CN105735377A - Adjustable waterproof foundation pit supporting device based on foundation pit excavation model test - Google Patents
Adjustable waterproof foundation pit supporting device based on foundation pit excavation model test Download PDFInfo
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- CN105735377A CN105735377A CN201610204554.2A CN201610204554A CN105735377A CN 105735377 A CN105735377 A CN 105735377A CN 201610204554 A CN201610204554 A CN 201610204554A CN 105735377 A CN105735377 A CN 105735377A
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- foundation pit
- retaining wall
- support
- excavation
- model test
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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
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses an adjustable waterproof foundation pit supporting device based on a foundation pit excavation model test. The device comprises a retaining wall and braces. A plurality of rows of bolts are arranged on the upper portion of the retaining wall. A retaining wall support is fixed through the bolts. A plurality of fixing bolts are reserved in the middle of the retaining wall. The two sides of the retaining wall are provided with waterstop rubber strips. The waterstop rubber strips ensures that the surfaces, in contact with a model box, of the retaining wall in the moving process are water-tight. One end of each brace is provided with an internally threaded port which is in threaded connection with the corresponding fixing bolt to achieve installation of the brace. The adjustable waterproof foundation pit supporting device is reasonable in structure and convenient to install and operate and can be used for simulating displacement and deformation of the flexible retaining wall in the foundation pit excavation model test under a groundwater environment, and an effective means is provided for carrying out related foundation pit excavation model tests and research.
Description
Technical field
The present invention relates to a kind of scalable waterproof foundation pit support device based on excavation of foundation pit model test, particularly relate to the flexible retaining wall excavation of foundation pit model test apparatus that can simultaneously consider groundwater environment and the change of retaining wall embedded depth, conveniently excess pore water pressure, soil pressure and foundation pit deformation etc. in the Excavation Process soil body are monitored.
Background technology
In strand, the deep-foundation pit engineering of riparian area face rich groundwater, construction environment is complicated and difficulty of construction is big waits challenge, and foundation pit deformation that wherein groundwater effect causes and destabilization problems are one of material risk sources of such regional deep-foundation pit engineering.
Current excavation of foundation pit model test is left out groundwater effect more, and the test soil body selects dry sand, the main soil pressure monitoring the excavation of foundation pit soil body and foundation pit deformation, has larger difference with the excavation of foundation pit situation having groundwater effect.Consider groundwater effect excavation of foundation pit model test, have research (Sun Wei. the test of coastal region deep basal pit character and theoretical research [D]. Zhejiang University, 2015.) adopt fixed retaining wall method, the method can only monitor excess pore water pressure in the soil body, it is impossible to obtains soil pressure and foundation pit deformation data accurately.Separately have research (Peng Shuquan. sand barricade failure mechanism grand thin see research [D]. Tongji University, 2007.) adopt thin film to connect retaining wall and model casing by smearing epoxy resin after the coarse process of method of corona, the method can obtain excess pore water pressure, soil pressure and foundation pit deformation data in the test soil body, but thin film Joining Technology is complex, when lateral diaphragm wall displacement is bigger, thin film is likely in moving process owing to soil particle friction causes breakage, it is impossible to smoothly completes test or is repeated test.Therefore, more simply, the movement of retaining wall is the problem needing in strand, riverine excavation of foundation pit model test to solve under simulated groundwater environment exactly.
Lot of experiments research shows that the stress of foundation ditch, deformation and stability and retaining wall embedded depth have much relations.In Practical Project; design usually can comprise multiple retaining wall embedded depth scheme; method finally by finite element numerical calculating, engineering experience analogy determines unique retaining wall embedded depth design, still lacks the relevant foundation ditch design reference suggestion that the retaining wall excavation of foundation pit model test of the relevant adjusting penetrating degree of depth provides.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of scalable waterproof foundation pit support device based on excavation of foundation pit model test, the retaining wall solved under effectively accurate simulated groundwater environment in Excavation Process moves problem the impact that repeatable experimental study difference retaining wall embedded depth is on foundation ditch Water And Earth Pressures and deformation.
The technical solution adopted for the present invention to solve the technical problems is: a kind of scalable waterproof foundation pit support device based on excavation of foundation pit model test, this device includes retaining wall and support, described retaining wall top is provided with multiple tracks bolt, is bolted retaining wall support；Being reserved with some fixing bolts in the middle part of described retaining wall, both sides are provided with watertight rubber bar；Described watertight rubber bar ensures not leak with model casing contact surface in retaining wall moving process；One end of described support has inner thread mouth, and inner thread mouth is connected with fixing bolt thread, it is achieved the installation of support.
Further, described support includes solid aluminum bar, expansion link and support connecting bolt；Having some grooves on described solid aluminum bar, one end has inner thread mouth；Described expansion link is hollow aluminum pipe, and expansion link has some screwed holes；Described support connecting bolt props up the groove of solid aluminum bar through the screwed hole on expansion link so that solid aluminum bar and expansion link compact siro spinning technology.
Further, described support includes the first support bar, the second support bar and sleeve；One end of described first support bar has external screw thread；One end of described second support bar has inner thread mouth, and the other end has external screw thread；Described sleeve has female thread passage, and threaded one end connects the first support bar, threaded second support bar of the other end.
Further, described watertight rubber bar is made up of semi-cylindrical rubber cavity and sheet rubber；Described sheet rubber embeds in the line of rabbet joint of retaining wall side, smears silica gel sealing and is arranged on retaining wall.
Further, described retaining wall is aluminium sheet, and the retaining wall rigidity that its thickness need to be simulated by model test is determined.
Further, described retaining wall support is corrosion resistant plate.
Further, two sides that described model casing contacts with retaining wall are safety glass.
Further, the position of described bolt is determined by retaining wall embedded depth, and number of channels is tested, by the excavation of foundation pit changing retaining wall embedded depth, the group number needing to adjust and determined.
Further, the quantity of described fixing bolt and position are supported by foundation ditch quantity and position are determined.
Compared with prior art, the invention has the beneficial effects as follows:
1, in the present invention can there is corresponding displacement owing to cheating inside and outside soil pressure difference in retaining wall in Excavation Process, excess pore water pressure in soil mass of foundation pit, soil pressure and foundation pit deformation under the different excavating condition of monitoring, more can reflect the Water And Earth Pressures in actual base pit engineering digging process and foundation pit deformation response compared to the test method of fixed retaining wall.
2, the present invention can the base pit engineering environment of simulated groundwater effect, adopt customization watertight rubber bar sealing be made up of semi-cylindrical rubber cavity and sheet rubber；Sheet rubber is embedded in the line of rabbet joint of retaining wall side, smear silica gel sealing and watertight rubber bar is arranged on retaining wall, the purpose preventing from leaking can be reached on the one hand, ensure that in retaining wall moving process, sealing rubber strip will not peel off on the other hand；Semi-cylindrical rubber cavity can be crushed in retaining wall moving process, increasing the contact surface of watertight rubber bar and safety glass, be further ensured that retaining wall sealing rubber strip and model casing contact surface in moving process do not leak, operation principle is simple, device is simple and easy, installs easy to operate.
3, the present invention is provided with the multiple tracks bolt for fixed retaining wall support on retaining wall top, the test simulation of different retaining wall embedded depth can be realized, compared to conventional needle, the excavation models of different embedded depths is tested the method that the retaining wall needing to make differing heights completes test, the retaining wall eliminating differing heights makes this step, has saved experimentation cost and modelling time.
4, the present invention can propping operation in accurate simulation Excavation Process, the soil body that will not foundation ditch do not excavated in inner support installation process has disturbing influence；It is threadably secured between inner support with retaining wall and is connected, inner support frame be located on retaining wall than traditional excavation models test or lie directly against the method that retaining wall realizes propping, more can reflect propping situation when actual base pit engineering excavates objectively；Realized the simulation of internal support of foundation pit rigidity by control solid aluminum shank diameter and hollow aluminum bar wall thickness, reflect the inner support Effects on Engineering to excavation of foundation pit more objectively..
5, the present invention adopts retractable supports element, the excavation of foundation pit test of different in width can be simulated, the support of regular length or retractable supports is adopted only to be used for realizing supporting the experimental considerations installed compared to traditional excavation of foundation pit model test, same set of assay device can be adopted to carry out the excavation of foundation pit test organizing different in width more, decreasing the repacking to assay device, saved experimentation cost and modelling time, operation principle is simple, easy to operate, there is very big practicality.
6, the present invention according to the demand of geotechnical model test, can adjust the quantity of inner support element, and the inner support on retaining wall fixes position and the quantity of bolt, the excavation situation of the different foundation ditch of simulation.
Accompanying drawing explanation
The scalable waterproof foundation pit support device side view that Fig. 1 (a) supports for adopting the first kind.
The scalable waterproof foundation pit support device side view that Fig. 1 (b) supports for adopting Equations of The Second Kind.
Fig. 2 is retaining wall plane graph.
Fig. 3 is sealing rubber strip profile.
The scalable waterproof foundation pit support device that Fig. 4 (a) supports for adopting first kind application schematic diagram in model test.
The scalable waterproof foundation pit support device that Fig. 4 (b) supports for adopting Equations of The Second Kind application schematic diagram in model test.
In figure: retaining wall 1；Retaining wall support 2；Bolt 3；Watertight rubber bar 4；Semi-cylindrical rubber cavity 4-1；Sheet rubber 4-2；Fixing bolt 5；Support 6；Solid aluminum bar 6-1；Hollow aluminum bar 6-2；Support connecting bolt 6-3；First support bar 6-4；Second support bar 6-5；Sleeve 6-6；Model casing 7；Model casing base 8；Reaction frame 9；The test soil body 10.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
As shown in Fig. 1 (a), Fig. 1 (b), the present invention is based on the scalable waterproof foundation pit support device of excavation of foundation pit model test, including retaining wall 1 and support 6.Described retaining wall 1 top is provided with multiple tracks bolt 3, by bolt 3 fixed retaining wall support 2；Being reserved with some fixing bolts 5 in the middle part of described retaining wall 1, both sides are provided with watertight rubber bar 4；Described watertight rubber bar 4 ensures not leak with model casing 7 contact surface in retaining wall 1 moving process；One end of described support 6 has inner thread mouth, and inner thread mouth is threadeded with fixing bolt 5, it is achieved support the installation of 6.
Preferably, described support 6 can adopt following two form:
One. as shown in Fig. 1 (a), described support 6 includes solid aluminum bar 6-1, expansion link 6-2 and supports connecting bolt 6-3；Having some grooves on described solid aluminum bar 6-1, one end has inner thread mouth；Described expansion link 6-2 is hollow aluminum pipe, and expansion link 6-2 has some screwed holes；Described support connecting bolt 6-3 selects M6 bolt, props up the groove of solid aluminum bar 6-1 through the screwed hole on expansion link 6-2 so that solid aluminum bar 6-1 and expansion link 6-2 compact siro spinning technology.
Two. as shown in Fig. 1 (b), described support 6 includes the first support bar 6-4, the second support bar 6-5 and sleeve 6-6；One end of described first support bar 6-4 has external screw thread；One end of described second support bar 6-5 has inner thread mouth, and the other end has external screw thread；Described sleeve 6-6 has female thread passage, and threaded one end connects the first support bar 6-4, the threaded second support bar 6-5 of the other end.
As in figure 2 it is shown, described retaining wall 1 is certain thickness aluminium sheet, the retaining wall Rigidity Calculation that its thickness need to be simulated by model test obtains.Described retaining wall support 2 is made up of the corrosion resistant plate that thickness is 20mm.M8 bolt selected by described bolt 3, and its position is determined by the embedded depth of retaining wall 1, and number of channels is tested, by the excavation of foundation pit changing retaining wall embedded depth, the group number needing to adjust and determined.M8 bolt selected by described fixing bolt 5, and quantity and position that its quantity and position are supported by foundation ditch are determined.
As it is shown on figure 3, described watertight rubber bar 4 is made up of semi-cylindrical rubber cavity 4-1 and sheet rubber 4-2；Described sheet rubber 4-2 embeds in the line of rabbet joint of retaining wall 1 side, smears silica gel sealing and is arranged on retaining wall 1, can reach the purpose preventing from leaking on the one hand, ensures that in retaining wall moving process, sealing rubber strip will not peel off on the other hand；Described semi-cylindrical rubber cavity 4-1 can be crushed in retaining wall moving process, increases the contact surface of watertight rubber bar and safety glass, is further ensured that retaining wall sealing rubber strip and model casing contact surface in moving process do not leak.
As shown in Fig. 4 (a), Fig. 4 (b), present invention can apply to excavation of foundation pit model test under groundwater environment.Two sides that described model casing 7 contacts with retaining wall 1 are 20mm thickness safety glass, it is simple to the monitoring of retaining wall and land movement in test, and for ensureing, in retaining wall 1 moving process, drainage does not occur, the manufactured size required precision of model casing 7 is higher.
The work process of the present invention is as follows: first the design embedded depth according to retaining wall 1 selects the position of bolt 3 to be fixed on retaining wall 1 by barricade support 2；Retaining wall 1 is placed in model casing 7, makes the watertight rubber bar 4 on retaining wall 1 vertical with the safety glass of model casing 7 both sides and be adjacent to；And the test soil body 10 inserted by backward model casing 7, bury pore water pressure sensor and soil pressure cell underground, by fully saturated for the test soil body 10 simultaneously；Installation position displacement sensor monitoring soil deformation and retaining wall displacement；Successively the test soil body 10 on the left of excavation retaining wall 1, successively excavates successively installation support 6；It is connected with the fixing bolt 5 on retaining wall 1 by supporting the female thread of 6 one end, by adjusting the length supporting 6 so as to hold out against the reaction frame 9 being jointly fixed on model casing base 8 with model casing 7, completes to support the installation of 6.In whole excavation of foundation pit process of the test, monitor the excess pore water pressure in the soil body, soil pressure and foundation pit deformation, it is thus achieved that correlation test data, provide certain advisory opinion for similar design of foundation pit.
Claims (9)
1. the scalable waterproof foundation pit support device based on excavation of foundation pit model test, this device includes retaining wall (1) and supports (6), it is characterized in that, described retaining wall (1) top is provided with multiple tracks bolt (3), by bolt (3) fixed retaining wall support (2)；Described retaining wall (1) middle part is reserved with some fixing bolts (5), and both sides are provided with watertight rubber bar (4)；Described watertight rubber bar (4) ensures not leak with model casing (7) contact surface in retaining wall (1) moving process；One end of described support (6) has inner thread mouth, and inner thread mouth is threadeded with fixing bolt (5), it is achieved support the installation of (6).
2. a kind of scalable waterproof foundation pit support device based on excavation of foundation pit model test according to claim 1, it is characterized in that, described support (6) includes solid aluminum bar (6-1), expansion link (6-2) and supports connecting bolt (6-3)；Having some grooves on described solid aluminum bar (6-1), one end has inner thread mouth；Described expansion link (6-2) is hollow aluminum pipe, and expansion link (6-2) has some screwed holes；Described support connecting bolt (6-3) props up the groove of solid aluminum bar (6-1) through the screwed hole on expansion link (6-2) so that solid aluminum bar (6-1) and expansion link (6-2) compact siro spinning technology.
3. a kind of scalable waterproof foundation pit support device based on excavation of foundation pit model test according to claim 1, it is characterized in that, described support (6) includes the first support bar (6-4), the second support bar (6-5) and sleeve (6-6)；One end of described first support bar (6-4) has external screw thread；One end of described second support bar (6-5) has inner thread mouth, and the other end has external screw thread；Described sleeve (6-6) has female thread passage, and threaded one end connects the first support bar (6-4), threaded second support bar (6-5) of the other end.
4. a kind of scalable waterproof foundation pit support device based on excavation of foundation pit model test according to claim 1, it is characterized in that, described watertight rubber bar (4) is made up of semi-cylindrical rubber cavity (4-1) and sheet rubber (4-2)；Described sheet rubber (4-2) embeds in the line of rabbet joint of retaining wall (1) side, smears silica gel sealing and is arranged on retaining wall (1).
5. a kind of scalable waterproof foundation pit support device based on excavation of foundation pit model test according to claim 1, it is characterised in that described retaining wall (1) is aluminium sheet, and the retaining wall rigidity that its thickness need to be simulated by model test is determined.
6. a kind of scalable waterproof foundation pit support device based on excavation of foundation pit model test according to claim 1, it is characterised in that described retaining wall support (2) is corrosion resistant plate.
7. a kind of scalable waterproof foundation pit support device based on excavation of foundation pit model test according to claim 1, it is characterised in that two sides that described model casing (7) contacts with retaining wall (1) are safety glass.
8. a kind of scalable waterproof foundation pit support device based on excavation of foundation pit model test according to claim 1, it is characterized in that, the position of described bolt (3) is determined by retaining wall (1) embedded depth, and number of channels is tested, by the excavation of foundation pit changing retaining wall (1) embedded depth, the group number needing to adjust and determined.
9. a kind of scalable waterproof foundation pit support device based on excavation of foundation pit model test according to claim 1, it is characterised in that quantity and position that the quantity of described fixing bolt (5) and position are supported by foundation ditch are determined.
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| CN201610204554.2A CN105735377B (en) | 2016-04-01 | 2016-04-01 | A kind of adjustable waterproof foundation pit support device based on excavation of foundation pit model test |
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| CN201610204554.2A CN105735377B (en) | 2016-04-01 | 2016-04-01 | A kind of adjustable waterproof foundation pit support device based on excavation of foundation pit model test |
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| CN105735377B CN105735377B (en) | 2017-11-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107436280A (en) * | 2017-09-26 | 2017-12-05 | 中国科学院武汉岩土力学研究所 | Curtain withdrawal device and curtain withdrawal system |
| CN113049381A (en) * | 2021-03-11 | 2021-06-29 | 深圳市勘察研究院有限公司 | Foundation pit support simulation test device and system |
| CN114582219A (en) * | 2022-02-23 | 2022-06-03 | 山东高速工程建设集团有限公司 | Foundation pit adjoining building (structure) construction simulation device |
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