Laboratory model test device for testing influence on operating tunnel from vertically-overlapped tunnel construction
An indoor model and test device technology, applied in teaching models, educational appliances, instruments, etc., can solve the problems of erroneous monitoring information, large amount of calculation, difficult to obtain soil physical and mechanical parameters, etc., and achieves good extensiveness and strong scalability. Effect
Active Publication Date: 2014-08-20
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology
Numerical simulation method can simulate shield tunnel segments, joints, surrounding rock-soil media, and the interaction between adjacent structures and soil, but large-scale commercial software is needed, and the establishment of numerical models is complicated and time-consuming
In addition, due to the limitations of geotechnical testing equipment, it is difficult to obtain accurate soil physical and mechanical parameters, and changes in soil parameters have a great impact on numerical simulation results, so it is easy to cause deviations in calculation results
The theoretical analysis method uses the theory of elasticity and simplifies the research model through assumptions, but to a certain extent, it cannot accurately consider the complex relationship between the tunnel and the soil, and the amount of calculation is large; the on-site monitoring method is to obtain There is one way to operate tunnel deformation data, but due to the limitations of equipment and human observation factors, the on-site test results have certain deviations. At the same time, on-site monitoring requires a certain amount of manpower and material resources. The pre-embedded test components on site are very easy to be damaged during construction. damage, thereby delaying monitoring and even obtaining wrong monitoring information
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Embodiment Construction
[0022] The present invention will be further described in detail through a preferred example below in conjunction with the accompanying drawings.
[0023] First, make a model box, two existing tunnel lining models, two excavated tunnel lining models and two excavation construction simulation devices.
[0024] Such as figure 1 , 2 As shown, the shape of the model box 1 is a cuboid, and the internal space size is 1200 mm × 1200 mm × 800 mm (length × width × height), which is composed of five aluminum alloy plates with a thickness of 30 mm. The existing lining models 2 and 3 for the upper and lower lines of the tunnel are respectively composed of hollow aluminum alloy tubes 4 with an outer diameter of 100 mm, an inner diameter of 84 mm, a wall thickness of 8 mm, and a longitudinal length of 800 mm. The upper and lower line lining models 5 and 6 of the excavated tunnel are six-section hollow aluminum alloy tubes 7 with an outer diameter of 100 mm, an inner diameter of 84 mm, a w...
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The invention relates to a laboratory model test device for testing the influence on an operating tunnel from vertically-overlapped tunnel construction. An uplink lining model and a downlink lining model of an existing tunnel are longitudinally and symmetrically placed in parallel inside a model box. An uplink lining model and a downlink lining model of an excavated tunnel are transversely and symmetrically placed in parallel above and below the uplink lining model and the downlink lining model of the existing tunnel. Strain meters adhere to the inner walls of the uplink lining model and the downlink lining model of the existing tunnel and pressure cells adhere to the outer walls of the uplink lining model and the downlink lining model of the existing tunnel. The uplink lining model and the downlink lining model of the excavated tunnel are divided into multiple lining sections. The lining sections are separated through thin rubber boards. Displacement meter supports are fixed to the top face of the model box and multiple displacement meters are fixed to the uplink lining model and the downlink lining model of the existing tunnel, the uplink lining model and the downlink lining model of the excavated tunnel and the stratum soil mass surface through the corresponding displacement meter supports respectively. An excavation construction simulation device comprises a latex film surrounding the lining models of the excavated tunnel and an annular liquid cavity formed between the lining models of the excavated tunnel and the latex film. One end of the annular liquid cavity is provided with a liquid injection guide pipe and the other end of the annular liquid cavity is provided with a liquid drainage guide pipe.
Description
technical field [0001] The invention relates to a tunnel project in an urban underground construction project, in particular to an indoor model test device for the influence of upper and lower overlapping shield tunnel construction on existing operating tunnels. Background technique [0002] As my country's urbanization process continues to intensify, the contradiction between urban development and the shortage of land resources has become increasingly prominent, and the development and utilization of urban underground space resources has become one of the important directions for sustainable social development. Shield tunneling in urban soft soil areas has been widely used in underground engineering construction due to its advantages such as less impact on the surrounding environment, adaptability to soft geological conditions, and faster construction speed. However, in actual construction, due to the constraints of many factors such as surface buildings, underground pile f...
Claims
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IPC IPC(8): G09B25/00
Inventor 张治国王卫东白乔木
Owner UNIV OF SHANGHAI FOR SCI & TECH
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