CN105672380A - Test device and method for simulating installation of inner support in process of pit excavation - Google Patents

Test device and method for simulating installation of inner support in process of pit excavation Download PDF

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Publication number
CN105672380A
CN105672380A CN201610207386.2A CN201610207386A CN105672380A CN 105672380 A CN105672380 A CN 105672380A CN 201610207386 A CN201610207386 A CN 201610207386A CN 105672380 A CN105672380 A CN 105672380A
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CN
China
Prior art keywords
support
excavation
retaining
soil
test
Prior art date
Application number
CN201610207386.2A
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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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浙江大学
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Application filed by 浙江大学 filed Critical 浙江大学
Priority to CN201610207386.2A priority Critical patent/CN105672380A/en
Publication of CN105672380A publication Critical patent/CN105672380A/en

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00Testing foundations or foundation structures

Abstract

The invention discloses a test device and method for simulating installation of inner support in the process of pit excavation. The method for simulating installation of inner support in the process of pit excavation comprises the steps of: vertically excavating soil mass in a pit at the left side of a retaining wall layer by layer, continuously collecting related experimental data; after excavating the first-layer soil mass, installing first inner support through an inner support fixing bolt on the retaining wall and internal threads at one end of a solid aluminum rod, adjusting an expansion end of the inner support to be tightly against a reaction frame, continuing excavating; excavating the second-layer soil mass layer by layer, installing second inner support, and repeating the process until pit excavation is completed. The test device and method for simulating installation of inner support in the process of pit excavation can accurately simulate a supporting process in the process of pit excavation, realize real-time monitoring of related data in the whole process of pit excavation, and are simple in device and easy and simple in operation; the inner support can be adjusted to realize simulation of foundation pits with different excavation widths; the positions and quantity of fixing bolts of the inner support can be adjusted to meet simulation requirements of excavation of different foundation pits; and the retaining wall and inner support device can be repeatedly used to effectively save experimental cost.

Description

In a kind of Simulation of Excavation Process inner support install assay device and method
Technical field
The present invention relates to the experimental technique that the soil test model inner support in a kind of Geotechnical Engineering is installed and regulated, particularly relate to the excavation of foundation pit model of foundation ditch change width, installation and the adjustment of inner support in the Excavation Process of different excavation width can be simulated.
Background technology
China's sustained economic development in recent years, deep-foundation pit engineering problem has become a key areas of Geotechnical Engineering. In Deep Excavation, act on the active on retaining wall or passive earth pressure, cheat outer surface subsidence, to cheat the problem such as end uplift of soil and retaining wall displacement all closely bound up with engineering safety and environmental effect thereof, is the important research content of base pit engineering problem. Adopt indoor geotechnical model test simulating excavation operating mode, be widely used in Geotechnical Engineering field. Wherein, how by problem that indoor geotechnical model test objectively and accurately Simulation of Excavation Process is in the urgent need to address.
At present in excavation of foundation pit model test, for avoiding the disturbance to soil mass of foundation pit and retaining wall of the inner support Rig up error, the method generally adopting pre-buried inner support, the i.e. direct embedding retaining wall installing inner support. The method in Simulation of Excavation Process all inner supports all by stress, and excavate the lower section of the soil body with Practical Project middle and upper part and situation that inner support do not stress is not installed and inconsistent, can not propping operation in simulation of excavation process, it is impossible to reflect stress and the deformation of actual excavation pit. In tradition excavation of foundation pit model test, simulation propping operating mode is by being located on retaining wall by inner support frame or lying directly against the method realization of retaining wall. In this type of method, inner support is not fixing connection with retaining wall, fixes situation about being connected with inner support in actual base pit engineering with retaining wall and does not correspond. Therefore, more precisely the propping operating mode in Simulation of Excavation Process is the problem needing in excavation of foundation pit model test to solve.
In Practical Project, all kinds of foundation ditch change in size are bigger, for various sizes of excavation of foundation pit can be simulated by geotechnical model test as far as possible all sidedly, reduce the repacking to assay device as far as possible, save experimentation cost and modelling time, it is therefore desirable to adjustable support realizes the simulation of different in width Excavation Process.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides assay device and method that in a kind of Simulation of Excavation Process, inner support is installed.
The technical solution adopted for the present invention to solve the technical problems is: the assay device that in a kind of Simulation of Excavation Process, inner support is installed, this device includes the inner support that some roads are installed on retaining wall, and per pass inner support is made up of some inner support unit being positioned at same level height; Described inner support unit includes expansion link, solid aluminum bar and bolt; Described expansion link is hollow aluminum pipe, and wall thickness is calculated by support stiffness and obtains, and expansion link has some screwed holes; The diameter of described solid aluminum bar is calculated by support stiffness and obtains, and it has some grooves, and one end has inner thread mouth; Described bolt props up the groove of solid aluminum bar through the screwed hole on expansion link so that expansion link and solid aluminum bar compact siro spinning technology, does not slide in process of the test; Having some screwed holes on described retaining wall, the inner thread mouth on solid aluminum bar is connected with the fixing bolt thread of inner support through retaining wall screwed hole, so that inner support unit is fixed on retaining wall.
Further, the quantity and spacing of the groove on described solid aluminum bar is configured according to the requirement of model test inner support length.
Further, on described bolt and expansion link, the quantity and spacing of corresponding screwed hole is adjusted according to inner support stress size.
Further, the practical situation that the number of channels of described inner support and the support unit quantity and spacing of per pass inner support are tested according to excavation models is arranged.
The test method that in a kind of Simulation of Excavation Process, inner support is installed, the method is specific as follows:
After retaining wall is installed the fixing bolt of inner support and soil pressure cell, retaining wall is placed in soil test model casing; Filling test soil sample in model casing, at test installation position, soil sample surface displacement sensor; Ground floor excavation the soil body be ground surface to first inner support, the second layer excavation soil body be bottom first inner support to second inner support, by that analogy, define each excavation soil layer.
The soil body in the vertical hole successively excavating retaining wall side, carries out soil pressure in whole Excavation Process, cheats the continuous collecting of the sedimentation of the outer soil body, hole end uplift of soil and retaining wall displacement data. After completing ground floor soil excavation, fixing to the inner thread mouth of solid aluminum bar and the inner support on retaining wall bolt thread is connected, adjustable telescopic rod is so as to hold out against reaction frame, and tight a bolt guarantee expansion link and solid aluminum bar compact siro spinning technology, completes first inner support and installs. The stage excavation second layer soil body, adopts method as previously mentioned to install second inner support, and so forth until excavation of foundation pit completes.
Compared with prior art, the invention has the beneficial effects as follows:
1, 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.
2, the present invention adopts retractable supports element, the excavation of foundation pit test of different in width can be simulated, compare the support with traditional excavation of foundation pit model test employing regular length or retractable supports only for realizing supporting the experimental considerations installed, 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.
3, 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
Fig. 1 is the side elevational view of inner support element and retaining wall.
Fig. 2 (a) is expansion link profile.
Fig. 2 (b) is solid aluminum bar section figure.
Fig. 3 is retaining wall schematic diagram.
Fig. 4 is present invention application schematic diagram in excavation of foundation pit model test.
In figure: expansion link 1; Screwed hole 1-1; Solid aluminum bar 2; Groove 2-1; Inner thread mouth 2-2; Bolt 3; Inner support fixes bolt 4; Retaining wall 5; Retaining wall support 6; Fixing bolt 7; Soil test model casing 8; Model casing base 9; Reaction frame 10; Test soil sample 11.
Detailed description of the invention
Below in conjunction with drawings and embodiments, the present invention is further described.
As shown in Figure 1 to 4, the assay device that in a kind of Simulation of Excavation Process provided by the invention, inner support is installed, this device includes the inner support that some roads are installed on retaining wall 5, per pass inner support is made up of some inner support unit being positioned at same level height, and the practical situation that the number of channels of inner support and the support unit quantity and spacing of per pass inner support are tested according to excavation models is arranged.
As shown in Figure 1, 2, described inner support unit includes expansion link 1, solid aluminum bar 2 and bolt 3; Described expansion link 1 is hollow aluminum pipe, and wall thickness is calculated by support stiffness and obtains, and expansion link 1 has some screwed hole 1-1; The diameter of described solid aluminum bar 2 is calculated by support stiffness and obtains, and it has some groove 2-1, and one end has inner thread mouth 2-2, and the quantity and spacing of the groove 2-1 on described solid aluminum bar 2 can be configured according to the requirement of model test inner support length. Described bolt 3 props up the groove 2-1 of solid aluminum bar 2 through the screwed hole 1-1 on expansion link 1 so that expansion link 1 and solid aluminum bar 2 compact siro spinning technology, does not slide in process of the test; Described retaining wall 5 has some screwed holes, inner thread mouth 2-2 on solid aluminum bar 2 is threadeded with the fixing bolt 4 of inner support through retaining wall 5 screwed hole, so that inner support unit is fixed on retaining wall 5, on described bolt 3 and expansion link 1, the quantity and spacing of corresponding screwed hole 1-1 can be adjusted according to inner support stress size.
As it is shown on figure 3, give an embodiment of assay device of the present invention, retaining wall 5 top is by fixing bolt 7 fixed retaining wall support 6; The number of channels of inner support is 4 roads, and the support component quantity of per pass inner support is 2, and the number of channels of inner support and the support component quantity and spacing of per pass inner support can be arranged according to the practical situation of excavation models test.
As shown in Figure 4, giving the present invention application in excavation of foundation pit model test, soil test model casing 8 and reaction frame 10 are each attached on model casing base 9. Needs according to actual excavation of foundation pit test model, the quantity of the fixing bolt 4 of the inner support on adjustable retaining wall 5 and position, install corresponding support component, it is achieved the simulation of excavation of foundation pit and propping operation.
Based on above-mentioned assay device, the test method that in a kind of Simulation of Excavation Process provided by the invention, inner support is installed, the method is specific as follows:
After retaining wall 5 is installed the fixing bolt 4 of inner support and soil pressure cell, retaining wall 5 is placed in soil test model casing 8; Filling test soil sample 11 in model casing 8, at test installation position, soil sample 11 surface displacement sensor; Ground floor excavation the soil body be ground surface to first inner support, the second layer excavation soil body be bottom first inner support to second inner support, by that analogy, define each excavation soil layer.
The soil body in the vertical hole successively excavating retaining wall 5 side, carries out soil pressure in whole Excavation Process, cheats the continuous collecting of the sedimentation of the outer soil body, hole end uplift of soil and retaining wall displacement data.After completing ground floor soil excavation, the inner thread mouth 2-2 of solid aluminum bar 2 is threadeded with the fixing bolt 4 of the inner support on retaining wall 5, adjustable telescopic rod 1 is so as to hold out against reaction frame 10, and tight a bolt 3 guarantee expansion links 1 and solid aluminum bar 2 compact siro spinning technology, completes first inner support and installs. The stage excavation second layer soil body, adopts method as previously mentioned to install second inner support, and so forth until excavation of foundation pit completes. The experimental data that under the excavating conditions at different levels of ultimate analysis data collecting instrument acquisition and recording, soil pressure cell and displacement transducer obtain.

Claims (5)

1. the assay device that in a Simulation of Excavation Process, inner support is installed, it is characterised in that this device includes the inner support that some roads are installed on retaining wall (5), and per pass inner support is made up of some inner support unit being positioned at same level height; Described inner support unit includes expansion link (1), solid aluminum bar (2) and bolt (3); Described expansion link (1) is hollow aluminum pipe, and expansion link (1) has some screwed holes (1-1); Having some grooves (2-1) on described solid aluminum bar (2), one end has inner thread mouth (2-2); Described bolt (3) props up the groove (2-1) of solid aluminum bar (2) through the screwed hole (11) on expansion link (1) so that expansion link (1) and solid aluminum bar (2) compact siro spinning technology; Described retaining wall has some screwed holes on (5), inner thread mouth (2-2) on solid aluminum bar (2) is threadeded with the fixing bolt (4) of inner support through retaining wall (5) screwed hole, so that inner support unit is fixed on retaining wall (5).
2. the assay device that in a kind of Simulation of Excavation Process according to claim 1, inner support is installed, it is characterised in that: the quantity and spacing of the groove (2-1) on described solid aluminum bar (2) is configured according to the requirement of model test inner support length.
3. the assay device that in a kind of Simulation of Excavation Process according to claim 1, inner support is installed, it is characterised in that: the quantity and spacing of described bolt (3) and the upper corresponding screwed hole (1-1) of expansion link (1) is adjusted according to inner support stress size.
4. the assay device that in a kind of Simulation of Excavation Process according to claim 1, inner support is installed, it is characterised in that: the practical situation that the number of channels of described inner support and the support unit quantity and spacing of per pass inner support are tested according to excavation models is arranged.
5. the test method that in a Simulation of Excavation Process, inner support is installed, it is characterised in that the method is specific as follows:
After retaining wall (5) the fixing bolt (4) of upper installation inner support and soil pressure cell, retaining wall (5) is placed in soil test model casing (8); Filling test soil sample (1-1) in model casing (8), at test soil sample (1-1) installation position, surface displacement sensor; Ground floor excavation the soil body be ground surface to first inner support, the second layer excavation soil body be bottom first inner support to second inner support, by that analogy, define each excavation soil layer.
The soil body in the vertical hole successively excavating retaining wall (5) side, carries out soil pressure in whole Excavation Process, cheats the continuous collecting of the sedimentation of the outer soil body, hole end uplift of soil and retaining wall displacement data. After completing ground floor soil excavation, fixing to the inner thread mouth (2-2) of solid aluminum bar (2) and the inner support on retaining wall (5) bolt (4) is threadeded, adjustable telescopic rod (1) is so as to hold out against reaction frame (10), tight a bolt (3) guarantee expansion link (1) and solid aluminum bar (2) compact siro spinning technology, completes first inner support and installs.The stage excavation second layer soil body, adopts method as previously mentioned to install second inner support, and so forth until excavation of foundation pit completes.
CN201610207386.2A 2016-04-01 2016-04-01 Test device and method for simulating installation of inner support in process of pit excavation CN105672380A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100743938B1 (en) * 2006-03-30 2007-08-01 (주)한국해외기술공사 Field tri axial test system
CN101644057A (en) * 2009-08-11 2010-02-10 武汉市政工程设计研究院有限责任公司 Adjustable umbrella-shaped inside support device for foundation ditch supporting construction
CN201730338U (en) * 2010-08-11 2011-02-02 孔伟兵 Strut for supporting polyphenyl foam formwork walls
CN102839675A (en) * 2012-09-25 2012-12-26 上海新强劲工程技术有限公司 Long-span pre-stress fish belly sill for foundation pit support and mounting method thereof
CN203701157U (en) * 2013-11-29 2014-07-09 西南交通大学 Inner support clamp of simple geotechnical centrifuge for simulating pit excavation experiment
CN205712216U (en) * 2016-04-01 2016-11-23 浙江大学 The assay device that in a kind of Simulation of Excavation Process, inner support is installed

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100743938B1 (en) * 2006-03-30 2007-08-01 (주)한국해외기술공사 Field tri axial test system
CN101644057A (en) * 2009-08-11 2010-02-10 武汉市政工程设计研究院有限责任公司 Adjustable umbrella-shaped inside support device for foundation ditch supporting construction
CN201730338U (en) * 2010-08-11 2011-02-02 孔伟兵 Strut for supporting polyphenyl foam formwork walls
CN102839675A (en) * 2012-09-25 2012-12-26 上海新强劲工程技术有限公司 Long-span pre-stress fish belly sill for foundation pit support and mounting method thereof
CN203701157U (en) * 2013-11-29 2014-07-09 西南交通大学 Inner support clamp of simple geotechnical centrifuge for simulating pit excavation experiment
CN205712216U (en) * 2016-04-01 2016-11-23 浙江大学 The assay device that in a kind of Simulation of Excavation Process, inner support is installed

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Application publication date: 20160615

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