Three-direction loading large-scale three-dimensional analog simulation test sampling method

Abstract

The invention discloses a three-direction loading large-scale three-dimensional analog simulation test sampling method. The method includes the steps: (1) inclining a test piece case; (2) obtaining prefabricated test piece stress measuring points to arrange the position of a pressure sensor; (3) obtaining the optimal proportion of similar materials of each stratum; (4) sequentially containing each stratum until all rock stratums are contained in the test piece case; and meanwhile, arranging the sensor and an oil sac in a test piece; and (6) enabling the test piece box to recover to the horizontal position after the similar materials are dried. By means of the method, complex distribution of coal seam stress in different top plate moving stages during underground excavation can be simulated, manufacturing large-inclination-angle ore bed test pieces is more convenient and effective, rock mass can be stored under the conditions of three-dimensional stress in the whole mining process, and underground space excavation under more operating conditions can be researched. In addition, the aboveground height of the whole system is decreased, and the system is lower in manufacturing cost and more stable.

Description

technical field [0001] The invention relates to a sample preparation method for a similar simulation test used to study the stress distribution of ore bodies and rock mass. Background technique [0002] Similar material simulation test is a laboratory research method based on similarity theory and dimensional analysis, and is widely used in water conservancy, mining, geology, railway and other departments. The biggest feature of the simulation test is that the test conditions can be controlled and changed artificially, so as to determine the law of the influence of single or multiple factors on the mine pressure. The test effect is clear and intuitive, and the test period is short and the effect is quick. It has played an important role in the research of mining science. Huge effect. Even with the rapid development of numerical simulation and computing science of rock mechanics, similar material simulation test is still an irreplaceable research method in mining science res...

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Problems solved by technology

[0004] Although the three-dimensional similar simulation test system in the prior art has deepened the progress of underground excavation engineering research to a certain extent, it has the following deficiencies: 1) The model size is small, and the geometric ratio will be very small when doing simulation tests. In practice, it is found that the geometric ratio of the model test is too small to reflect the impact of excavation; 2) The size of the model is fixed and cannot be adjusted, which will lead to sometimes the geometric ratio is too small, and sometimes it will lead to too much waste of space Material; 3) The direction of force is single, and it is difficult to achieve three-dimensional loading; 4) Most rock mass deformation monitoring uses strain gauges, and the data collection of rock mass deformation is not accurate enough; 5) The test piece box must be opened manually before excavation of the mine layer , which will cause an unloading effect, which is inconsistent with the actual working conditions; 6) The process of loading the device is basically carried by hand, which is inconvenient to operate; 7) Most of the applied stress loading systems are manual, so the stress loading process cannot maintain a uniform speed, And its accuracy cannot be guaranteed. In addition, loading forms such as cyclic loading cannot achieve

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