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Vacuum preloading and piling preloading combined settling column tester and test method thereof

A technology of stacking preloading and settling columns, which is applied in the directions of instruments, measuring devices, surveying and mapping and navigation, etc., to achieve the effect of simple structure, reduced errors and easy to use

Active Publication Date: 2017-12-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no settling column tester that comprehensively uses the measurement of pore pressure distribution and the combination of vacuum preloading and heap preloading.

Method used

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  • Vacuum preloading and piling preloading combined settling column tester and test method thereof
  • Vacuum preloading and piling preloading combined settling column tester and test method thereof
  • Vacuum preloading and piling preloading combined settling column tester and test method thereof

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specific Embodiment

[0051] Below in conjunction with the example, the method for improving the settlement column test of dredging fill is described in detail. For the convenience of explanation, the schematic diagram showing the structure of the device will not be partially enlarged according to the general scale, and should not be used as a limitation of the present invention. In addition, in actual production In , the three-dimensional space dimensions of length, width and height should be included.

[0052] The settling column 6 is a cylindrical glass container with an open top and a closed bottom, with an inner diameter of 60 cm and a side wall thickness of 1 cm; 16 holes are arranged on four radii at intervals of 30° at the bottom of the settling column 6, and the side walls are provided with 4 rows of each There are 4 rows of 4×4=16 hole slots in total, wherein the height spacing of each row of hole slots is 12.5 cm, and these hole slots are used for installing hole pressure sensors 8 . In ...

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Abstract

The invention relates to the field of foundation treatment researches, and aims at providing a vacuum preloading and piling preloading combined settling column tester and a test method thereof. A partition steel plate is arranged in a settling column, and is connected with a displacement sensor through a hollow rigid sleeve, a water drainage plate is sleeved in the rigid sleeve, and the lower part of the water drainage plate is landfilled in a soil sample. The top of the settling column is provided with a cover plate, and a water bag is arranged in a space between the cover plate and the partition steel plate; the sidewall of the settling column and the rigid sleeve are respectively provided with vacuum tubes, and the vacuum tubes are connected to a vacuum pump; the bottom and the sidewall of the settling column are provided with a plurality of pore pressure sensors; and the pore pressure sensors and the displacement sensor are connected to a data acquisition system through signal lines. The tester and the test method have the advantages of simple structure, easiness in use, simplicity and convenience in changing of the piling load value through hydraulic control, effectiveness in obtaining the change of the pore pressure in different radial positions during consolidation, automatic data recording, reduction of manpower needed by experiments, reduction of errors caused by manpower reading, and realization of repeated sue and no wastes or pollution of a model materials and filled soil.

Description

technical field [0001] The invention relates to the field of foundation treatment research, in particular to a settling column tester and a test method combining vacuum preloading and heap preloading. Background technique [0002] With the rapid development of my country's economy and society, the urbanization process and construction projects are also constantly advancing. A large number of large buildings and structures such as expressways, high-speed railways, high-rise buildings, and airports have been built in developed coastal areas such as the Yangtze River Delta and the Pearl River Delta. Due to geographical and historical reasons, these areas are mostly distributed with deep and thick soft clay with high natural water content, large natural void ratio, high compressibility, and low permeability. Such soil layers have natural disadvantages when used as foundations. Due to its low strength, the bearing capacity and stability of the foundation are often insufficient, w...

Claims

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Application Information

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IPC IPC(8): G01C5/00G01N19/00
CPCG01C5/00G01N19/00
Inventor 孙宏磊刘斯杰蔡袁强
Owner ZHEJIANG UNIV
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