Multifunctional in-situ rock and soil body torsional shear specimen device

Abstract

The invention provides a multifunctional in-situ rock and soil body torsional shear specimen device, which comprises a support platform, a servo motor and a hydraulic jack, wherein the servo motor andthe hydraulic jack are arranged at the upper end of the support platform; a telescopic rod and a push rod are arranged at the lower end of the support platform; the upper end of the telescopic rod passes through the support platform to be connected with a transmission shaft of the servo motor; the upper end of the push rod passes through the support platform to be connected with the hydraulic jack; the lower end of the telescopic rod is fixedly provided with a gear A; the push rod is connected with a specimen sleeve through a connecting element; a gear B is connected onto the specimen sleevein a sleeving way; and the gear B is engaged with the fixed gear A. A torsional shear mechanical test instrument uses a force sensor, so that the normal pressure exerted by the hydraulic jack is controlled; the normal tension exerted by the hydraulic jack can also be controlled; through the cooperation of the servo motor and the jack, the normal pressure (tension) and lateral torsional force can be exerted onto the specimen at the same time; and the pressure (tension) torsional shear mechanical experiments of the field specimen can be performed, so that the mechanical performance study on thefield specimen becomes possible.

Description

technical field [0001] The invention belongs to the field of rock and soil engineering mechanics test instruments, and relates to a multifunctional in-situ rock and soil body torsional shear sample device. Background technique [0002] The shear strength parameters of rock and soil are the basic parameters for deformation stability analysis of geotechnical engineering, and the usual methods of obtaining them are laboratory tests and field tests. Among them, the direct shear test is generally carried out in the field test, and the normal stress is considered to be the compressive stress, that is, the compressive shear test is carried out. However, many rocks and soils in engineering not only have the stress state of compressive shear, but also the stress state of tensile shear in many cases, such as the position of slope shoulder. Previous studies have shown that the mechanical properties of rock and soil are significantly different under the tension-shear stress state and t...

AI Technical Summary

Problems solved by technology

However, due to the complex field environment, it is difficult for large-scale indoor torsional shear instruments and equipment to meet the site requirements, and it is difficult to realize the torsional shear mechanics test of rock mass in the field, and the in-situ performance of rock and soil samples cannot be guaranteed during the test

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