Sectional loading and unloading test device in rock hole

Abstract

The invention discloses a test device for segmented loading and unloading in rock pores. The test device comprises an in-pore hydraulic loading and unloading device group, an end surface cover plate, a filling button, a hydraulic pipeline, an electro-hydraulic servo loading and unloading system and a control host, wherein the in-pore hydraulic loading and unloading device group is formed by sequentially arranging multiple in-pore hydraulic loading and unloading devices from top to bottom; each in-pore hydraulic loading and unloading device comprises a hydraulic bag, a bag lining, a bag support, a bag bolt pipe and a tightening nut; the end surface cover plate is used for transmitting axial compression, a step-shaped pipe groove is formed in the center of the end surface cover plate, and space between the pipe groove and the end surface of a rack sample is filled with the filling button. The test device is compact in structure, independent and synergetic functions are realized, complicated high-stress fields can be formed in the rock sample by regulating different loading combinations of confining pressure, axial compression and segmented internal pressure, and parameters such as a segmented unloading time interval, a segmented unloading sequence, an in-segment unloading stress path and the like can be changed through the control host, so that characteristics of segmented unloading response in the rock pores under the complicated high-stress fields are studied.

Description

technical field [0001] The invention relates to an indoor rock mechanics test device, in particular to a segmental loading and unloading test device in a rock hole which can realize multi-stage and step-by-step loading and unloading in a high-stress rock hole. Background technique [0002] With economic development, the contradiction between the demand for mineral resources and the resource reserves in shallow strata has become increasingly prominent. In order to achieve sustainable development of the national economy, the basic industry of mining will shift to deep strata, and deep mining will be the key to mining. The inevitable trend and the status quo that will be faced in the long-term in the future. In the practice of deep mining, there have been some disaster phenomena that cannot be reasonably explained by existing theories and seriously affect the construction of deep engineering and the efficient recovery of resources, such as large extrusion deformation, rockburst...

AI Technical Summary

Problems solved by technology

The conventional rock triaxial testing machine can load and unload independent multi-stress paths of the wall confining pressure and the end axial pressure of cylindrical rock samples, while the rock true triaxial testing machine can realize different stress paths of the end pressure in three directions of the square rock samples Loading and unloading can be used to physically simulate the mechanical process of local rock blocks in the surrounding rock of the excavation project, but the current rock material testing machine cannot realize the loading and unloading of segments and various stress paths in the rock hole, and cannot simulate the surrounding rock of the excavation The overall unloading response process, let alone the segmental unloading test in the rock hole under the complex stress field similar to the tunnel and underground space engineering excavation process

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