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

A method for determining the uplift amount after the bottom pile foundation of the saline soil cutting foundation bed is strengthened

A determination method, saline soil technology, applied in the direction of instrumentation, geometric CAD, calculation, etc., can solve ballastless track disease, endanger the safety of high-speed trains, cannot consider pile foundation replacement, pile foundation anchoring saline soil's own gravity and other problems to achieve the effect of meeting actual engineering needs, fewer calculation parameters, and clear processes

Active Publication Date: 2018-12-18
CHINA RAILWAY ERYUAN ENG GRP CO LTD
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The saline soil foundation will bulge and deform under the condition of winter cooling, which will easily cause the ballastless track slab of high-speed railway to crack, cause major ballastless track diseases, and even endanger the driving safety of high-speed trains
Pile foundation reinforcement can effectively control the uplift deformation of saline soil foundation, but there is no feasible method to determine the amount of foundation uplift after pile foundation reinforcement. Pile foundation replacement, pile foundation anchorage, the influence of saline soil's own gravity, especially for the reinforcement of saline soil pile foundation at the bottom of the road cutting foundation bed, let alone the influence of cutting excavation unloading and foundation bed load

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
  • A method for determining the uplift amount after the bottom pile foundation of the saline soil cutting foundation bed is strengthened
  • A method for determining the uplift amount after the bottom pile foundation of the saline soil cutting foundation bed is strengthened
  • A method for determining the uplift amount after the bottom pile foundation of the saline soil cutting foundation bed is strengthened

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0047] refer to figure 1 A high-speed ballastless track cutting foundation bed was built in a saline soil D area. The cutting depth was 6.8m (the depth from the surface of the subgrade center to the bottom surface of the subgrade bed), the thickness of the surface layer 1 of the subgrade bed was 0.4m, and the thickness of the bottom layer 2 of the subgrade bed was 1.5m, the width of the top surface is 13.4m, and the ratio of cutting and slope is 1:1.75. The saline soil D at the bottom of the cutting foundation bed is prone to uplift and deformation during the winter cooling process. In order to weaken or eliminate the uplift deformation of the saline soil D, pile foundation 3 is proposed to be used for foundation reinforcement. Foundation 3 shall be arranged with piles at equal intervals in a square, with a pile spacing of 1.4m.

[0048] Adopt the inventive method below to determine the amount of uplift (position is the embankment center) after the saline soil D pile foundati...

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 method for determining the uplift amount after the bottom pile foundation of the saline soil cutting foundation bed is strengthened, which can scientifically and reasonablydetermine the uplift amount of the bottom pile foundation of the saline soil cutting foundation bed after consolidation, and can meet the needs of practical engineering. The method comprises the following steps: determining the neutral point depth l0 of the pile foundation in the saline soil, the atmospheric cooling influence depth l below the top surface of the cutting foundation bed, and calculating and determining the calculated thickness h0 of the pile foundation uplift deformation at the bottom of the cutting foundation bed; determining the temperature Ti 1 and other parameters of the i-layer soil before cooling in winter; carrying out salt dilatancy test, compression test, water content test, soil particle specific gravity test and weight test on saline soil samples to determine thesalt dilatancy index Csi of the i-th layer soil; determining the uplift amount se after the bottom pile foundation of the saline soil cutting foundation bed is strengthened by the following formula (shown in the description).

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for determining the amount of uplift after reinforcement of pile foundations at the bottom of a saline soil road cutting foundation bed. technical background [0002] At present, the amount of salt expansion (i.e. the amount of uplift) of saline soil foundations is mostly determined by the "Building Code for Saline Soil Areas" (SY / T0317—2012), that is, the amount of salt expansion is determined according to the following formula: [0003] S η0 =η·H [0004] In the formula, S η0 is the total salt expansion of the saline soil foundation, in mm; η is the salt expansion coefficient; H is the thickness of the effective salt expansion area, in mm. [0005] The saline soil foundation will bulge and deform under the condition of winter cooling, which can easily lead to cracking of ballastless track slabs of high-speed railways, causing major ballastless track...

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): G06F17/50
CPCG06F30/13
Inventor 陈伟志李安洪姚裕春吴沛沛李楚根刘勇曾永红郭在旭胡会星张莎莎刘剑光秦谢宇李伯根陈颖
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