CN103940394A - Monitoring system and method for simulating excavation device through tunnel pipe roof construction method - Google Patents
Monitoring system and method for simulating excavation device through tunnel pipe roof construction method Download PDFInfo
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- CN103940394A CN103940394A CN201410186575.7A CN201410186575A CN103940394A CN 103940394 A CN103940394 A CN 103940394A CN 201410186575 A CN201410186575 A CN 201410186575A CN 103940394 A CN103940394 A CN 103940394A
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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
The Monitoring Data that the present invention relates to Geotechnical Engineering model experiment is obtained system and method, especially relates to a kind of monitoring system and method for tunneltron canopy construction method excavation simulation device.
Background technology
In recent years, China's Urban Underground Rail Transit System is fast-developing, and shallow burial hidden digging constructing tunnel is because adaptability is compared with being widely used in the construction of sub. by force.Yet constructing tunnel inevitably will cause around stratum deformation and ground settlement, the physico-mechanical properties, underground water table that major influence factors has a stratum and engineering dewatering, edpth of tunnel and cover across than, construction method etc.Construction is the most important theories problem in Tunnel Engineering field to the research of stratum deformation around tunnel and ground settlement, and generally speaking the Forecasting Methodology of stratum deformation is mainly divided into: experimental formula method, model test method and theoretical method.
Because ground in-situ settlement curve shape is more similar to the probability curve of normal distribution, by several parameters, just can determine the shape of the probability curve of a normal distribution, therefore in Practical Project, apply very convenient, but experimental formula method thinks that by land subsidence curve the probability curve of normal distribution does not have theoretical foundation, and experimental formula method also has its limitation.
Numerical method can be considered complicated boundary condition preferably, the characteristic of the rock soil medium of Simulation of Complex, and the actual building course of dynamic similation engineering, solves more complicated tunnel structure problem.But because numerical simulation is to be based upon on the theoretical foundation of certain supposition and given parameters, for various different operating modes, determining that suitable elastoplasticity or viscoelastic Constitutive Model mechanics parameter are very difficult, sometimes be difficult to meet the actual conditions of field engineering, make analog result and measured data have certain deviation.
Physical simulation experiment is to take similarity theory as basis, on the basis of preparation analog material, by to model test piece loading, excavation, supporting, monitoring etc., the stability problem of the model investigation subterranean tunnel by reduced scale, a kind of research method of utilizing test findings to instruct on-the-spot construction.Can be with less cost prediction intend the holing rule of the actual mechanical state of prototype by indoor model test, at present, the example of realizing tunnel excavation by indoor model test is less, and especially under pipe shed support structure, the model test apparatus of tunnel excavation still belongs to blank at home.
Summary of the invention
Order of the present invention is for the problem existing in prior art, and a kind of monitoring system and method for accurately obtaining the tunneltron canopy construction method excavation simulation device in tunnel and stratum deformation parameter in tunnel excavation process is provided.
For achieving the above object, the monitoring system of tunneltron canopy construction method excavation simulation device of the present invention comprises: three-dimensional model test framework, loading equipemtn, Rock And Soil model, pipe shed support structure, displacement transducer, foil gauge, strain data acquisition system and displacement data acquisition system; In three-dimensional model test framework, there is Rock And Soil model, in Rock And Soil model upper end, there is loading equipemtn, in the geometric center of Rock And Soil model, be penetrated with and intend holing, in holing, plan is connected with a plurality of displacement transducer gauge heads with periphery, in the upper end of intending holing, there is pipe shed support structure, in pipe shed support structure, be pasted with foil gauge, foil gauge is connected with strain data acquisition system by foil gauge wire, and displacement transducer is connected with displacement data acquisition system by wire.
Described three-dimensional model chamber is comprised of base plate, 4 blocks of side plates and top board; Described system for monitoring displacement comprises some wires that are embedded in miniature displacement transducer gauge head, outside support, external data acquisition system, connection minitype side head and the data acquisition system (DAS) of model inside; Described strain gauge adhesion, on the single tube of pipe shed support structure, is equidistantly arranged according to single tube length, and is drawn with data acquisition system (DAS) and be connected by wire.
Further, described system for monitoring displacement comprises several miniature displacement transducer gauge heads, miniature displacement transducer gauge head is embedded in respectively the inner and plan of intending holing and holes around in half tunnel range of size, be embedded in the inner miniature displacement transducer gauge head of intending holing over against tunnel excavation face, the miniature displacement transducer gauge head that is embedded in the periphery of intending holing is parallel to intends holing axis, wire one end connects miniature displacement transducer gauge head, the other end connects external data acquisition system, and pilot and the plan axis of holing is parallel.
Further, on described three-dimensional model test framework backplate, have aperture, wire passes and is fixed on outside support from aperture.
Further, described pipe shed support structure is comprised of 9 single tubes, described foil gauge sticks on the single tube of pipe shed support structure with full-bridge, interval selects 1,3,5,7,9 five single tube of numbering to paste foil gauge, foil gauge is according to single tube length, equidistantly paste, and drawn by wire, Monitoring Data is transferred to data acquisition system (DAS).
A monitoring method for tunneltron canopy construction method excavation simulation device, concrete steps are as follows:
1) chamber of combination three-dimensional model, prepares analog material;
2) in three-dimensional model chamber, analog material is filled in compaction in layers, while highly reaching the lower half tunnel size in the bottom of intending holing, under the axis of intending holing and size place, half tunnel, outline both sides bury displacement transducer gauge head underground, wire drawn and be fixed on outside support, and being connected with data acquisition system (DAS); Continue to fill analog material, highly reach while intending holing middle part, on the axis of intending holing and size place, half tunnel, outline both sides bury displacement transducer gauge head underground, wire drawn and be fixed on outside support, and being connected with data acquisition system (DAS);
3) by 9 shaft-like single tubes numberings, paste foil gauge being numbered on 1,3,5,7,9 single tube, continue to fill analog material, when highly reaching pipe shed support structure height, single tube is buried underground and by wire, foil gauge is connected with data collector;
4) continue to fill analog material, while highly reaching on the top of intending holing half tunnel size, on the axis of intending holing and size place, half tunnel, outline both sides bury displacement transducer gauge head underground, wire drawn and be fixed on outside support, and being connected with data acquisition system (DAS);
5) filled, by pressurized equipment, to Rock And Soil model, applied acting force, on simulated formation, covered stress condition;
6) open model test box front plug baffle plate, along continuous straight runs excavation is intended holing, and holes in mining process, by the stressed and deformation of foil gauge and displacement transducer Real-Time Monitoring single tube and Rock And Soil model in plan.
Beneficial effect, owing to having adopted such scheme, system for monitoring displacement is comprised of the displacement transducer being embedded in model, for monitoring tunnel excavation process face extrusion deformation and the distortion of tunnel surrounding soil; Described strain gauge adhesion is on the single tube of pipe shed support structure, for obtaining stratum deformation.By the Dynamic Construction process of Tunnel Engineering under shop experiment approximate simulation pipe shed support structure, accurately obtain the strain parameter on digging process tunnel and stratum, can provide technical support for practice of construction., it is simple in structure, easy to operate, effective, has practicality widely.
Accompanying drawing explanation
Fig. 1 is the main TV structure figure of apparatus of the present invention.
Fig. 2 is the side-looking sectional structure chart of apparatus of the present invention.
Fig. 3 is that the foil gauge in pipe shed support structure of the present invention is arranged schematic diagram.
Wherein: 1, three-dimensional model test framework; 2, Rock And Soil model; 3, loading equipemtn; 4, pipe shed support structure; 5, displacement transducer; 6, foil gauge; 7, intend holing; 8, wire; 9, outside support; 10, outside receiver; 11, displacement meter wire; 12, foil gauge wire; 13, strain data acquisition system; 14, displacement data acquisition system.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
Embodiment 1: the monitoring system of this tunneltron canopy construction method excavation simulation device comprises: three-dimensional model test framework 1, loading equipemtn 3, Rock And Soil model 2, pipe shed support structure 4, displacement transducer 5, foil gauge 6, strain data acquisition system 13 and displacement data acquisition system 14; In three-dimensional model test framework 1, there is Rock And Soil model 2, in Rock And Soil model 2 upper ends, there is loading equipemtn 3, in the geometric center of Rock And Soil model 2, be penetrated with and intend holing 7, be connected with a plurality of displacement transducer gauge heads 5 with periphery intending holing in 7, in 7 upper ends of intending holing, there is pipe shed support structure 4, in pipe shed support structure 4, be pasted with foil gauge 6, foil gauge 6 is connected with strain data acquisition system 13 by foil gauge wire 12, and displacement transducer 5 is connected with displacement data acquisition system 14 by wire 8.
Described system for monitoring displacement comprises some wires 8 that are embedded in displacement transducer 5, outside receiver 10, outside support 9, external displacement data acquisition system (DAS) 14, connection bit displacement sensor 5 and the displacement data acquisition system 14 of model inside.Miniature displacement transducer gauge head 5 is embedded in respectively the 7 inner and plans of intending holing and holes around in half tunnel range of size, be embedded in the miniature displacement transducer gauge head 5 of 7 inside of intending holing over against tunnel excavation face, the displacement transducer 5 that is embedded in 7 peripheries of intending holing is parallel to intends holing 7 axis, wire 8 one end connection bit displacement sensor gauge heads 5, the other end connects outside receiver 10, and receiver 10 is connected with displacement data acquisition system 14.Authentic and valid for guaranteeing Monitoring Data, strict pilot and plan 7 axis of holing are parallel.On described three-dimensional model framework 1 backplate, have aperture, wire 8 passes and is fixed on outside support 9 from aperture.
Described pipe shed support structure 4 is comprised of 9 single tubes, to the single tube number consecutively of pipe shed support structure 4, be 1-9, described foil gauge 6 sticks on the single tube of pipe shed support structure 4 with full-bridge, interval selects 1,3,5,7,9 five single tube of numbering to paste foil gauge 6, foil gauge 6 is according to single tube length, equidistantly paste, and drawn by foil gauge wire 12, Monitoring Data is transferred to strain data acquisition system 13.
The monitoring method of tunneltron canopy construction method excavation simulation device of the present invention, concrete steps are as follows:
1) chamber of combination three-dimensional model, prepares analog material;
2) in three-dimensional model chamber, analog material is filled in compaction in layers, while highly reaching under 7 bottoms of intending holing half tunnel size, under 7 axis of intending holing and size place, half tunnel, outline both sides bury displacement transducer 5 underground, wire 8 drawn and be fixed on outside support 9, and being connected with displacement data acquisition system 14; Continue to fill analog material, highly reach while intending holing 7 middle part, on 7 axis of intending holing and size place, half tunnel, outline both sides bury displacement transducer 5 underground, wire 8 drawn and be fixed on outside support 9, and being connected with displacement data acquisition system 14;
3) by 9 shaft-like single tube numberings, paste foil gauge 6 being numbered on 1,3,5,7,9 single tube, continue to fill analog material, when highly reaching pipe shed support structure 4 height, single tube is buried underground and passed through foil gauge wire 12 foil gauge 6 is connected with strain data harvester 13;
4) continue to fill analog material, while highly reaching on the top of intending holing half tunnel size, on 7 axis of intending holing and size place, half tunnel, outline both sides bury displacement transducer 5 underground, wire 8 drawn and be fixed on outside support 9, and being connected with displacement data acquisition system 14;
5) filled, by loading equipemtn 3, to Rock And Soil model 2, applied acting force, on simulated formation, covered stress condition;
6) open model test box front plug baffle plate, along continuous straight runs excavation is intended holing 7, holes in 7 mining processes, by foil gauge 6 and displacement transducer 5 single tubes of real-time monitoring tubular canopy supporting construction 4 and the stressed and deformation of Rock And Soil model 2 in plan.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a monitoring system for tunneltron canopy construction method excavation simulation device, is characterized in that: this monitoring system comprises: three-dimensional model test framework, loading equipemtn, Rock And Soil model, pipe shed support structure, displacement transducer, foil gauge, strain data acquisition system and displacement data acquisition system; In three-dimensional model test framework, there is Rock And Soil model, in Rock And Soil model upper end, there is loading equipemtn, in the geometric center of Rock And Soil model, be penetrated with and intend holing, in holing, plan is connected with a plurality of displacement transducer gauge heads with periphery, in the upper end of intending holing, there is pipe shed support structure, in pipe shed support structure, be pasted with foil gauge, foil gauge is connected with strain data acquisition system by foil gauge wire, and displacement transducer is connected with displacement data acquisition system by wire.
2. the monitoring system of tunneltron canopy construction method excavation simulation device according to claim 1, it is characterized in that: described system for monitoring displacement comprises several miniature displacement transducer gauge heads, miniature displacement transducer gauge head is embedded in respectively the inner and plan of intending holing and holes around in half tunnel range of size, be embedded in the inner miniature displacement transducer gauge head of intending holing over against tunnel excavation face, the miniature displacement transducer gauge head that is embedded in the periphery of intending holing is parallel to intends holing axis, wire one end connects miniature displacement transducer gauge head, the other end connects outside receiver, data acquisition system (DAS), and pilot and the plan axis of holing is parallel, outside receiver is connected with data acquisition system (DAS).
3. the monitoring system of tunneltron canopy construction method excavation simulation device according to claim 2, is characterized in that: on described three-dimensional model test framework backplate, have aperture, wire passes and is fixed on outside support from aperture.
4. a kind of monitoring system of tunneltron canopy construction method excavation simulation device according to claim 1, it is characterized in that: described pipe shed support structure is comprised of 9 single tubes, described foil gauge sticks on the single tube of pipe shed support structure with full-bridge, interval selects 1,3,5,7,9 five single tube of numbering to paste foil gauge, foil gauge is according to single tube length, equidistantly paste, and drawn by wire, Monitoring Data is transferred to data acquisition system (DAS).
5. a monitoring method for tunneltron canopy construction method excavation simulation device, is characterized in that, comprises the steps:
1) chamber of combination three-dimensional model, prepares analog material;
2) in three-dimensional model chamber, analog material is filled in compaction in layers, while highly reaching the lower half tunnel size in the bottom of intending holing, under the axis of intending holing and size place, half tunnel, outline both sides bury displacement transducer gauge head underground, wire drawn and be fixed on outside support, and being connected with data acquisition system (DAS); Continue to fill analog material, highly reach while intending holing middle part, on the axis of intending holing and size place, half tunnel, outline both sides bury displacement transducer gauge head underground, wire drawn and be fixed on outside support, and being connected with data acquisition system (DAS);
3) by 9 shaft-like single tubes numberings, paste foil gauge being numbered on 1,3,5,7,9 single tube, continue to fill analog material, when highly reaching pipe shed support structure height, single tube is buried underground and by wire, foil gauge is connected with data collector;
4) continue to fill analog material, while highly reaching on the top of intending holing half tunnel size, on the axis of intending holing and size place, half tunnel, outline both sides bury displacement transducer gauge head underground, wire drawn and be fixed on outside support, and being connected with data acquisition system (DAS);
5) filled, by pressurized equipment, to Rock And Soil model, applied acting force, on simulated formation, covered stress condition;
6) open model test box front plug baffle plate, along continuous straight runs excavation is intended holing, and holes in mining process, by the stressed and deformation of displacement transducer and foil gauge Real-Time Monitoring Rock And Soil model and single tube in plan.
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| CN112924291B (en) * | 2021-02-07 | 2022-05-20 | 重庆大学 | Model test device and test method for tunnel-type anchorage under tunnel |
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| CN114518441A (en) * | 2022-01-27 | 2022-05-20 | 武汉理工大学 | Two-dimensional test model and method for simulating tunnel excavation stratum loss |
| CN114518441B (en) * | 2022-01-27 | 2024-05-24 | 武汉理工大学 | Two-dimensional test model and method for simulating tunnel excavation stratum loss |
| CN115902151A (en) * | 2022-09-26 | 2023-04-04 | 山东大学 | Test device and method for simulating shield stratum loss and monitoring soil body displacement |
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