| CPC E02D 33/00 (2013.01) [E21F 17/00 (2013.01); G01M 7/08 (2013.01); G01M 17/0078 (2013.01); G01N 3/30 (2013.01); G01N 3/303 (2013.01); G01N 3/307 (2013.01)] | 8 Claims |
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1. A test method for simulating critical rock collapse of surrounding rock in underground engineering utilizing a system for simulating the critical rock collapse of the surrounding rock in underground engineering, wherein
the system comprises:
a platform for simulating the critical rock collapse of the surrounding rock in underground engineering, the platform comprising:
four reaction walls, being arranged vertically, wherein the four reaction walls define a square reaction space, and a base is mounted at a lower end opening of the four reaction walls;
a row of horizontally arranged stress loading plates disposed at a side of each of the four reaction walls facing the reaction space; and
a reaction beam disposed above the reaction space, wherein
the reaction beam, the stress loading plates, and the base define a loading space, the loading space being configured for placement of a surrounding rock simulation block to be tested,
the stress loading plates are configured to move horizontally in a normal direction of the four reaction walls, and the reaction beam is configured to move in a vertical direction, so as to load the surrounding rock simulation block, and
the stress loading plates and the reaction beam are respectively driven by linear motion units for movement; and
a simulation system comprising:
a holographic projection device;
a control device; and
the surrounding rock simulation block, wherein
a sensor is mounted in the surrounding rock simulation block, the sensor being configured to transmit information of the surrounding rock simulation block when being loaded to the control device,
a three-dimensional model of the surrounding rock simulation block is pre-stored in the control device,
the control device is configured to change the three-dimensional model according to the information from the sensor, and
the holographic projection device is configured to complete projection of the three-dimensional model in space according to the information transmitted by the control device, the test method comprising:
starting the control device to control the stress loading plates to synchronously advance and arches to synchronously rise to form a semi-enclosed space together with the base;
prefabricating the surrounding rock simulation block in the semi-enclosed space, burying the sensor in rock mass, connecting the sensor and the control device to start to obtain internal displacement and stress state information of the rock mass, performing routine maintenance after the prefabrication is completed, and waiting for a material strength to meet design requirements;
mounting a monitoring device at a set position, and starting the holographic projection device to project an initial state of a rock mass structure of the surrounding rock simulation block;
controlling the stress loading plates to apply a stress load to the surrounding rock simulation block by layers with a stable applied pressure, waiting for multi-physics field information of the surrounding rock simulation block to stabilize again, and then starting a next step;
drilling a hole above an arch contour line of the surrounding rock simulation block, burying a blasting simulation device in the surrounding rock simulation block and connecting the blasting simulation device to the control device, simulating a single blasting vibration, and meanwhile successively sinking a lifting arch to a basement in a simulated excavation direction;
before and after the sinking of the lifting arch each time, monitoring a multi-physics field state change process of the rock mass structure, and after a multi-physics field state is stable, raising the sunk lifting arch to a set distance below a rock surface to prevent casualties and instrument damage caused by rock collapse; and
starting a next cycle of excavation simulation and monitoring until all excavation is completed.
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