Combined type loess stratum shield tunnel construction full-stage test device capable of uniformly humidifying

Abstract

A combined type loess stratum shield tunnel construction full-stage test device capable of uniform humidifying comprises a detachable model box, a shield model, a uniform humidifying device, a grouting device, a power device and a monitoring device, wherein the detachable model box is divided into a starting bin, a tunneling bin and a receiving bin, a simulated stratum, the shield model and a water permeable plate are arranged in the tunneling bin, and the uniform humidifying device performs uniform humidifying through the water permeable plate; the shield model can simulate the whole construction process of excavation, shield tail void, wall back grouting and the like; and the power device provides propelling power for the shield model, the grouting device conducts grouting through grouting holes in pipe pieces in the excavation process, meanwhile, soaking is conducted by the uniform humidifying device, and the monitoring device is used for monitoring changes of surrounding rock displacement and ground surface settlement in the whole stage of loess stratum shield construction in the humidifying process. According to the combined type loess stratum shield tunnel construction full-stage test device, the uniform humidifying process and the whole construction process of the loess stratum shield tunnel construction are realized, and the stratum deformation is monitored.

Description

technical field [0001] The invention belongs to the technical field of shield construction simulation test devices or equipment, and in particular relates to a combined all-stage test device for shield tunnel construction in loess strata that can uniformly humidify. Background technique [0002] The shield construction method is widely used in the construction of urban subway tunnels due to its advantages of high degree of mechanization and strong stratum applicability. For the loess strata, because of the large change in the strength index after water soaking and humidification, the evolution law of the surrounding rock pressure after the stratum is humidified is different from other construction processes such as excavation of the shield tunnel in the loess stratum - emptying of the shield tail - grouting behind the wall. Strata. [0003] At present, there is no model test device that can realize the whole-stage construction of shield tunneling and consider the influence ...

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