CN105780828A - Model test device for influences of open cut foundation pit on nearby building foundation and operation method - Google Patents
Model test device for influences of open cut foundation pit on nearby building foundation and operation method Download PDFInfo
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- CN105780828A CN105780828A CN201610276119.0A CN201610276119A CN105780828A CN 105780828 A CN105780828 A CN 105780828A CN 201610276119 A CN201610276119 A CN 201610276119A CN 105780828 A CN105780828 A CN 105780828A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
The invention discloses a model test device for influences of an open cut foundation pit on a nearby building foundation and an operation method, and relates to the technical field of foundation construction. The model test device comprises a working condition simulation frame, building simulation systems and a comprehensive monitoring and analyzing system. The working condition simulation frame comprises a structure frame and a test bed base. The two building simulation systems are independently arranged on the test bed base. Each building simulation system comprises a simulation rock and earth mass, a water trough, a lifting water tank, a precast pile foundation and a load, wherein the lifting water tank communicates with the water trough, the water trough communicates with the simulation rock and earth mass, the precast pile foundation extends into the simulation rock and earth mass, and the load is arranged on the precast pile foundation. The comprehensive monitoring and analyzing system comprises displacement induction heads pre-embedded in the simulation rock and earth masses and a comprehensive monitoring and analyzing terminal connected with the displacement induction heads. By means of the model test device and the operation method, contrastive analysis can be conducted on multiple sets of different parameters in real time, the test efficiency is greatly improved, the test result has higher general representativeness, and beneficial reference is provided for scientific research and technologies of foundation pit excavation.
Description
Technical field
The present invention relates to foundation construction technical field, model test apparatus that specifically adjacent building basis is affected by a kind of open-cut foundation ditch and operational approach.
Background technology
The current situation of traffic day by day blocked up along with large-and-medium size cities increases the weight of gradually, and building of subway becomes drive urban economy development, alleviates traffic pressure, pulls the important transport hub of commercial economy.
The construction of subway clearly dig with tunneling point, subsurface excavation method builds that subway cost is relatively big, difficulty of construction high, precision controlling difficulty, by contrast, the advantage of cut and cover method is just highlighted, and constructs convenient, safety coefficient is high, cost is relatively small, but the thing followed, and subway is built in open cut certainly will affect that traffic above-ground is unobstructed, affect surface structures stably by excavated pavement.Therefore, the impact of the contiguous existing building pile foundation of research open cut of subway station has great importance.
Traditional subway station experimental study form is comparatively single, monitoring difficulty is higher in real time, and experiment process is complex, and cannot accomplish that the real time contrast of various working analyzes, this brings bigger obstruction for subway foundation pit stability study, it is impossible to obtain comprehensive comprehensively general result.
Summary of the invention
The technical problem to be solved is to provide model test apparatus and the operational approach that adjacent building basis is affected by a kind of open-cut foundation ditch, assembled structure, there is relative analysis function, monitoring means is advanced, and possess the function that various working carries out simultaneously, real time contrast's property analysis of many group test different parameters can be carried out, substantially increase test efficiency and precision, making result of the test more general representative, scientific research and technology for excavation of subway foundation pit provide helpful reference and guidance.
For solving above-mentioned technical problem, the technical solution used in the present invention is: the model test apparatus that adjacent building basis is affected by a kind of open-cut foundation ditch, system is analyzed including Work condition analogue framework, building analog systems, comprehensive monitoring, Work condition analogue framework includes structural framing and testing stand base, and structural framing is looped around the surrounding of testing stand base；Building analog systems is two groups, two components are located on testing stand base, often group building analog systems includes simulation Rock And Soil, tank, lifting water tank, prefabricated pile basis, load, simulation Rock And Soil is placed on testing stand base, lifting water tank connects with tank, tank connects with simulation Rock And Soil, and prefabricated pile basis extend in simulation Rock And Soil, and load is placed on prefabricated pile basis；Described comprehensive monitoring is analyzed system and is included displacement inductive head and comprehensive monitoring analysing terminal, and displacement inductive head is embedded in simulation Rock And Soil, is connected with comprehensive monitoring analysing terminal by pre-buried wiring.
Further technical scheme, described two groups of building analog systems mirror images set up separately on testing stand base.
Further technical scheme, the tank in two groups of building analog systemss is adjacent, leaves the space of placed comprehensive monitoring analysing terminal between two tanks, and lifting water tank lifts along the track of sink outer walls, and the bottom of lifting water tank is provided with the water pipe connected with bottom of gullet.
Further technical scheme, it is provided with substrate sandwich between testing stand base and simulation Rock And Soil, described wiring makes wiring level turn vertical trend by roller of transferring or vertical turning is horizontally orientated to, and wherein, the wiring being horizontally orientated to laid along testing stand base is arranged in substrate sandwich.
Further technical scheme, the side that tank is affixed with simulation Rock And Soil is provided with some permeable holes.
A kind of open-cut foundation ditch operational approach on the model test apparatus that adjacent building basis affects, comprises the following steps:
The simulation Rock And Soil of A, configuration and foundation ditch analog material, builds building analog systems, simultaneously pre-buried displacement inductive head, wiring in simulation Rock And Soil, and wiring causes comprehensive monitoring analysing terminal, pre-buried for prefabricated pile basis extremely design is specified position simultaneously；
B, both sides prefabricated pile basis be respectively provided with the load of Different Weight, be simulated the excavation simulation of Rock And Soil, the existing foundation level two groups of tests caused carries out Comprehensive Comparison with vertical displacement, completes the contrast model test under different load mode；
C, again filling simulation Rock And Soil, the weight making both sides load is identical, adjusts side tank height, controlling groundwater level, carries out excavation of foundation pit research and application data, complete identical building basic displacement contrast test under having water and anhydrous state；
The discrepancy in elevation of D, design both sides load and both sides lifting water tank, carries out different load case, differently descends excavation of foundation pit displacement monitoring orthogonal test in water level elevation situation, by the relative analysis of comprehensive monitoring analysing terminal.
Adopt and have the beneficial effects that produced by technique scheme:
1) simple operation, Stability Analysis of Structures, it is possible to basis and the agent structure of existing building is carried out accurate simulation, and controlling water level absolute altitude can be carried out by adjustment water tank, carry out level of ground water simulation；
2) building analog systems is for simulating basis and the upper body structure of existing building, loads, by changing, the influence of foundation excavation existing building basis contrast test that can carry out under different load mode, different level of ground water；
3) comprehensive monitoring is analyzed system and can comprehensively be analyzed excavation of subway foundation pit to the level on existing building basis, the isoparametric impact of vertical displacement, and the correction data analysis that many group tests carry out simultaneously can be carried out, efficiently convenient, draw general result, there is certain representative and reference value, provide theoretical reference for construction.
Accompanying drawing explanation
Fig. 1 is the cutting structural representation of one embodiment of apparatus of the present invention；
In figure: 1, structural framing；2, substrate sandwich；3, testing stand base；4, simulation Rock And Soil；5, prefabricated pile basis；6, load；7, displacement inductive head；8, wiring；9, turnover roller；10, comprehensive monitoring analysing terminal；11, lifting water tank；12, tank.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
The structure of the present invention is as shown in Figure 1, system is analyzed including Work condition analogue framework, building analog systems, comprehensive monitoring, Work condition analogue framework includes structural framing 1 and testing stand base 3, and structural framing 1 is looped around the surrounding of testing stand base 3, forms the enclosing structure that surrounding seals；Building analog systems is two groups, two groups of mirror images set up separately on testing stand base 3, often group building analog systems includes simulation Rock And Soil 4, tank 12, lifting water tank 11, prefabricated pile basis 5, load 6, simulation Rock And Soil 4 is placed on testing stand base 3, lifting water tank 11 connects with tank 12, and the side that tank 12 and simulation Rock And Soil 4 are affixed is provided with some permeable holes, and tank 12 connects with simulation Rock And Soil 4, prefabricated pile basis 5 extend in simulation Rock And Soil 4, and load 6 is placed on prefabricated pile basis 5；Comprehensive monitoring is analyzed system and is included displacement inductive head 7 and comprehensive monitoring analysing terminal 10, and displacement inductive head 7 is embedded in simulation Rock And Soil 4, is connected with comprehensive monitoring analysing terminal 10 by pre-buried wiring 8.Tank 12 in two groups of building analog systemss is adjacent, leaves the space of placed comprehensive monitoring analysing terminal 10 between two tanks 12, and lifting water tank 11 lifts along the track of tank 12 outer wall, and the bottom of lifting water tank 11 is provided with and the water pipe connected bottom tank 12.
Wherein, Work condition analogue framework is used for simulating original position ground geological environment；Building analog systems, for simulating basis and the upper body structure of existing building, loads, by changing, the test simulation that can carry out under different load mode；Comprehensive monitoring analyzes system can comprehensively analyze excavation of subway foundation pit to the level on existing building basis, the isoparametric impact of vertical displacement, and can carry out the correction data analysis that many group tests carry out simultaneously, efficiently convenient.
The free structure framework of Work condition analogue framework is for ensureing the Stability Analysis of Structures of simulation Rock And Soil, lifting water tank and other pilot systems, simulation Rock And Soil is the test material composition developed after similar proportioning according to on-the-spot Geotechnical Parameter, at utmost simulated field operating mode, lifting water tank is connected with bottom of gullet, can pass through to lift the water level in water tank position adjustment tank and then simulated groundwater position；Substrate sandwich is free space below Rock And Soil, for monitoring the bottom traction of wiring.
Building analog systems is made up of prefabricated pile basis, load etc., and prefabricated pile basis is used for simulating existing building pile foundation, and load is used for simulating superstructure agent structure, by adjusting the test under load weight and then the different load mode of simulation.
Comprehensive monitoring is analyzed system and is made up of devices such as high precision displacement inductive head, horizontal wiring, vertical wiring, turnover roller and comprehensive monitoring analysing terminals, displacement inductive head, horizontal wiring and turnover roller composition fixed pulley system, the level caused by excavation of foundation pit and vertical displacement are transferred to monitoring analysing terminal, displacement parameter is converted to the signal of telecommunication, test data will be organized more and integrate contrast, draw conclusion (of pressure testing), there is certain representative and universality.
The operational approach of the present invention, comprises the following steps:
The simulation Rock And Soil 4 of A, configuration and foundation ditch analog material, build building analog systems, pre-buried displacement inductive head 7, wiring 8 in simulation Rock And Soil 4 simultaneously, and wiring 8 is caused comprehensive monitoring analysing terminal 10, simultaneously by pre-buried for prefabricated pile basis 5 to design appointment position；
B, both sides prefabricated pile basis 5 be respectively provided with the load 6 of Different Weight, be simulated the excavation simulation of Rock And Soil 4, the existing foundation level two groups of tests caused carries out Comprehensive Comparison with vertical displacement, completes the contrast model test under different load 6 pattern；
C, again filling simulation Rock And Soil 4, the weight making both sides load 6 is identical, adjusts side tank height, controlling groundwater level, carries out excavation of foundation pit research and application data, complete identical building basic displacement contrast test under having water and anhydrous state；
The discrepancy in elevation of D, design both sides load 6 and both sides lifting water tank 11, carries out different load case, differently descends excavation of foundation pit displacement monitoring orthogonal test in water level elevation situation, by the relative analysis of comprehensive monitoring analysing terminal 10.
Work condition analogue framework in the present invention is used for simulating original position ground geological environment；Building analog systems, for simulating basis and the upper body structure of existing building, loads, by changing, the test simulation that can carry out under different load mode；Comprehensive monitoring analyzes system can comprehensively analyze excavation of subway foundation pit to the level on existing building basis, the isoparametric impact of vertical displacement, and the correction data analysis that many group tests carry out simultaneously can be carried out, efficiently convenient, draw general result, there is certain representative and reference value, provide theoretical reference for construction.
Claims (6)
1. the model test apparatus that adjacent building basis is affected by an open-cut foundation ditch, it is characterized in that, system is analyzed including Work condition analogue framework, building analog systems, comprehensive monitoring, Work condition analogue framework includes structural framing (1) and testing stand base (3), and structural framing (1) is looped around the surrounding of testing stand base (3)；Building analog systems is two groups, two components are located on testing stand base (3), often group building analog systems includes simulation Rock And Soil (4), tank (12), lifting water tank (11), prefabricated pile basis (5), load (6), simulation Rock And Soil (4) is placed on testing stand base (3), lifting water tank (11) and tank (12), tank (12) connects with simulation Rock And Soil (4), prefabricated pile basis (5) extend in simulation Rock And Soil (4), and load (6) is placed on prefabricated pile basis (5)；Described comprehensive monitoring is analyzed system and is included displacement inductive head (7) and comprehensive monitoring analysing terminal (10), and displacement inductive head (7) is embedded in simulation Rock And Soil (4), is connected with comprehensive monitoring analysing terminal (10) by pre-buried wiring (8).
2. the model test apparatus that adjacent building basis is affected by open-cut foundation ditch according to claim 1, it is characterised in that described two groups of building analog systems mirror images set up separately on testing stand base (3).
3. the model test apparatus that adjacent building basis is affected by open-cut foundation ditch according to claim 1, it is characterized in that, tank (12) in two groups of building analog systemss is adjacent, the space of placed comprehensive monitoring analysing terminal (10) is left between two tanks (12), lifting water tank (11) lifts along the track of tank (12) outer wall, and the bottom of lifting water tank (11) is provided with the water pipe connected with tank (12) bottom.
4. the model test apparatus that adjacent building basis is affected by open-cut foundation ditch according to claim 1, it is characterized in that, it is provided with substrate sandwich (2) between testing stand base (3) and simulation Rock And Soil (4), described wiring (8) makes wiring (8) level turn vertical trend by roller (9) of transferring or vertical turning is horizontally orientated to, wherein, the wiring (8) being horizontally orientated to laid along testing stand base (3) is arranged in substrate sandwich (2).
5. the model test apparatus that adjacent building basis is affected by open-cut foundation ditch according to claim 1, it is characterised in that the side that tank (12) is affixed with simulation Rock And Soil (4) is provided with some permeable holes.
6. the open-cut foundation ditch operational approach on the model test apparatus that adjacent building basis affects, it is characterised in that comprise the following steps:
The simulation Rock And Soil (4) of A, configuration and foundation ditch analog material, build building analog systems, pre-buried displacement inductive head (7), wiring (8) in simulation Rock And Soil (4) simultaneously, and wiring (8) is caused comprehensive monitoring analysing terminal (10), simultaneously by pre-buried for prefabricated pile basis (5) to design appointment position；
B, both sides prefabricated pile basis (5) be respectively provided with the load (6) of Different Weight, it is simulated the excavation simulation of Rock And Soil, the existing foundation level two groups of tests caused carries out Comprehensive Comparison with vertical displacement, completes the contrast model test under different load (6) pattern；
C, again filling simulation Rock And Soil, the weight making both sides load (6) is identical, adjusts side tank height, controlling groundwater level, carries out excavation of foundation pit research and application data, complete identical building basic displacement contrast test under having water and anhydrous state；
D, design both sides load (6) and both sides lifting water tank (11) the discrepancy in elevation, carry out different load case, differently descend excavation of foundation pit displacement monitoring orthogonal test in water level elevation situation, by the relative analysis of comprehensive monitoring analysing terminal (10).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110631560A (en) * | 2019-08-13 | 2019-12-31 | 中铁上海工程局集团有限公司 | Underground excavation interval monitoring and measuring method for subway station in dense building area |
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| JP4378244B2 (en) * | 2004-08-23 | 2009-12-02 | 株式会社竹中工務店 | Loading test method for piled raft foundation |
| CN201843152U (en) * | 2010-10-19 | 2011-05-25 | 同济大学 | Simulation tester for construction and monitoring of deep foundation pit engineering |
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| CN103454400A (en) * | 2013-07-11 | 2013-12-18 | 北京工业大学 | Model box applied to large stereoscopic synthesis simulation test bench in geotechnical engineering |
| CN204590103U (en) * | 2015-02-04 | 2015-08-26 | 山东大学 | Base Pit Excavation Simulation device under hypergravity condition |
| CN205712226U (en) * | 2016-04-29 | 2016-11-23 | 石家庄铁道大学 | The model test apparatus that adjacent building basis is affected by open-cut foundation ditch |
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2016
- 2016-04-29 CN CN201610276119.0A patent/CN105780828B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4378244B2 (en) * | 2004-08-23 | 2009-12-02 | 株式会社竹中工務店 | Loading test method for piled raft foundation |
| CN201843152U (en) * | 2010-10-19 | 2011-05-25 | 同济大学 | Simulation tester for construction and monitoring of deep foundation pit engineering |
| CN102914632A (en) * | 2012-10-16 | 2013-02-06 | 武汉理工大学 | Multifunctional geotechnical model test chamber |
| CN103454400A (en) * | 2013-07-11 | 2013-12-18 | 北京工业大学 | Model box applied to large stereoscopic synthesis simulation test bench in geotechnical engineering |
| CN204590103U (en) * | 2015-02-04 | 2015-08-26 | 山东大学 | Base Pit Excavation Simulation device under hypergravity condition |
| CN205712226U (en) * | 2016-04-29 | 2016-11-23 | 石家庄铁道大学 | The model test apparatus that adjacent building basis is affected by open-cut foundation ditch |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110631560A (en) * | 2019-08-13 | 2019-12-31 | 中铁上海工程局集团有限公司 | Underground excavation interval monitoring and measuring method for subway station in dense building area |
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Inventor after: Zhang Jian Inventor after: Du Yanliang Inventor after: Zhao Weigang Inventor after: Wang Jingchun Inventor after: Gao Yang Inventor after: Li Jianzhi Inventor before: Du Yanliang Inventor before: Zhang Jian Inventor before: Zhao Weigang Inventor before: Wang Jingchun Inventor before: Gao Yang Inventor before: Li Jianzhi |
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