Model test device and method for foundation pit supporting system

A model test device and foundation pit support technology, which is applied in the testing of foundation structures, foundation structure engineering, construction, etc., can solve problems such as being unsuitable for studying foundation pit support conditions, and achieve low density, high recovery rate, and improved Effects of Test Efficiency

Pending Publication Date: 2019-03-15
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most foundation pit models use dry sand, without considering the influence of groundwater, and mainly study the changes in soil pressure and support deformation during foundation pit excavation, which are not suitable for studying foundation pit support under the influence of groundwater and temperature

Method used

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  • Model test device and method for foundation pit supporting system
  • Model test device and method for foundation pit supporting system
  • Model test device and method for foundation pit supporting system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] see figure 1 and figure 2 , a model test device for foundation pit support system under freeze-thaw cycle conditions in seasonally frozen regions according to an embodiment of the present invention, comprising a base 1, a model box 2, and a model plate 3, a rigid baffle 4, The front opening and closing rigid baffle 5 , the right opening and closing rigid baffle 6 , tempered glass plate 7 , pole 8 , hoisting system 9 , water supply device 10 and cooling system 11 .

[0045] The base 1 is welded by steel plates and angle steels. The angle steels are connected to each other and form grids. There are spaces between the grids so that the grids are connected to each other. The longitudinal dimension of the base is slightly larger than the bottom of the model box. There are protruding baffles that can hold the model box to prevent the model box from moving during the test. The side steel plate of the base is higher than the bottom of the box, the base can be filled with wat...

Embodiment 2

[0065] The difference between this embodiment and embodiment 1 is that the configured soil with a certain moisture content is filled into the left model box when filling the soil, and no support is applied when filling the soil on the right. Then excavate the left fill soil to the first support position, apply the first support, read; then excavate the left fill soil to the second support position, apply the second support, read; then excavate the left fill When the third support position is reached, the third support is applied and the reading is taken; finally excavated to the bottom of the pit and the reading is taken. Other processes are the same as in Example 1.

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Abstract

The invention discloses a model test device and method for a foundation pit supporting system. The model test device comprises a base, a model box, a model plate, a water supply device, a cooling system, a temperature sensor and a data acquisition instrument. A water storage tank is arranged on the base. The model box is arranged on the base. A bottom plate of the model box is located in the waterstorage tank of the base. A plurality of water seepage through holes are formed in the bottom plate. The model plate is fixedly arranged inside the model box. A plurality of displacement sensors andpressure sensors are fixedly arranged on the model plate. The water supply device comprises a water supply tank and a water supply pipe. The water supply can be provided to the model box through the water supply tank and the water supply pipe. The temperature of the model box can be reduced by the cooling system. By means of the model test device and method for the foundation pit supporting system, an indoor model test of a foundation pit can be carried out, and the effects of supporting construction, groundwater and temperature can be considered in the simulation test.

Description

technical field [0001] The invention belongs to the technical field of model tests of foundation pit support systems, in particular to a model test device and method for foundation pit support systems. Background technique [0002] In recent years, with the rapid development of social population concentration and urbanization, urban construction has also developed rapidly, and the number of deep foundation pit projects is increasing, which is facing challenges such as large scale, difficult construction and complex surrounding environment. When the foundation pit is built in a water-rich area where the temperature changes greatly with the seasons every year, the groundwater will cause frost heaving and thawing of the soil around the foundation pit under the influence of temperature, and the safety of the enclosure during foundation pit construction has been highly concerned. The method of indoor geotechnical model test is used to simulate the force and deformation of the sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 杨晓华赵鑫何少华肖靖郑坤隆邵莹曾浩
Owner CHANGAN UNIV
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