loaded by a jack to provide axial pressure and confining pressure to the sample. The sample bears a hard force, and the comprehensive strength of the rock mass is not accurate.

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