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A Calculation Method of Energy Dissipation Coefficient of Subgrade Filling under the Action of Foundation Uplift

A technology of subgrade and coefficient, which is applied in the test of foundation structure, foundation structure engineering, construction, etc., to achieve the effect of simple and fast measurement method

Active Publication Date: 2020-05-08
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problem facing the design is how to conveniently determine the energy dissipation coefficient of the subgrade fill, so as to reduce the workload of large-scale field tests or indoor model tests, and then achieve rapid development of the design method with the control target of the uplift of the top surface of the subgrade.

Method used

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  • A Calculation Method of Energy Dissipation Coefficient of Subgrade Filling under the Action of Foundation Uplift
  • A Calculation Method of Energy Dissipation Coefficient of Subgrade Filling under the Action of Foundation Uplift
  • A Calculation Method of Energy Dissipation Coefficient of Subgrade Filling under the Action of Foundation Uplift

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Experimental program
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Embodiment 1

[0041] refer to figure 1 , A ballastless track subgrade M of Yungui (Kunming-Nanning) railway has a filling height h of 2.7m, foundation D is unsaturated expansive soil, the width of the top surface of subgrade M is 13.4m, and the side-slope ratio of subgrade M is 1:1.5. The expansive soil foundation D at the bottom of the subgrade M has medium-strong expansion potential, and the base will be uplifted and deformed when it encounters water, which will lead to upward displacement on the top surface of the ballastless track subgrade M, affecting the normal operation of high-speed trains.

[0042] In order to determine the beneficial energy dissipation effect of the subgrade M filling under the action of the foundation D uplift, the method of the present invention is adopted below to determine the energy dissipation coefficient of the subgrade M under the action of the foundation D uplift, and the specific steps are as follows:

[0043] (1) Determine the dry density ρ of the subgr...

Embodiment 2

[0048] refer to figure 1 , a ballastless track embankment M of Iran’s Deyi (Tehran-Isfahan) high-speed railway has a filling height h of 1.8m, the foundation D is unsaturated saline soil, the width of the top surface of the embankment M is 13.4m, and the side slope of the embankment M is The ratio is 1:1.75. The unsaturated saline soil at the bottom of the subgrade M is prone to heaving and deformation during the cooling process, resulting in the upward displacement of the top surface of the ballastless track subgrade M, which affects the normal operation of high-speed trains.

[0049] In order to determine the beneficial energy dissipation effect of the subgrade M filling under the action of the foundation D uplift, the method of the present invention is adopted below to determine the energy dissipation coefficient of the subgrade M under the action of the foundation D uplift, and the specific steps are as follows:

[0050] (1) Determine the dry density ρ of the subgrade M f...

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Abstract

The invention discloses a calculation method of an energy dissipation coefficient of subgrade filling under the uplift action of a foundation. The energy dissipation coefficient of the subgrade filling under the uplift action of the foundation is determined scientifically and rationally, and the needs of practical engineering design and construction are met. The calculation method comprises the following steps that (1), a trenching sand filling method or a trenching irrigation method or a nuclear densimeter method is used for determining the subgrade filling dry density [rho]d, indoor compaction experiments are used for determining the largest subgrade filling dry density [rho]dmax, and the compaction coefficient K of the subgrade filling is determined; (2), the reciprocal beta of a limitvalue of the 'compression effect' coefficient of the subgrade filling is determined; (3), the reciprocal alpha of the 'compression effect' coefficient of an initial tangent line of the subgrade filling is determined; and (4), the energy dissipation coefficient kappa of the subgrade filling under the uplift action of the foundation is determined.

Description

technical field [0001] The invention relates to the technical field of high-speed railway embankment, in particular to a method for measuring and calculating the energy dissipation coefficient of embankment filling under the action of foundation uplift. [0002] technical background [0003] The uplift deformation of the foundation can easily lead to cracking of ballastless track slabs of high-speed railways, causing major ballastless track diseases, and even endangering the driving safety of high-speed trains, especially low embankments or cutting foundation beds of ballastless tracks. In engineering design, in the past, only attention was paid to the uplift of the subgrade base of the ballastless track, and it was used as the design control target, but the energy dissipation effect of the subgrade filling was ignored, which also easily led to excessive reinforcement of the foundation, increasing the number of projects, and lifting High rail investment. It can be seen that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 陈伟志郭在旭李安洪姚裕春周成曾永红吴沛沛曾锐向俐蓉王德军刘剑光田辉叶丹贾坤陈光华
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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