Stress gradient automatic loading device and loading method

Abstract

The invention discloses an automatic stress gradient loading device. The device comprises a rigid frame, wherein four rigid loading side plates are arranged in the rigid frame, a square loading cavityis defined by the four rigid loading side plates, the rigid frame is further provided with end covers for sealing two ends of the square loading cavity, a force transmission assembly is mounted in the loading cavity in a matched mode, a cylindrical sample loading cavity is formed in the middle of the force transmission assembly, the force transmission assembly comprises an elastic cylindrical sleeve, an elastic circular truncated cone arranged outside the elastic cylindrical sleeve in a sleeving mode and a square elastic body arranged outside the elastic circular truncated cone in a sleevingmode, and the force transmission assembly further comprises a loading system arranged in the rigid frame and used for applying the force to the four rigid loading side plates. The device has the characteristics of simple structure, convenience in operation and capability of realizing gradient loading of the axial stress of the sample.

Description

technical field [0001] The invention relates to a rock mass mechanical performance testing device, in particular to a stress gradient automatic loading device and a loading method. Background technique [0002] It has become the consensus of scientists around the world that human beings must march deep into the earth. The current factors restricting deep rock mass engineering are mainly "three highs and one disturbance", that is, high ground stress, high ground temperature, high osmotic pressure, and strong mining disturbance. The stability study of rock mass is the premise of deep engineering. For this reason, scholars at home and abroad have extensively explored the mechanical response of rock under high ground stress, high ground temperature, high seepage pressure and mining disturbance. In the current research process of rock response to different influencing factors under high stress, the applied stress is usually constant. However, whether it is mining roadway, chamber...

AI Technical Summary

Problems solved by technology

Existing research fails to reflect the real stress conditions of rocks, which leads to the disconnection between laboratory research and field application of rock mechanics, and restricts the development of rock engineering

At present, the influence of other factors on rock mechanical properties and stability under stress gradient is limited to numerical calculation. The reason is that a set of key equipment for applying stress gradient in rock static and dynamic mechanical experiments has not been developed.

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