Soil and stone mixed filling roadbed compaction degree detecting method

Abstract

The invention discloses a soil and stone mixed filling roadbed compaction degree detecting method, which comprises the steps of: randomly selecting a soil and stone mixed filling roadbed test site, and obtaining the site compaction degree by a single-point douche or a sand cone method; carrying out fast static test in a preset position near the test site and obtaining a curve between the penetration power P and the penetration depth w; calculating the average density Rhom of the soil and stone mixed filling roadbed and calculating the initial void ratio n0 in the preset position; carrying out linear fitting according to the curve between the penetration power P and the penetration depth w and obtaining the value of the initial intermediate quantity a0 and b0; calculating the void-free deformation modulus E0 of stone particles of the soil and stone mixed filling roadbed; and calculating the compaction degree of other positions, i.e. the compaction degree in the ordinary positions. The method can be used for fast, stably and accurately detecting the compaction degree of the soil and stone mixed filling roadbed and is suitable for any compaction process and roadbeds compacted by compaction machinery.

Description

[technical field] [0001] The invention relates to the field of testing the degree of compaction of roads, in particular to a method for detecting the degree of compaction of soil-rock mixed-fill subgrades. [Background technique] [0002] With the extension of highway construction to mountainous areas, earth-rock mixed filling roads have the advantages of being able to use local materials, small post-construction settlement, and good economy, and have become a more common road subgrade type. In order to ensure the quality of earth-rock mixed subgrade filling, the control of compaction is one of the keys. At present, the commonly used detection methods for roadbed compactness can be roughly divided into three categories: water injection (sand) method, wave method and static penetration method. Although these methods have been widely used in general roadbed compaction detection, they will There are many limitations and deficiencies in their application to earth-rock mixed subg...

AI Technical Summary

Problems solved by technology

First of all, although the water (sand) method is the most accurate way to test the degree of subgrade compaction, a test pit must be excavated, and the subgrade will be damaged to a certain extent. For soil-rock mixed subgrades, excavation is difficult, so this method should be used for large-scale detection The degree of subgrade compaction and low efficiency cannot meet the requirements of rapid construction of engineering mechanization. Although the detection efficiency of this type of method is high, its accuracy is not enough to meet the engineering requirements; third, the static penetration method uses statistical principles to compare the degree of compaction with the penetration load, coarse particle content, maximum particle size and moisture content. To establish a statistical relationship between them, it is necessary to conduct a large number of large-scale compaction tests indoors in advance. For different soil-rock mixed subgrades, it is more complicated to determine the degree of subgrade compaction indirectly by establishing an empirical relationship. Even if this relationship is established Often do not have universal adaptability, therefore, it is difficult to use this method to detect the accuracy of soil-rock mixed subgrade compaction to meet engineering requirements

Images