Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for testing and evaluating swelling and shrinkage characteristics of expansive soil based on three-dimensional scanning

A technology of characteristic testing and three-dimensional scanning, which is applied in the field of geotechnical engineering, can solve the problems that the control measurement of expansive soil cannot be realized, the overall properties of the soil are not considered, and the shape of expansive soil cannot be obtained by measurement methods, so as to achieve better test and evaluation results. It has the effects of reliability, fast scanning speed and avoiding secondary interference

Pending Publication Date: 2022-07-01
BAOSHAN UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for testing and evaluating the expansion and contraction characteristics of expansive soil based on three-dimensional scanning, which is used to solve the problems in the prior art: traditional measurement methods cannot obtain the shape of expansive soil after deformation, and cannot realize the measurement of expansive soil. Controlled measurement of deformation at each stage, and this method mainly focuses on the granular material properties of the expansive soil itself, without considering the overall properties of the soil

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for testing and evaluating swelling and shrinkage characteristics of expansive soil based on three-dimensional scanning
  • Method for testing and evaluating swelling and shrinkage characteristics of expansive soil based on three-dimensional scanning
  • Method for testing and evaluating swelling and shrinkage characteristics of expansive soil based on three-dimensional scanning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] This embodiment is a three-dimensional scanning-based test for positive expansion characteristics of expansive soil and its evaluation method. The scanning and parameter acquisition processes are as follows: figure 1 shown, including the following steps:

[0064] S1. Make the standard sample of expansive soil as a cuboid, specifically a small cuboid of 40mm×40mm×160mm.

[0065] S2. Scan the formed cuboid specimen. Unconfined expansive soil specimens were used as scanning objects. For the unconfined expansive soil specimen, the surface scan (except the bottom surface) is mainly performed to obtain the surface point cloud data of its expansion in space.

[0066] When scanning, first place the newly formed expansive soil sample lightly on the horizontal platform, and stick markers around the platform for position identification and positioning; secondly, a handheld high-precision three-dimensional laser scanner is used to detect the external The surface is scanned in al...

Embodiment 2

[0080] This example is the same as Example 1, except that the test scheme is the reverse shrinkage characteristic test of expansive soil and its evaluation method.

[0081] Other operation procedures and specific technical solutions are the same as those in Example 1, and the calculation formulas for each index are the same as those in (1) to (6) in Example 1.

[0082] in, β(t) and θ(t) are the correlation functions of the shrinkage coefficient of the sample changing with time t. Here, the dependent variable time t can be changed to other test conditions (such as initial moisture content, dry density, etc.) according to the test content.

[0083] In Example 1, the formulas (1) to (6) were all changed to the calculation formulas of the relevant indexes in the reverse shrinkage test of the sample. That is, first measure the sample in the saturated state or in a certain expansion state for test measurement, and then measure the shrinkage of the sample with the change of time or...

Embodiment 3

[0085] This example is the same as Example 1, except that the tested expansive soil sample is a standard cube specimen, specifically a small cube of 40mm×40mm×40mm.

[0086] Other operating procedures and specific technical solutions are the same as in Example 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of geotechnical engineering, in particular to a three-dimensional scanning-based expansive soil expansion and shrinkage characteristic testing and evaluating method. Comprising the following steps: manufacturing an expansive soil test sample; scanning the expansive soil test sample; obtaining a point cloud data set An; carrying out model reconstruction to obtain a space measurable model of the expansive soil test sample under different conditions and time, and carrying out geometric parameter measurement; and establishing an expansion-shrinkage index system of the expansive soil. According to the invention, accurate identification of different shapes of the expansive soil before and after expansion and shrinkage is realized, geometric parameters of the sample before and after change are accurately measured, operation errors and measurement errors of conventional indoor tests are eliminated, a digital basis is provided for accurate characterization of expansion and shrinkage characteristics of the expansive soil and in-depth research of anisotropy, and the expansive soil expansion and shrinkage test device is suitable for large-scale popularization and application. And a key technical basis is provided for strength characteristic research based on the swelling-shrinkage rule of the expansive soil, and meanwhile, technical guidance is provided for field expansion application of a three-dimensional scanning technology in field environments such as expansive soil side slopes and the like.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for testing and evaluating the expansion and contraction characteristics of expansive soil based on three-dimensional scanning. Background technique [0002] As a kind of high plastic clay, expansive soil is mainly composed of hydrophilic minerals, which makes expansive soil have the characteristics of water expansion, water loss shrinkage and repeated expansion and contraction deformation. It presents a very unstable nature, which brings many hidden dangers to engineering activities and site environment. [0003] At present, the main method for measuring the expansion and shrinkage characteristics of expansive soil is the laboratory test method. After the expansion is stable, the volume is measured again. The ratio of the added volume to the original volume is called the free expansion rate. [0004] However, there are still many deficiencies in the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G06F17/18
CPCG01N33/24G06F17/18
Inventor 蒋玉
Owner BAOSHAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com