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Experimental device for simulating excavation of foundation pit

An experimental device and foundation pit technology, which is applied in the testing of basic structures, basic structure engineering, construction, etc., can solve the problems of trouble, large errors, time-consuming and laborious, and achieve the effects of easy observation, high feasibility and simple operation.

Inactive Publication Date: 2019-06-14
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to ensure the safety and stability of the foundation pit and surrounding buildings, some scholars have done a large number of foundation pit excavation simulation experiments, but the experimental devices have many deficiencies. Sand, at present, scholars do experiments by placing colored sand little by little against the wall of the model box by hand, which is cumbersome and time-consuming. It is difficult to ensure that the colored sand is arranged close to the inner wall of the model box, and it cannot be guaranteed that the colored sand is arranged horizontally
In addition, when the sand rain method is used to prepare the foundation material, the sand is poured out by people holding the sand bucket and shaking it from side to side. , resulting in large error

Method used

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  • Experimental device for simulating excavation of foundation pit
  • Experimental device for simulating excavation of foundation pit
  • Experimental device for simulating excavation of foundation pit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1 simulated foundation pit excavation experimental device

[0065] Experimental device for simulating foundation pit excavation, such as figure 1 As shown, it includes a model box 1, a colored sand layout instrument 2, and a sand rain method sand distribution device 3. The sand rain method sand distribution device 3 is arranged above the model box 1 and is used for sand or sand distribution. The soil is evenly laid in the model box, and the colored sand layout instrument is arranged on the upper side of the model box 1, and is used for horizontally arranging the colored sand close to the inner wall of the model box. Wherein, the model box is a rectangular box exposed above, and the inner wall of the model box is pasted with a polyethylene film, and scales are marked on the two side walls outside the model box. The colored sand layout instrument includes an hourglass, a first connecting rod, a second connecting rod, a third connecting rod, a collar, a first buc...

Embodiment 2

[0068] Present embodiment is on the basis of embodiment 1, concretely sets up the experimental device of simulating foundation pit excavation, and wherein, model box is the rectangular box that is exposed above the city surrounded by plexiglass, and box thickness is 10mm, and box size is 1 1 × l 1 × l 1 , plexiglass has good transparency, in order to reduce the friction between the sand and the inner side wall of the model box, a 0.04mm polyethylene film is pasted around the inside of the model box, and the scale h is marked on the side walls of the model box 1 , h 2 , h 3 ..., the excavated soil thickness h differs between each scale, and the size of the model box is calculated by the experimenter according to the site conditions. In addition, four decks are respectively set at the four vertices above the model box, and bolt holes are provided on the decks for placing sand rain method sanders.

[0069] Colored sand layout instrument such as figure 2 As shown, the hourgl...

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Abstract

The invention relates to an experimental device for simulating excavation of a foundation pit. The experimental device for simulating the excavation of the foundation pit includes a model box, a colorsand arrangement apparatus and a sand pouring method sand distributor, wherein the sand pouring method sand distributor is arranged on the upper part of the model box and used for uniformly laying sand or sandy soil into the model box, and the color sand arrangement apparatus is arranged on one side of the upper part of the model box and used for tightly attaching color sand to the inner wall ofthe model box for horizontal arrangement; and a funnel capable of being adjusted up and down and left and right is installed on the side wall of the upper part of the model box, and the funnel is connected with a clamping buckle through a connecting rod. According to the experimental device for simulating the excavation of the foundation pit, the clamping buckle can slide on a clamping groove of aclamping plate fixed to the side wall of the upper part of the model box, so it is ensured that the color sand can be horizontally arranged and can be tightly attached to the inner wall of the modelbox, and the observation is convenient; and the sand pouring method sand distributor is designed, it is ensured that the sandy soil can be evenly scattered, and the speed of sand paving can be furthercontrolled.

Description

technical field [0001] The invention relates to an experimental device for simulating foundation pit excavation, and belongs to the technical field of foundation pit engineering and the field of geotechnical testing. Background technique [0002] In recent years, with the acceleration of the urbanization process, the scale of development and utilization of urban underground space has expanded rapidly, and the number and scale of underground engineering projects have increased significantly. Traffic ramp foundation pit, etc. Foundation pit excavation is a dynamic excavation process in a semi-infinite space. Excavation and unloading of the foundation pit will cause lateral displacement of the soil around the foundation pit, and rebound at the bottom of the pit. These unloading behaviors of the soil will affect the safety of the foundation of the surrounding buildings. Therefore, the excavation of the foundation pit is not only a traditional To ensure the safety and stability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
Inventor 赵文路博柏谦陈阳金陈王鑫
Owner NORTHEASTERN UNIV
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