Method of evaluating relative compaction of calcium soil on the basis of light dynamic penetration index

A technology of relative compactness and dynamic penetration testing, which is applied in soil material testing, material inspection products, measuring devices, etc., can solve problems such as the reduction of calculation accuracy, and achieve the effects of simple and clear methods, strong reliability, and reduced manpower

Inactive Publication Date: 2019-01-29
TIANJIN UNIV
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  • Claims
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Problems solved by technology

In addition, most of the existing empirical formulas do not consider the influence of soil particle size and gradation, resulting in a decrease in calculation accuracy. Especially f...

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  • Method of evaluating relative compaction of calcium soil on the basis of light dynamic penetration index
  • Method of evaluating relative compaction of calcium soil on the basis of light dynamic penetration index
  • Method of evaluating relative compaction of calcium soil on the basis of light dynamic penetration index

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Embodiment 1

[0041] The method for evaluating the relative compactness of calcareous soil based on light dynamic penetrating test index of the present invention may further comprise the steps:

[0042] Step 1: Dry the two types of calcareous soil samples retrieved from the site, one is calcareous gravel and the other is calcareous coarse sand. The results obtained through the geotechnical test are: calcareous gravel, its maximum dry density ρ d,max =1660kg / m 3 , the minimum dry density ρ d,min =1273kg / m 3 , average particle size d 50 =2.7mm, non-uniformity coefficient C u =6.25; calcareous coarse sand, its maximum dry density ρ d,max =1567kg / m 3 , the minimum dry density ρ d,min =1250kg / m 3 , average particle size d 50 =0.9mm, non-uniformity coefficient C u = 3.33.

[0043] Step 2, set nine relative compactness D for each type of calcareous soil sample ri , according to the maximum dry density ρ measured in step 1 d,max , minimum dry density ρ d,min , using the formula (1) to...

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Abstract

The invention discloses a method of evaluating relative compaction of calcium soil on the basis of a light dynamic penetration index. The method includes: A) drying a site-collected calcium soil sample and performing a geo-technical test to determine the [rho]<d, max>, [rho]<d, min>, d<50> and C of each calcium soil sample; B) setting Dri and calculating the [rho]di of each calcium soil sampleunder every Dri; C) calculating the penetrating hammer striking time of each calcium soil sample and the accumulated penetrating depth of a probe after each hammer striking time under different [rho]di; D) respectively drawing hammer striking time-accumulated penetrating depth scatter diagrams of each calcium soil sample, and fitting data points in each group into a straight line in every diagram,wherein the slope of each straight line is the p<index, i> of the corresponding calcium soil sample under the Dri; E) acquiring the [p<index, i>SQRT(d<50>C), Dri] data points and drawing scatter diagrams; F) performing fitting to obtain an expression formula of p<index, i>SQRT(d<50>C) and Dri; G) acquiring an expression formula of relationship between 300[SQRT(d<50>C)]/N10 and the Dri. By means of the method, the predicted relative compaction of a calcium soil subgrade is coincided with practical situations better.

Description

technical field [0001] The invention relates to a method for evaluating the relative compactness of calcareous soil, more specifically, relates to a method for evaluating the relative compactness of calcareous soil based on light dynamic penetration test index. Background technique [0002] Calcareous soils are widely distributed along the continental shelf and coastline of the region. Due to the unique physical and mechanical properties of calcareous soil, its engineering characteristics are quite different from continental sediments. Therefore, proposing a new method that can quickly and accurately predict the compactness of calcareous soils is very important for the design and construction of roads and airports on these islands. [0003] For non-cohesive soils such as calcareous gravel and calcareous sand, the relative compactness D r It is the main index to evaluate the degree of compaction. D. r The calculation formula of is as formula (1): [0004] [0005] Amo...

Claims

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Application Information

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IPC IPC(8): G01N33/24G01N9/00
CPCG01N9/00G01N33/24
Inventor 李飒林澜刘小龙俞俊
Owner TIANJIN UNIV
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