Testing method for fine-grained soil compaction degree

A measuring method and technology of compaction degree, which can be used in the field of basic soil survey, soil material testing, material inspection and other directions. It can solve the problems of long cycle and complicated operation, and achieve the effect of less equipment, simple process and time saving.

Inactive Publication Date: 2017-12-29
SINOHYDRO BUREAU 11 CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to re-establish the relationship between the penetration hammer number and the d

Method used

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  • Testing method for fine-grained soil compaction degree
  • Testing method for fine-grained soil compaction degree
  • Testing method for fine-grained soil compaction degree

Examples

Experimental program
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Embodiment 1

[0037] Step 1: Select the target backfill soil sample, and make the selected soil sample into 6 groups of soil samples with different moisture content for indoor compaction test, obtain different moisture content, corresponding dry density value and maximum dry density value, and record Table 1 below:

[0038] Step 2: Use a portable concrete setting time tester to detect the penetration resistance values ​​of the soil samples prepared in Step 1 with different moisture contents and hammering numbers, and record them in Table 1 as follows:

[0039] Table 1

[0040]

[0041]

[0042]

[0043] Note: In order to ensure the accuracy of data fitting, the number of points taken for dry density and penetration resistance corresponding to different hammering numbers was increased in this example.

[0044] Step 3: Perform logarithmic regression analysis and linear regression analysis on the moisture content and dry density recorded in Step 1 (Table 1) and the penetration resist...

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Abstract

The invention relates to a testing method for the fine-grained soil compaction degree. The testing method comprises the following steps that a target backfill soil sample is selected, the selected soil sample is manufactured into five to nine sets of soil samples different in water content, the indoor moisture-density test is conducted, and the different water contents, the corresponding dry density value and the maximum dry density value are obtained; the penetration resistance values of the soil sample under different water contents and different blow counts in the first step are tested; the regression analysis is conducted on the recorded water contents, dry density value and penetration resistance values, and a regression relational expression is obtained; one test face is selected in the filling site, the quick penetration test is conducted 5-9 times, and the penetration resistance value every time is recorded; digging is conducted to the bottom of the test face in the fourth step, and the water content of the dug-out soil is tested; the relational expression in the third step is selected according to the water content value detected in the fifth step; and the average value of the penetration resistance recorded in the fourth step is calculated and then substituted into the relational expression selected in the sixth step, the dry density is calculated, and accordingly the compaction degree of fine-grained soil in the filling site is calculated.

Description

technical field [0001] The invention belongs to the technical field of fine-grained soil compaction detection, and in particular relates to a method for measuring the compactness of fine-grained soil. Background technique [0002] At present, the quality of earthwork backfill in the inspection project is mainly judged by the degree of compaction, and there are four main methods for detecting the degree of compaction: ring knife method, sand filling method, water filling method and nuclear density meter method. Among them, the first three detection methods require relatively sophisticated balances and drying equipment or burning materials to complete during the detection process, and none of them can obtain the detection results immediately on site, so they have a certain impact on the construction progress of earthworks; and Although the nuclear density meter can immediately detect the density of the unearthed soil, the nuclear density meter has a certain degree of radiation...

Claims

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Application Information

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IPC IPC(8): E02D1/02G01N33/24
CPCE02D1/02E02D1/025E02D1/027G01N33/24
Inventor 王正峡罗伟毛俊波巩宁峰刘延铎常伟良赵莹邓兆勋张旭东
Owner SINOHYDRO BUREAU 11 CO LTD
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