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Push-down settlement united test method and test device of foundation and road bed

A test device and foundation technology, applied in the field of transportation, can solve problems such as expensive test devices, affecting roadbed construction, embankment compaction dead ends, etc.

Inactive Publication Date: 2009-12-30
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Some existing roadbed settlement test devices, such as settlement plates and settlement magnetic rings, often affect the construction of the roadbed, resulting in embankment compaction dead ends, and some embedded test devices are often expensive

Method used

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  • Push-down settlement united test method and test device of foundation and road bed
  • Push-down settlement united test method and test device of foundation and road bed

Examples

Experimental program
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Effect test

Embodiment

[0037] Embodiment: In the subgrade construction of the Binzhou-Dezhou expressway, the method proposed by the present invention was adopted experimentally for the settlement observation of the powder-sprayed pile composite foundation and subgrade.

[0038] The foundation treatment technology of powder spraying piles was used in the construction of the high fill subgrade of Binde Road No. 2 Contract. The height of the subgrade (including the thickness of the pavement structure) is 7m, and the length of the powder spraying piles is 12m. In order to observe the subgrade and foundation settlement, settlement observation devices are buried every 50m on the symmetrical plane of the road, such as figure 1 shown. The depth of the layered settlement test hole of the powder-jet pile composite foundation is 12m, and the bottom of the hole is just located on the surface of the underlying layer of the composite foundation. Subgrade, ground and subsurface subsidence observations are the mai...

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Abstract

The invention relates to a push-down settlement united test method of a foundation and a road bed, which comprises the following steps: a. punching a test hole on the foundation, wherein the depth of the test hole is the foundation settlement test range; b. distributing a traditional layering settlement gauge in the test hole, leveling the surface of the foundation after finishing the laying; arranging a hidden settlement test device; laying one hidden settlement test device every 1-2m following the increment of the filling height; c. starting the test of the settlement of the foundation and the road bed when the road bed is started to fill, measuring the absolute settlement of the surface of the road bed and the foundation by using the hidden settlement test devices, measuring the relative settlement of the hole bottom and the ground by the layering settlement gauge; setting the relative settlement of the hole bottom and the ground to be Delta s and the absolute settlement of the ground to be s0 as well as the absolute settlement s of the hole bottom to be s, wherein s is equal to s0-Delta s. The invention also discloses a hidden settlement test device. The invention tests the settlement of the road bed without influencing the road bed construction, and the absolute settlement test of any point in the foundation only needs punching within the test range.

Description

technical field [0001] The invention relates to a transportation technology, in particular to a push-down combined test method and test device for foundation and subgrade settlement. Background technique [0002] Some existing subgrade settlement test devices, such as settlement plates and subsidence magnetic rings, often affect the construction of the subgrade, resulting in embankment compaction dead ends, and some embedded test devices are often expensive. At present, layered settlement meters are mostly used to test the settlement of a certain point in the foundation. However, in order to test the absolute settlement, the lower end of the layered settlement meter must be located outside the affected area of ​​the roadbed. It is necessary to drill a deep hole to install the settlement meter to ensure that the lower end is absolutely The settlement is about 0. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/02E01C3/00
Inventor 崔新壮金青车华桥高发亮
Owner SHANDONG UNIV
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