Three-dimensional loading large-scale three-dimensional similar simulation test load simulation method

Abstract

The invention discloses a load simulation method for a triaxially loading large-scale three dimensional similitude simulation test. The load simulation method comprises the following steps of (1) loading X-direction horizontal loading pressure, Y-direction horizontal loading pressure and Z-direction vertical loading pressure by a force-control mode; (2) maintaining the load; and (3) when the Z-direction vertical loading pressure is larger than or equal to 5 kN, and the instantaneous decreasing force of the Z-direction vertical loading pressure is larger than or equal to 0.3 kN, the triaxially loading is switched to a displacement-control mode. The load simulation method can simulate complex distribution phenomenon of a coal seam layer at different roof active stages in a mining process, is more convenient and has better effects for manufacturing seam test specimens with large inclined angle, can make sure that a rock mass is in the triaxial stresses in the whole mining process, can be used for studying underground space excavation under more working conditions, reduces the height on the earth's surface of the whole system, and has lower cost and more stable system.

Description

technical field [0001] The invention relates to a load simulation method for similar simulation tests used to study 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 research. I...

AI Technical Summary

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 cause 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 after the mine excavation , 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

Images