Hypergravity two-dimensional rock mass model experiment device and method

Abstract

The invention discloses a hypergravity two-dimensional rock mass model experiment device and a hypergravity two-dimensional rock mass model experiment method. The device comprises a control center, aground oil source, a centrifugal machine, a rock loading box, an image observation device and a counterweight block; the rock loading box comprises a reaction box frame, a sheet rock sample, a confining pressure oil bag, a rigid shaft pressing head and a shaft pressing oil bag; the method utilizes N times of hypergravity environment to carry out a 1 / N time of rock mass scale model experiment, thereby greatly improving the similarity of the model experiment; the rock mass model is in a thin sheet shape, and the side plates are transparent, so that deformation, cracking and the like on the sidesurface of the sample can be directly observed in an image; compared with a single-point measurement mode of a prior strain gauge and displacement sensor, the monitoring density is greatly improved, the cost is greatly reduced, and the overall planning difficulty is greatly reduced; an integrated hydraulic oil bag is adopted to provide high pressure, a rock sample does not need to be sealed by a rubber sleeve, and the observation is convenient; and the requirement on the sealing performance of the device is greatly reduced.

Description

technical field [0001] The invention belongs to the field of rock mechanics experiments, in particular to a high-gravity two-dimensional rock mass model experiment device and method. Background technique [0002] For the mechanical properties of underground large-scale rock mass, due to the difficulty of in-situ observation, laboratory experiments are often used to explore the laws of rock mass deformation and crack propagation. However, due to the existence of self-gravity stress, there is a large stress gradient in large-scale rock mass, and the conventional scaled-scale rock mass model experiment in the laboratory cannot achieve this uniform stress gradient. The laws of crack propagation, deformation and displacement of actual engineering-scale rock mass are significantly affected by stress gradients, and it is difficult to characterize them through conventional unit rock mechanics experiments. [0003] With the emergence of ultra-gravity centrifuges, a new loading metho...

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Problems solved by technology

Based on this principle, the geotechnical experiment of the supergravity centrifuge has gradually been widely used (currently related experiments include earth-rock dam piping, dam failure experiment, offshore structure stability experiment, slope instability experiment, etc.), and for rocks, there are also Regarding the loading experiments on bridge span structures and high rock slopes, for the mechanical properties of large-scale underground rock mass, self-weight stress alone is not enough, and the problems of axial and confining pressure loading also need to be solved. At present, such related Model experiment research is still blank

In addition, during the experiment, it is necessary to monitor the strain, displacement, cracking, etc. of the rock. At present, strain gauges, various linear displacement gauges, and acoustic emission technology are often used in the triaxial chamber, but the strain gauges and displacement gauges are single-point measurement, it is difficult to provide a large amount of data required for model experiments, and acoustic emission technology is demanding and costly, and the accuracy of crack identification is limited

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