Settlement simulation test platform and method for shield tunnel overlying soil mass
A simulation test, shield tunneling technology, applied in tunnels, earthwork drilling, soil material testing, etc., can solve the problems of ineffective implementation, difficult similar simulation, complex structure, etc., to achieve good settlement monitoring, convenient production, high efficiency The effect of covering pressure evenly
Pending Publication Date: 2019-02-15
CHINA UNIV OF MINING & TECH (BEIJING) +1
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Problems solved by technology
At present, although there are related monitoring methods for surface subsidence, most of them have complex structures, and on-site monitoring is usually unable to be effectively implemented due to various restrictions on construction conditions. The similar simulation in the shield tunnel is difficult. It is very important to design an indoor 1:1 similar simulation experiment platform to study the settlement law of the overlying soil and simulate the influence of grouting on the surface settlement control.
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[0037] In the present invention, see attached figure 2 , as a preferred embodiment, the lower excavation grouting air layer 5 thickness h2, the specific structure can be a sealed air bag with a circular arc in cross section, its shape is consistent with the arc-shaped bottom plate 1, and its upper surface is consistent with the soil The lower surface of the body filling layer is attached, and the lower surface is attached to the upper surface of the arc-shaped bottom plate.
[0038] It should be noted that the thickness h1 of the upper gas constant pressure layer 9 and the thickness h2 of the lower excavated grouting gas layer 5 can be flexibly designed according to the actual situation on site, such as fully considering the pressure of the overlying soil, the maximum bearing pressure of the sealed inflatable bag And other factors, design the appropriate thickness.
[0039]Soil loss caused by excavation and soil compensation by grouting are important considerations in the st...
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The invention provides a settlement simulation test platform for shield tunnel overlying soil mass. The whole round shield tunnel is simulated by freely selecting a section of arc length on cross section of to-be-simulated actual tunnel, the soil mass above an arch mass in an actual excavation process is simulated by arranging soil layers with different thicknesses and different properties at theupper part of an arc tunnel, excavation and grouting at the upper part of a bottom plate are realized, and shield excavation is simulated by controlling grouting pressure and pressure relief conditionin an excavated grouting layer. Overlying pressure is uniform, overlying pressure of simulation soil layers is unchanged in a shield excavation process, and simulation is more real and close to actual shield excavation. The test platform is convenient to produce and can be dismounted and recycled, soil mass layered settlement rules are further explored, settlement is monitored better, and shieldtunnel construction is guided better.
Description
technical field [0001] The invention relates to the field of shield tunnel settlement tests, in particular to a simulation test platform and a test method for the settlement of overlying soil of a shield tunnel. Background technique [0002] With the construction of urban subways, shield tunneling technology has been vigorously developed. The construction technology of shield method is the key technology of subway construction project. With the continuous construction of rail transit, shield construction has occupied a place in urban rail transit construction because of its fast and safe construction. However, surface settlement has become a problem that cannot be ignored, especially in the construction of subway tunnels, the control of soil settlement is particularly important. At present, although there are related monitoring methods for surface subsidence, most of them have complex structures. On-site monitoring is usually unable to be effectively implemented due to vari...
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IPC IPC(8): G01N33/24E21D9/06
CPCE21D9/06G01N33/24
Inventor 江华江玉生李宏亮周刘刚武福美
Owner CHINA UNIV OF MINING & TECH (BEIJING)