Monitoring system and method for simulating excavation device through tunnel pipe roof construction method

Abstract

The invention provides a monitoring system and method for simulating an excavation device through a tunnel pipe roof construction method and belongs to data collection methods of geotechnical engineering model tests. The monitoring system comprises a three-dimensional test frame, a loading device, a geotechnical body model, a pipe roof supporting structure, a displacement sensor, a strain gauge, a strain data collection system and a displacement data collection system; the geotechnical body model is arranged in the three-dimensional test frame; the upper end of the geotechnical body model is provided with the loading device; a simulation excavation tunnel penetrates the geometrical center of the geotechnical body model; a plurality of displacement sensor measuring heads are connected with the inside and the periphery of the simulation excavation tunnel; the upper end of the simulation excavation tunnel is provided with the pipe roof supporting structure; the strain gauge is pasted on the pipe roof supporting structure; the strain gauge is connected with the strain data collection system through a strain gauge lead; the displacement sensor is connected with the displacement data collection system through a lead. According to the monitoring system and method for simulating the excavation device through the tunnel pipe roof construction method, the dynamic construction process of tunnel engineering under the pipe roof supporting structure is approximately simulated through an indoor test and accordingly strain parameters of the tunnel and a stratum in the excavation process can be accurately obtained and support can be provided for actual construction.

Description

technical field [0001] The invention relates to a monitoring data acquisition system and method for geotechnical engineering model experiments, in particular to a monitoring system and method for simulating an excavation device in a tunnel pipe shed construction method. Background technique [0002] In recent years, my country's urban underground rail transit system has developed rapidly, and shallow buried tunnel construction has been widely used in the construction of underground railways due to its strong adaptability. However, tunnel construction will inevitably cause deformation of the surrounding strata and surface settlement. The main influencing factors are the physical and mechanical properties of the strata, groundwater level and project precipitation, tunnel depth, cover-span ratio, and construction methods. The research on the formation deformation and surface settlement around the tunnel is an important theoretical issue in the field of tunnel engineering. Gener...

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Problems solved by technology

Indoor model tests can be used to predict the law of the actual mechanical state of the proposed tunnel prototype at a relatively low cost. At present, there are few examples of tunnel excavation through indoor model tests, especially the model of tunnel excavation under the pipe shed support structure The test device is still blank in China

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