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Density Measuring Device and Method for Measuring Filling Density of Rock Fill Subgrade Using the Device

A technology of rockfill subgrade filler and measuring device, which is applied in the direction of measuring device, specific gravity measurement, and analysis materials, etc., can solve the problems of large particle size rockfill embankment operation is difficult, the stability of the pit wall is difficult to ensure, and the volume of filler is difficult, etc. To achieve the effect of long service life, easy inspection, and streamlined overall structure

Active Publication Date: 2019-07-23
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for measuring the density of subgrade on site mainly include: (1) ring knife method: a destructive measurement method, the advantages are: simple equipment, easy to use; the disadvantage is: the stress generated when the ring knife is driven into the soil makes the soil Loose, and the stress generated when the wall is thick is relatively large; it is mainly used to measure the density of cohesive soil without aggregate, and it is not suitable for the measurement of large-size rock-filled roadbeds (difficult to operate); (2) Sand filling method: A destructive measurement method, which is suitable for the density determination of fine-grained soil and medium-grained soil; (3) Irrigation method: firstly, the plastic film is laid along the inner wall of the ring sleeve and the ground surface, and its volume and weighing are measured after injecting water. Take the mass of the filler in the excavation pit and calculate its density. This method is mainly suitable for measuring the density of coarse-grained soil and giant-grained soil on site, and it needs to excavate to destroy the original subgrade structure. It is difficult to guarantee the stability of the pit wall after digging the pit to take the filler , it is more difficult to obtain the volume of the filler in the follow-up measurement

Method used

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  • Density Measuring Device and Method for Measuring Filling Density of Rock Fill Subgrade Using the Device
  • Density Measuring Device and Method for Measuring Filling Density of Rock Fill Subgrade Using the Device
  • Density Measuring Device and Method for Measuring Filling Density of Rock Fill Subgrade Using the Device

Examples

Experimental program
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Effect test

Embodiment 1

[0050] see figure 1 as well as figure 2 , a density measuring device, comprising a box body 1 with no upper cover and a cubic structure, a plurality of earth pressure cells 2 arranged on the bottom inner wall of the box body 1, arranged outside the box body 1 and connected with all the The tester 3 connected to the earth pressure cell 2 and used to read all the data of the earth pressure cell 2 and the weighing part separately provided for weighing, the weighing part generally adopts a weighbridge.

[0051] The box 1 is a cube structure (the box can also be designed as a cuboid structure according to actual conditions), its length and width are 200cm, and its height is 100cm; the quantity of the earth pressure box 2 is 5, four The earth pressure cells 2 are evenly distributed around it with one earth pressure cell 2 as the center of a circle (the minimum vertical distance from the four earth pressure cells to the box side wall is 50 cm), and the earth pressure cells at the c...

Embodiment 2

[0088] The same density measuring device as in Example 1 was used to measure the density of rockfill subgrade filler in another section (marked as P2) in the mountainous area of ​​Guizhou. The measurement steps were the same as in Example 1. The measurement data and calculation results are shown in Table 4 and Table 5 respectively.

[0089] Table 4 Field test data and calculation results of P2 section

[0090]

[0091]

[0092] Table 5 Changes of field static earth pressure at P2 section

[0093]

[0094] According to the relevant data in Table 4 and Table 5, the relationship curve between the number of rolling passes and the density of the filler for the roadbed and the relationship between the density of the filler for the roadbed and the static earth pressure value are drawn. See the specific drawings for details Figure 8 and Figure 9 .

[0095] Known by embodiment 1 and embodiment 2 ( Figure 6 and Figure 8 Compare, Figure 7 and Figure 9 For comparison), ...

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Abstract

The invention firstly aims to provide density measuring equipment, comprising a box body, a plurality of earth pressure cells, a tester and a weighing part, wherein the box body is not provided with an upper cover and is of a cube structure, the plurality of earth pressure cells are arranged at the inner wall of the bottom of the box body, the tester is arranged outside the box body and connected with all the earth pressure cells and is used for reading data from all the earth pressure cells, and the weighing part is arranged separately and is used for weighing. By using the density measuring equipment provided by the invention, the following effects are achieved: a, the whole structure is simplified; b, measurement precision is high; c, the density measuring equipment is suitable for a rockfill material of which the particle size is smaller than 50cm, can meet the real demand and has strong practicality. The invention secondly aims to provide a method for measuring density of rockfill subgrade filler by adopting the density measuring equipment, measurement procedures are simplified, damage on a subgrade does not occur in a measuring process, the accuracy of measurement is high and the practicability is strong.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a density measuring device and a method for using the device to measure the density of rock-filled subgrade filler. Background technique [0002] In the prior art, the roadbed is mostly made of stone filling. Most of the existing rock filling materials come from stones mined by blasting or other waste rock materials. This type of rock filling materials has the characteristics of large particle size, high shear strength, strong water permeability, and large void ratio. The compaction principle of the stone filling is: after the paving is completed, the interior of the stone filling is relatively loose; the internal stress state of the stone filling changes under the external force, which leads to the breaking of the initial stress balance state inside the stone filling, and the stone in the stone filling The particles overcome the inter-particle friction and move to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N9/02G01N9/36
CPCG01N9/02G01N9/36G01N2009/024
Inventor 乔世范母进伟孔余江孙晓卢道勇陈耘舒胡明刘政何忠舟赵孝学石磊余长益杨宏
Owner CENT SOUTH UNIV