Transient unloading test simulation system for deep fractured rock mass under high confining pressure

Abstract

The invention discloses a transient unloading test simulation system for deep fractured rock mass under a high confining pressure. The system mainly comprises a rock mass model, a support frame body,a test bench, a horizontal loading device, a vertical loading device, a loading and unloading device and a monitoring device, wherein the rock mass model is arranged in the support frame body, and thesupport frame body is arranged on the test bench; the bottom and left side of the rock mass model are jointed with the inner wall surface of the support frame body, and the right side of the rock body model is connected with an output end of the horizontal loading device; the top of the rock body model is connected with the vertical loading device; the loading and unloading device passes throughthe support frame body, and is connected with the lower part of the right side face of the rock mass model; an input end of the monitoring device is connected with the rock mass model. The transient unloading test simulation system for deep fractured rock mass under the high confining pressure has the beneficial effects that the system can realize a simulation test capable of simulating the following two mechanisms: transient redistribution, caused by transient unloading of surrounding rock, of a secondary stress field during blasting excavation; local damage possibly caused by quasi-static change of secondary stress field due to surrounding rock creep; therefore, the transient adjustment of the secondary stress field is realized, and the system is more in line with actual unloading situation in a project.

Description

technical field [0001] The invention relates to the technical equipment field of rock engineering simulation test, in particular to a simulation system for local transient unloading test of high confining pressure of deep fissure rock mass. technical background [0002] Rocks in nature, after long-term tectonic movement and human disturbance, usually undergo transient unloading under different circumstances, and local transient unloading will cause changes in the surrounding rock stress. There are two mechanisms for surrounding rock stress changes: (1) transient redistribution of secondary stress field caused by transient unloading of surrounding rock during blasting and excavation; (2) quasi-static secondary stress field caused by surrounding rock creep Changes, local damage may occur, and then cause the transient adjustment of the secondary stress field. Both mechanisms may lead to changes in the stress state of the surrounding rock, and then lead to disasters. However, ...

AI Technical Summary

Problems solved by technology

Both mechanisms may lead to changes in the stress state of the surrounding rock, which may lead to disasters

However, the existing transient unloading simulation systems are rarely simulated according to the specific engineering environment in which the rock mass is located

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