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

Calculation method of lifting amount of low embankment top surface of ballastless track under expansion and contraction of expansive soil foundation

A ballastless track, calculation method technology, applied in the direction of road, calculation, track, etc., can solve the problem of unclear transmission mechanism and so on

Active Publication Date: 2019-01-22
CHINA RAILWAY ERYUAN ENG GRP CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the transmission mechanism of expansion and contraction deformation of expansive soil foundations in flexible foundations (such as railways and highway subgrades) is not yet clear, that is, the amount of ups and downs of the top surface of flexible foundations is different from the amount of expansion and contraction of the foundation surface. The applicability of the expansion and contraction deformation calculation method recommended in the Technical Code for Buildings in Land Areas to the calculation of the lifting and lowering of the top surface of flexible foundations needs to be further demonstrated

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
  • Calculation method of lifting amount of low embankment top surface of ballastless track under expansion and contraction of expansive soil foundation
  • Calculation method of lifting amount of low embankment top surface of ballastless track under expansion and contraction of expansive soil foundation
  • Calculation method of lifting amount of low embankment top surface of ballastless track under expansion and contraction of expansive soil foundation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0067] refer to figure 1 , The subgrade filling heights of the expansive soil foundation (medium-strong expansion potential) under the low embankment of Yungui Railway are 0.9, 1.9, and 2.7m respectively, the subgrade top surface width is 7.8m, and the side-slope ratio is 1:1.5. Settlement slabs are arranged in the center of the subgrade on the top of the embankment and the left (right) shoulder, and soil moisture measuring tubes are arranged in the center of the left (right) line in the foundation. January 1), the natural dry shrinkage period (September 2, 2013-May 24, 2014), and the natural rainy season (May 24, 2014-July 12, 2014).

[0068] figure 1 Among them, 1 represents the sand hole, 2 represents the sand tank, 3 represents the sand cushion, 4 represents the embankment body, 5 represents the composite geomembrane, 6 represents the soaking ditch, 7 represents the soil moisture measuring tube, and 8 represents the settlement plate.

[0069] The following is the calcula...

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

No PUM Login to View More

Abstract

The invention relates to a calculation method for ascending and descending amount of a top face of a low embankment of a ballastless track under the expansion-shrinkage action of an expansive soil foundation, so as to reasonably determine the ascending and descending amount of the top face of the low embankment under the expansion-shrinkage action of the expansive soil foundation in the flooding period, rainy seasons, dry seasons and the like, and provide bases for design of the low embankment of the ballastless track in the expansive soil zone. The calculation method is simple, easy for obtaining parameters, clear in physical meaning and capable of adapting to actual engineering demands. The method includes the following steps: (1) modifying the cross section of the rear low embankment by considering influence of the depth-width ratio of the embankment; (2) adopting the Boussinesq theory to calculate additional stress on the foundation under the modified low embankment load, and determining a modified low embankment calculation model; (3) calculating the ascending and descending amount of the top face of the low embankment under the expansion-shrinkage action of the expansive soil foundation by taking into consideration the 'compression' effect and 'unloading arch' effect of a low embankment body under the expansion-shrinkage action of the foundation.

Description

technical field [0001] The invention relates to the technical field of high-speed railway low embankments, in particular to a method for calculating the lifting amount of the top surface of a ballastless track low embankment under the expansion and contraction of an expansive soil foundation. technical background [0002] With the development of high-speed railway, the speed of train operation and the standard of railway construction have been continuously improved, and the deformation problem has become a controlling problem of foundation treatment. For expansive soil, in addition to the compression deformation under the action of external load, the expansion and contraction deformation of water-soaked expansion and dehydration contraction is also one of its important deformation characteristics, which is also an important characteristic different from ordinary soil. In general railway engineering, the expansion and contraction deformation of expansive soil foundation has r...

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 Patents(China)
IPC IPC(8): G06F17/50E01B2/00
CPCE01B2/00G06F30/13G06F30/17
Inventor 陈伟志李井元李安洪蒋关鲁王智猛曾永红龚建辉吴沛沛孙莺张健
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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