Experimental simulation device for determining position of karst cave excavated by slurry shield

Abstract

The invention provides an experimental simulation device for determining the position of a slurry shield excavation karst cave. A model test box is provided with a box body, the upper end cover of the box body is provided with a box cover, a bearing plate and a simulated stratum are arranged in the box body, and the lower part of the bearing plate is in contact with the top of the simulated stratum; a model karst cave is formed in the simulated stratum; a through hole is formed in the first side part of the box body; the position of the through hole is matched with that of a model karst cave; a shield propulsion device is mounted at the through hole and extends into the box body from the through hole; an air pressurizing device is mounted between the box cover and the bearing plate; the model karst cave is connected with a measuring device, and the measuring device is used for predicting the position of the karst cave in front of the shield propulsion device according to the change of the shield thrust, the torque and the propulsion distance. The position of the karst cave in front of the shield propulsion device is predicted according to the change of the shield thrust, torque and propulsion distance, so that the position of the karst cave in a slurry shield excavation area is determined, and safe construction of a shield tunneling machine in the karst area is ensured.

Description

technical field [0001] The invention relates to the technical field of mud-water shield tunnel engineering in civil engineering, in particular to an experimental simulation device for determining the position of a mud-water shield excavating a karst cave. Background technique [0002] During the construction of underground tunnels, it is inevitable to encounter karst problems. When the mud-water shield is used for construction, when encountering karst, it will lead to the loss of the front mud, which will cause the instability of the tunnel face; at the same time, the karst will cause the settlement of the shield machine and the control of the attitude of the shield is difficult, and the risk is very high. Timely detection and treatment of caves can effectively avoid such a situation. [0003] A lot of research has been done on karst detection methods, most of which are geophysical detection methods, and they are basically ground detection methods; for areas where ground de...

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Problems solved by technology

[0003] A lot of research has been done on karst detection methods, most of which are geophysical detection methods, and they are basically ground detection methods; for areas where ground detection cannot be carried out, most of the current excavation is based on experience, and there are few detection methods in caves. There are fewer model tests

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