CN205506571U - Ground water level dynamic change's foundation ditch model test device can simulate - Google Patents

Ground water level dynamic change's foundation ditch model test device can simulate Download PDF

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Publication number
CN205506571U
CN205506571U CN201620271734.8U CN201620271734U CN205506571U CN 205506571 U CN205506571 U CN 205506571U CN 201620271734 U CN201620271734 U CN 201620271734U CN 205506571 U CN205506571 U CN 205506571U
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CN
China
Prior art keywords
model casing
retaining wall
model
foundation ditch
excavation
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Withdrawn - After Issue
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CN201620271734.8U
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Chinese (zh)
Inventor
应宏伟
章丽莎
魏骁
张金红
沈华伟
王小刚
朱成伟
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The utility model discloses a ground water level dynamic change's foundation ditch model test device can simulate. The device includes mold box, water tank, retaining wall and interior support. The mold box comprises model upset frame frame, toughened glass, mold box bottom plate, counter -force board, top frame and model tank base, the water tank sets up the upper right side in the mold box for water -level fluctuation in the control and the observation soil body, the retaining wall sets up in the mold box through the retaining wall support, supports in the mountable on it, the tight counter -force board in interior support top provides zhi fanli by the counter -force board, the response condition that foundation ditch after simulation excavation is accomplished is changed by groundwater, foundation ditch atress and the change rule of deformation after the excavation is accomplished are pursue in monitoring soil pressure, pore water pressure's change. The utility model discloses it is rational in infrastructure, easy and simple to handle, can be used to to simulate ground water level dynamic change to the foundation ditch atress and the influence of deformation under the most dangerous excavation operating mode, excavate model test and research provides an effective means for relevant foundation ditch.

Description

A kind of can the excavation models assay device that dynamically changes of simulated groundwater position
Technical field
This utility model relates to a kind of excavation models assay device, particularly relates to the dangerous working condition of Changes in underground water change Excavation models assay device, can be used for measuring the sound of the foundation pit earth pressure caused by Changes in underground water change and pore water pressure etc. Answer situation.
Background technology
In recent years, urban construction is fast-developing, and deep-foundation pit engineering increases increasingly, base pit engineering faces deep is deep, plane scale is big, The new trend that surrounding is complicated.Particularly in strand, the deep-foundation pit engineering of riparian area face rich groundwater especially, construction Circumstance complication and the difficulty of construction challenge such as big, foundation pit deformation that wherein groundwater effect causes and destabilization problems are in design of deep foundation pit Constantly paid high attention to in construction and paid attention to.Use the method simulating excavation of indoor geotechnical model test, in ground work Journey field is widely used, but tests under objectively and accurately simulated groundwater dynamically changes with regard to how by excavation models The response of foundation ditch Water And Earth Pressures is still problem in the urgent need to address.
The soil body many selections dry sand of excavation models test at present, puts aside the impact of subsoil water, the main research excavation of foundation pit soil body Soil pressure and the deformation of foundation ditch, but this type of research is not suitable for the excavation of foundation pit situation of groundwater effect.Consider constant phreatic table The excavation models test of effect, have research (Peng Shuquan. sand barricade failure mechanism is grand thin sees research [D]. Tongji University, 2007.) Using thin film to connect retaining wall and model casing by the method smearing epoxy resin after corona, the method can obtain in the test soil body super Quiet pore water pressure, soil pressure and foundation pit deformation data, but film corona technique is complex, and when lateral diaphragm wall displacement is bigger, thin film can Tear can occur in moving process or owing to soil particle friction causes breakage, it is impossible to smoothly complete test or carry out repeating test. Consider WATER LEVEL CHANGES impact excavation models test, have research (Sun Wei. the test of coastal region deep basal pit character and theory Research [D]. Zhejiang University, 2015.) method that uses fixed retaining wall, the method can only obtain excess pore water pressure in the soil body Situation of change, it is impossible to obtain accurately soil pressure change and foundation pit deformation data, with actual base pit engineering in dynamic level of ground water Response condition under Zuo Yong still suffers from larger difference.Therefore, the easiest, exactly simulated groundwater dynamically change and may move Retaining wall be strand, riverine excavation of foundation pit model test need solve subject matter.
Lot of experiments research shows that excavation of foundation pit completes (excavation of foundation pit is to the end, hole) operating mode and is usually the dangerous working condition of excavation of foundation pit. In Practical Project, excessive or unstable failure the situation of numerous foundation pit deformations also occurs often in excavation of foundation pit and completes this operating mode. Therefore Water And Earth Pressures and deformation response problem under excavation of foundation pit completes operating mode will become the most important thing in model investigation.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, this utility model provides can the excavation models that dynamically changes of simulated groundwater position Assay device, solves the most accurately controlling groundwater level and dynamically changes, and measure the soil pressure under foundation ditch dangerous working condition, hole Gap water pressure, and the problem such as the law of development determining foundation ditch stress and deformation.
This utility model solve its technical problem be the technical scheme is that a kind of can the foundation ditch that dynamically changes of simulated groundwater position Model test apparatus, including model casing, water tank, retaining wall and four parts of inner support;Described model casing by model casing framework, Safety glass, model casing base plate, reaction plate, top frame and model casing base composition;Before and after described model casing framework, both sides are installed Safety glass, facilitates the displacement of retaining wall in observation experiment and the deformation of soil mass of foundation pit, bottom fixed model box plate;Described instead Power plate is arranged on the left side of model casing, and reaction plate and model casing framework are each attached on model casing base, and top is connected by top frame; Described water tank is made up of the aluminium sheet of band limbers, bar shaped aluminium sheet, tank bracket, tank bracket fixed screw and rule, passes through Tank bracket is erected at the upper right side in model casing, for the SEA LEVEL VARIATION controlling and observing in the soil body;The aluminum of described band limbers Plate surface mount anti-filter geotextile, tests the loss of the soil body during preventing SEA LEVEL VARIATION;Described rule is pasted onto tempering glass On glass, can be used for directly observing and record SEA LEVEL VARIATION situation;The top of described retaining wall is fixed bolt by retaining wall and is connected gear soil Wall bracket, both sides installation watertight rubber bar, retaining wall is erected in model casing by retaining wall support;Described inner support is by solid Aluminum bar and inner support fix bolt composition;Described solid aluminum bar can be fixed bolt by the Inner bolt holes of one end with inner support and be connected peace Being loaded on retaining wall, the other end holds out against reaction plate, reaction plate provide support reaction;Joining water box is installed on the right side of described model casing Valve, for controlling the lifting of water level in water tank.The test soil body is watered and makes excavation of foundation pit completion status and make it fully saturated, Utilize pre-buried soil pressure sensor and the lower foundation pit earth pressure of pore water pressure sensor monitoring Changes in underground water change and pore water The response condition of pressure, utilizes displacement transducer monitoring retaining wall displacement and soil mass of foundation pit deformation.
Further, described model casing framework is welded by rustless steel steel bar thick for 10mm and stainless-steel sheet;Described tempering Glass is arranged on inside model casing framework by building glue;Described model casing base plate is the stainless-steel sheet that 10mm is thick;Described Reaction plate is the stainless-steel sheet that 10mm is thick;Described top frame is welded by the rustless steel steel bar that 20mm is thick;Described model casing Base is welded by I-steel;Described retaining wall is aluminium sheet, and its thickness is obtained by the retaining wall Rigidity Calculation of test simulation;Institute Stating retaining wall support is strip aluminium sheet thick for 20mm;Described valve is copper core valve.
Further, described model casing framework and reaction plate are fixed on model casing base by surrounding spot welding.
Further, the described water tank inwall by glass cement connection mode molding box.
Further, aluminium sheet and the tank bracket of described band limbers is tightened connection by tank bracket fixed screw.
Further, described watertight rubber bar is vertical with safety glass in process of the test is adjacent to, it is ensured that in retaining wall moving process Do not leak with model casing contact surface.
Compared with prior art, the beneficial effects of the utility model are:
1, the water tank in this utility model is erected in model casing, uses the gap between glass cement sealing radiator and model casing, band The aluminium sheet of limbers makes the water level in water tank connect with test soil body water level, can be by the water level in regulating tank to control examination Test soil body SEA LEVEL VARIATION;Surface of aluminum plate in band limbers pastes anti-filter geotextile, tests the soil body during preventing SEA LEVEL VARIATION Loss;Rule on water tank is pasted onto on safety glass, it is simple to directly observation and record SEA LEVEL VARIATION situation.
2, using removable retaining wall in this utility model, the thickness of retaining wall is obtained by the retaining wall rigidity conversion of test simulation, Situation about can be subjected to displacement with retaining wall in Practical Project and can be deformed is consistent;Retaining wall both sides are provided with watertight rubber bar, It is adjacent to the safety glass of model casing both sides, it is ensured that in retaining wall moving process, the contact surface with safety glass does not leaks.
3, the inner support in this utility model is arranged on retaining wall, can be according to the number of channels needing adjustment inner support of model test The inner support number of elements etc. supported with per pass.
Accompanying drawing explanation
Fig. 1 is can the excavation models assay device side view that dynamically changes of simulated groundwater position;
Fig. 2 is can the excavation models assay device top view that dynamically changes of simulated groundwater position;
Fig. 3 is foundation ditch plane of symmetry schematic diagram;
Fig. 4 is water tank side view;
Fig. 5 is retaining wall side view;
Fig. 6 is retaining wall and inner support scheme of installation;
In figure: model casing 1;Model casing framework 1-1;Safety glass 1-2;Model casing base plate 1-3;Reaction plate 1-4;Top frame 1-5; Model casing base 1-6;Water tank 2;Aluminium sheet 2-1 with limbers;Bar shaped aluminium sheet 2-2;Tank bracket 2-3;Tank bracket fixes spiral shell Silk 2-4;Rule 2-5;Retaining wall 3;Watertight rubber bar 3-1;Retaining wall support 4;Bolt 5 fixed by retaining wall;Inner support 6; Solid aluminum bar 6-1;Inner support fixes bolt 6-2;Valve 7;The test soil body 8.
Detailed description of the invention
With embodiment, this utility model is further illustrated below in conjunction with the accompanying drawings.
As shown in Figure 1, Figure 2, Figure 3 shows, this utility model can the excavation models assay device that dynamically changes of simulated groundwater position, bag Include model casing 1, water tank 2, retaining wall 3 and 6 four parts of inner support.
Described model casing 1 is by model casing framework 1-1, safety glass 1-2, model casing base plate 1-3, reaction plate 1-4, top frame 1-5 Form with model casing base 1-6;Described model casing framework 1-1 is by rustless steel steel bar thick for 10mm and stainless-steel sheet welding Become;Described safety glass 1-2 thickness is 20mm, is arranged on the model casing framework of model casing 1 both sides front and back by building glue Inside 1-1;Described model casing base plate 1-3 is the stainless-steel sheet that 10mm is thick;Described reaction plate 1-4 is the stainless of 10mm thickness Steel steel plate, is arranged on the left side of model casing 1, with model casing framework 1-1 by the stainless steel top frame 1-5 at top by surrounding spot welding Connect, be all fixed on the model casing base 1-6 that I-steel is welded by surrounding spot welding;Described top frame 1-5 is by 20mm Thick rustless steel steel bar is welded;Described water tank 2 is by the aluminium sheet 2-1 of the band limbers vertically placed, laterally disposed bar shaped aluminum The inwall of the safety glass 1-2 and model casing framework 1-1 of plate 2-2, front and back both sides connects formation by glass cement, is propped up by water tank Frame 2-3 is erected at the upper right side in model casing 1, for the SEA LEVEL VARIATION controlling and observing in the soil body;The aluminum of described band limbers Plate 2-1 and tank bracket 2-3 is tightened connection by tank bracket fixed screw 2-4;The aluminium sheet 2-1 surface mount of described band limbers Anti-filter geotextile, tests the loss of the soil body during preventing SEA LEVEL VARIATION;Described rule 2-5 is arranged on safety glass 1-2 On can be used for directly observing and record SEA LEVEL VARIATION situation;Described retaining wall 3 is erected in model casing 1 by retaining wall support 4, In moving process, keep vertical with safety glass 1-2 all the time;Described inner support 6 is arranged on by carrying out one end of aluminum bar 6-1 On retaining wall 3, the other end holds out against reaction plate 1-4, reaction plate 1-4 provide support reaction;Described valve 7 is high-quality copper core valve, It is arranged on the right side of model casing 1, the lifting of water level in controlling water tank 2;The described test soil body 8 uses standard Fujian fine sand, Cast by sand rain method and obtain.
As shown in Figure 4, described water tank 2 is by the aluminium sheet 2-1 of band limbers, bar shaped aluminium sheet 2-2, tank bracket 2-3, tank bracket Fixed screw 2-4 and rule 2-5 composition;The aluminium sheet 2-1 surface of described band limbers is placed with substantial amounts of water flowing circular hole, it is ensured that In process of the test, the water level in water tank connects and consistent with test soil body water level, to realize being controlled by the water level in regulating tank The SEA LEVEL VARIATION of the test soil body.
As it is shown in figure 5, retaining wall 3 both sides fluting installs watertight rubber bar 3-1;Described watertight rubber bar 3-1 is in process of the test Vertical with safety glass 1-2 it is adjacent to, it is ensured that in retaining wall moving process, retaining wall 3 does not leaks with model casing 1 contact surface; Described retaining wall 3 is certain thickness aluminium sheet, and its thickness is obtained by the retaining wall Rigidity Calculation of test simulation;Described retaining wall props up Frame 4 is the strip aluminium sheet that 20mm is thick.
As shown in Figure 6, described solid aluminum bar 6-1 can fix bolt 6-2 by the Inner bolt holes of one end and inner support and is connected and installed in On retaining wall 3;The diameter of described solid aluminum bar 6-1 is obtained by the Rigidity Calculation of the inner support of test simulation.
Work process of the present utility model is as follows: first retaining wall 3 is fixed bolt 5 even with retaining wall support 4 by retaining wall Connecting, then inner bolt and inner support by solid aluminum bar 6-1 one end are fixed bolt 6-2 and inner support 6 are arranged on retaining wall 3 On;The retaining wall 3 installing inner support 6 is erected in model casing 1 by retaining wall support 4 so that inner support 6 holds out against Reaction plate 1-4, retaining wall 3 is vertical with safety glass 1-2 to be adjacent to;Needed for then installing monitoring soil pressure on retaining wall 3 Soil pressure sensor;Sand rain method is used to cast the test soil body 8, by controlling sand shake-out device sieve aperture mesh sheet and test soil body surface The discrepancy in elevation obtains the soil body compactness needed for model test;The test soil body 8 is watered the excavation of foundation pit made as shown in Figure 1 and completes work Condition, carrys out the saturation testing soil body 8 by valve 7 water filling in model casing 1, and the strict waterflood injection rate of valve 7 that controls is to reduce examination Test the loss (the test soil body not washing away in foundation ditch) of the soil body, by the excavation of foundation pit plane of symmetry (passive zone of pit) in saturation history (clearly) water is arranged in region, side outside model casing lentamente;After the test soil body 8 is fully saturated, pore water pressure sensor is buried in boring underground, The backfill boring soil body;Soil body surface installation position displacement sensor inside and outside retaining wall 3 and foundation ditch, monitors the displacement of retaining wall 3 respectively With soil mass of foundation pit deformation;After completing above-mentioned test preparation, control in water tank 2 shown in rule 2-5 by valve 7 SEA LEVEL VARIATION to realize the change of foundation ditch Changes in underground water, locality descend foundation pit earth pressure, hole that water lever fluctuating causes Water pressure situation of change, the displacement of record retaining wall and soil mass of foundation pit deformation, it is thus achieved that the foundation ditch water and soil pressure that WATER LEVEL CHANGES causes The rules such as force-responsive, retaining wall displacement and foundation pit deformation.

Claims (6)

1. one kind can the excavation models assay device that dynamically changes of simulated groundwater position, it is characterised in that include model casing (1), Water tank (2), retaining wall (3) and (6) four parts of inner support;Described model casing (1) is by model casing framework (1-1), steel Change glass (1-2), model casing base plate (1-3), reaction plate (1-4), top frame (1-5) and model casing base (1-6) composition; Before and after described model casing framework (1-1), safety glass (1-2), bottom fixed model box plate (1-3) are installed in both sides;Described Reaction plate (1-4) is arranged on the left side of model casing (1), and reaction plate (1-4) and model casing framework (1-1) are each attached to model On bottom seat (1-6), top is connected by top frame (1-5);Described water tank (2) is by the aluminium sheet (2-1) of band limbers, bar Shape aluminium sheet (2-2), tank bracket (2-3), tank bracket fixed screw (2-4) and rule (2-5) composition, pass through water tank Support (2-3) is erected at the upper right side in model casing (1);Aluminium sheet (2-1) the surface mount anti-filter geotechnique of described band limbers Fabric;Described rule (2-5) is pasted onto on safety glass (1-2);The top of described retaining wall (3) is fixed by retaining wall Bolt (5) connects retaining wall support (4), and watertight rubber bar (3-1) is installed in both sides, and retaining wall (3) passes through retaining wall support (4) it is erected in model casing (1);Described inner support (6) is fixed bolt (6-2) by solid aluminum bar (6-1) and inner support Composition;Described solid aluminum bar (6-1) is fixed bolt (6-2) by the Inner bolt holes of one end and inner support and is connected and installed in gear soil On wall (3), the other end holds out against reaction plate (1-4);The valve (7) of joining water box (2) is installed on the right side of described model casing (1).
The most according to claim 1 a kind of can the excavation models assay device that dynamically changes of simulated groundwater position, its feature exists In, described model casing framework (1-1) is welded by rustless steel steel bar thick for 10mm and stainless-steel sheet;Described safety glass (1-2) it is arranged on model casing framework (1-1) inner side by building glue;Described model casing base plate (1-3) is that 10mm is thick Stainless-steel sheet;Described reaction plate (1-4) is the stainless-steel sheet that 10mm is thick;Described top frame (1-5) is by 20mm thickness Rustless steel steel bar is welded;Described model casing base (1-6) is welded by I-steel;Described retaining wall (3) is aluminium sheet; Described retaining wall support (4) is the strip aluminium sheet that 20mm is thick;Described valve (7) is copper core valve.
The most according to claim 1 a kind of can the excavation models assay device that dynamically changes of simulated groundwater position, its feature Being, described model casing framework (1-1) and reaction plate (1-4) are fixed on model casing base (1-6) by surrounding spot welding.
The most according to claim 1 a kind of can the excavation models assay device that dynamically changes of simulated groundwater position, its feature It is, the described water tank (2) inwall by glass cement connection mode molding box (1).
The most according to claim 1 a kind of can the excavation models assay device that dynamically changes of simulated groundwater position, its feature Being, aluminium sheet (2-1) and the tank bracket (2-3) of described band limbers are tightened connection by tank bracket fixed screw (2-4).
The most according to claim 1 a kind of can the excavation models assay device that dynamically changes of simulated groundwater position, its feature Being, described watertight rubber bar (3-1) is vertical with safety glass (1-2) in process of the test to be adjacent to.
CN201620271734.8U 2016-04-01 2016-04-01 Ground water level dynamic change's foundation ditch model test device can simulate Withdrawn - After Issue CN205506571U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105716959A (en) * 2016-04-01 2016-06-29 浙江大学 Foundation pit model test device capable of simulating dynamic change of underground water level
CN106501484A (en) * 2016-11-04 2017-03-15 中国科学院寒区旱区环境与工程研究所 A kind of pilot system of field variation of ecology and environment to underground water level response
CN109085320A (en) * 2018-07-13 2018-12-25 武汉科技大学 A kind of multi-functional retaining wall model test apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105716959A (en) * 2016-04-01 2016-06-29 浙江大学 Foundation pit model test device capable of simulating dynamic change of underground water level
CN105716959B (en) * 2016-04-01 2018-07-31 浙江大学 It is a kind of can simulated groundwater position dynamic change excavation models experimental rig
CN106501484A (en) * 2016-11-04 2017-03-15 中国科学院寒区旱区环境与工程研究所 A kind of pilot system of field variation of ecology and environment to underground water level response
CN106501484B (en) * 2016-11-04 2018-08-21 中国科学院寒区旱区环境与工程研究所 A kind of pilot system of field variation of ecology and environment to underground water level response
CN109085320A (en) * 2018-07-13 2018-12-25 武汉科技大学 A kind of multi-functional retaining wall model test apparatus

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Granted publication date: 20160824

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