The invention relates to a muddy water balance type shield simulation testing system. In the structure of the system, a model box for holding soil is fixed on a base; a refrigeration freezing device is communicated with a freezing pipe in the model box; the front part of a shield machine enters the model box through a guide sleeve on the side of the model box; a cutter disk at the front part of the shield machine is connected with the output shaft of a gearbox of a hydraulic power system through a main shaft; jacks at the left and right sides of the shield machine are connected between the model box and the gearbox; a space between a partition plate behind the cutter disk of the shield machine and the cutter disk forms a muddy water cabin; and an injection pipe of a muddy water pot, whichis connected with an air pressure boosting device, penetrates into the shield machine from the tail part of the shell of the shield machine. The system provided by the invention can simulate the tunneling process of the muddy water shield machine in a submerged tunnel construction with high water pressure and can synchronously record soil pressure, water pressure, displacement and the tunneling parameters of the shield machine, thereby finding out and analyzing the mechanism and conditions of muddy water pressure balance country rock and providing more reliable experiment basis for submerged tunnel construction and the design of a muddy water shield machine.

Muddy water balance type shield simulation testing system

Parallel pipe jacking construction simulation device

The invention relates to a simulation test device applied in the field of urban subway engineering, in particular to a simulation test system for a soil pressure balance shielding screw conveyer The simulation test system comprises a screw conveyer consisting of a sleeve, screw arranged in the sleeve and a motor for driving the screw, wherein the end part of the screw passes through a soil box The simulation test system is characterized in that the end part of the screw is arranged in the center of the bottom of the soil box; and the top of the soil box is connected with a water box through a stabilized pressure pump The simulation test system has the advantages that the stabilized pressure pump takes water as a medium to provide stable water pressure for soil layers and dregs in the soil box, so that the simulation test system can simulate the soil and water pressure supported by the bottom of the screw conveyer when a shield is positioned in water-rich strata of different types or passes through rivers for tunneling

Simulation test system for soil pressure balance shielding screw conveyer

The invention relates to a multifunctional slurry shield test system for teaching. The system comprises a model box (1), a shield tunneling machine, a slurry feeding component, a slurry discharge component, a slurry box (35), a collection box (33), a sampling box (38) and a hydraulic power unit, wherein the side surface of the model box (1) is provided with an opening which communicates with the front part of the shield tunneling machine; the shield tunneling machine also communicates with the slurry box (35) and the collection box (33) through the slurry feeding component and the slurry discharge component respectively; a communication pipe (42) is arranged between the slurry box (35) and the collection box (33); the shield tunneling machine forms a slurry circulating system together with the slurry feeding component, the slurry discharge component, the slurry box (35) and the collection box (33). Compared with the prior art, the multifunctional slurry shield test system for teaching is simple in structure, adopts organic glass as material, can show a slurry shield test process in all aspects, has the function of simulating an excavation face stability test of the slurry shield tunneling machine in a non-tunneling state, and also has the function of simulating tunneling of the slurry shield tunneling machine.

Multifunctional slurry shield test system for teaching

The invention discloses a formation simulation hydraulic multi-mode loading system for testing a shield propulsion system. The loading system comprises a hydraulic propulsion system consisting of a propulsion hydraulic cylinder, a speed load module in a pressure regulating propulsion mode, a pressure load module in a speed regulating propulsion mode and a proportional throttle valve load module in the pressure regulating propulsion mode and the speed regulating propulsion mode, wherein one oil port of the hydraulic propulsion system is connected with a rodless cavity of the propulsion hydraulic cylinder, and the other oil port of the hydraulic propulsion system is connected with a rod cavity of the propulsion hydraulic cylinder; the three modules are connected with a rodless cavity of a loading hydraulic cylinder; a rod cavity of the loading hydraulic cylinder is connected with an oil tank; and the tops of the loading hydraulic cylinder and the propulsion hydraulic cylinder are connected to realize loading. Load regulation is realized by a valve control technology, so that the loading system has a high frequency response characteristic; by a cartridge valve technology, the system is suitable for the high-flow working condition and is reliably sealed; and by adding or reducing hydraulic loading units with different functions, multi-mode loading is convenient to realize.

Formation simulation hydraulic multi-mode loading system for testing shield propulsion system

The present invention relates to a large shield driving simulation test platform. Its simulation shield driving machine adopts phi 1800 mm. Said shield driving simulation test platform also includes the components of drawbar, soil box, rear back, main top device, several bags set in the soil box, soil pressure sensors and pore pressure sensors which are set in the soil box and connected with monitoring system, hydraulic system, control system and sealing device, etc.

Li Xianghong

Papers

Large shield tunnelling analogue test platform