Abstract: A multifunctional and visual rock triaxial testing system is provided. The multifunctional and visual rock triaxial testing system includes an axial loading system, a high-energy accelerator computerized tomography (CT) scanning system, a turntable system, a triaxial pressure cell, a fluid fracturing pump, a temperature pump, a confining pressure loading pump, a power oil source, and an integrated control console, where the turntable system is configured to drive the high-energy accelerator CT scanning system to rotate, so as to scan an internal structure of a rock sample; and the triaxial pressure cell and the fluid fracturing pump are configured to conduct compression and fracturing tests on the rock sample, respectively.

Abstract: A rock true-triaxial testing system based on computerized tomography (CT) scanning aims to solve problems in the prior art, that is, the rigidity of the frame in the testing system is insufficient; high-pressure lines, wires, and signal lines are entangled when rotating; and the reaction frame and loading actuators obstruct the ray. The rock true-triaxial testing system includes a true-triaxial loading system and a high-energy accelerator-based CT scanning system, where the high-energy accelerator-based CT scanning system is located inside the true-triaxial loading system, and the high-energy accelerator-based CT scanning system is configured to image an internal structure of a cubic rock sample and continuously apply a stress to the cubic rock sample through a plurality of piston extension rods in the true-triaxial loading system. The rock true-triaxial testing system reduces radiation attenuation, and ensures imaging quality and a stable and smooth loading process.

Abstract: A multi-stage perforation and shock wave combined device and method for initial fracture enhancement are provided. The multi-stage perforation and shock wave combined device for initial fracture enhancement includes a perforating gun and a shock wave excitation nipple, where the perforating gun is configured to fire perforating bullets into a formation to form initial fractures; the shock wave excitation nipple is connected to the perforating gun, and includes an energetic rod capable of exploding after excitation and a feeding assembly; the feeding assembly includes a pushing head, a reciprocating spring, and a feeding spring; and the reciprocating spring is configured to push the pushing head, so as to push a spare energetic rod into a target position.

Abstract: A visualization system for simulating excavation of a fluid-structure interaction tunnel includes a fluid-structure interaction tunnel model system, a tunnel model solution supply system, a detection system and an excavation system. The tunnel model solution supply system is configured to inject a nuclide solution to simulate a fluid pressure. The detection system is configured to detect a 3D deformation state of a tunnel surrounding rock and a 3D migration process of the nuclide solution. The excavation system is provided between the detection system and the tunnel model system to simulate tunnel excavation. During the tunnel excavation, a lifting device in the excavation system controls a drilling device to ascend to a set height for operation. During 3D detection, the lifting device controls the drilling device to descend to an initial height to avoid affecting the detection of a detection device.

Abstract: A visual test system for a secondary generation or decomposition of a hydrate includes a hydrate conveying device, a computerized tomography (CT) imaging device, a temperature control device, a pressure control device and a flow control device. The hydrate conveying device includes an annular pipeline structure composed of a plurality of straight pipeline sections and a plurality of curved pipeline sections. The straight pipeline section is able to rotate around an axis thereof under the drive of a pipeline driving device. The CT imaging device is used to perform a three-dimensional (3D) detection inside the pipeline, and includes a turntable, a ray source and a detector. The ray source is able to rotate under the drive of the turntable driving device. The temperature control device, the pressure control device and the flow control device are used to control a gas-liquid mixture's temperature, pressure and flow rate, respectively.

Abstract: A triaxial rock mechanics test system for high-strain-rate cyclic dynamic loading is provided, including: a host loading module, a dynamic cyclic loading module, and a dynamic measurement module. The host loading module includes a loading frame, a triaxial pressure mechanism and an actuator that are provided inside the loading frame. The dynamic cyclic loading module includes a driving mechanism, a fixed mechanism and a mobile mechanism. The dynamic measurement module is configured to acquire axial pressure data, radial deformation data and axial deformation data of the rock sample during a test. In the triaxial rock mechanics test system for high-strain-rate cyclic dynamic loading of the present invention, an energetic rod is driven by an electrical explosion of a metal wire to generate a strong shock wave with controllable peak pressure, duration and waveform.

Abstract: A visible test system includes a test chamber system, a heating system, a pressure control system, and a high-energy accelerator CT detection system configured to scan and detect the seepage and migration of magnetic fluid in fractures in a sample. The test chamber system includes a pressure chamber and a sample encapsulation device immersed in hydraulic oil arranged inside the pressure chamber. The heating system includes a magnetic fluid heating device, a resistance wire heating device and a temperature detection device. The magnetic fluid heating device includes a magnetic fluid loading pump configured to supply the magnetic fluid injected into the sample encapsulation device and an alternating magnetic field control device configured to provide an alternating magnetic field for heating the magnetic fluid. The resistance wire heating device is configured to heat the hydraulic oil. The present invention makes the fracture connectivity change during rock mass fracture visible.