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High speed railway subgrade compaction index lossless calculating method

A technology for high-speed railways and subgrades, which is applied in the field of foundation soil survey, infrastructure engineering, construction, etc. It can solve the problems of consuming manpower, material resources and financial resources, destroying existing subgrade projects, increasing project investment, etc., to achieve fast operation, The effect of strong engineering adaptability and simple calculation

Active Publication Date: 2018-02-16
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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AI Technical Summary

Problems solved by technology

For high-speed railway subgrades that have been built overseas, the above-mentioned index parameter tests can only be carried out on the subgrade surface layer that has been constructed. For the internal compaction index test of the subgrade, if layered excavation and layered tests are used, not only will the existing subgrade project be destroyed, Re-filling construction is still required, which increases project investment and greatly consumes manpower, material and financial resources, and it is difficult for this test plan to be recognized by local owners and consulting units
On the other hand, there is no railway regulations or documents such as "Code for Design of High Speed ​​Railway" (TB10621-2014), "Code for Design of Railway Subgrade" (TB10001-2016), "Code for Geotechnical Test of Railway Engineering" (TB10102-2010), etc. The calculation method of the subgrade compaction index that maintains the original appearance shows that there is a technical gap in this field, and it is urgent to propose a method for the calculation of the high-speed railway subgrade compaction index that maintains the original appearance

Method used

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  • High speed railway subgrade compaction index lossless calculating method
  • High speed railway subgrade compaction index lossless calculating method
  • High speed railway subgrade compaction index lossless calculating method

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Experimental program
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Embodiment

[0028] refer to figure 1 , a filling embankment of Iran's Deh-Iran (Tehran-Qom-Isfahan) high-speed railway was filled with a height of 4.2m.

[0029] In order to verify the feasibility of the method of the present invention, after measuring the number of hammer blows at different vertical depths H below the roadbed surface layer, the roadbed section is excavated layer by layer, and the in-situ test is carried out at the position corresponding to the dynamic penetrating hammering. Take compaction coefficient K and foundation coefficient K 30 and dynamic deformation modulus E vd . Adopt the inventive method below to measure and calculate this subgrade compaction index, concrete steps are as follows:

[0030] Step (1): along the figure 1 In the center of the subgrade surface layer, heavy-duty dynamic penetrating tests were carried out at vertical depths H of 0, 0.5, 1.2, 2.1, 3.1, and 4.0m, corresponding to the measured hammer number N 63.5 They are 24.8, 22.9, 34.0, 13.6, 2...

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Abstract

The invention relates to a high speed railway subgrade compaction index lossless calculating method. On the premise that a built subgrade is not damaged, compaction indexes including K, K30, EVd and the like inside the subgrade are effectively obtained. The method includes the following steps that (1) heavy dynamic touch testing is developed in the center of a subgrade face layer in the vertical direction, and the hammering number N63.5 at different vertical depths H below the subgrade face layer are measured; (2) the subgrade compaction indexes including K, K30 and EVd are determined according to the following formula, and please see the specification for the formula; and (3) holes formed due to the heavy dynamic touch testing in the step (1) is subject to cement mortar or medium-coarse sand backfill compaction.

Description

technical field [0001] The invention relates to a high-speed railway roadbed, in particular to a non-destructive measurement method for a high-speed railway roadbed compaction index. technical background [0002] With the advent of the rapid development of high-speed railways, more and more overseas countries are focusing on the construction of high-speed railways, and some countries with relatively developed economies have carried out high-speed railway design and construction with reference to European standards or UIC (International Union of Railways) standards. However, due to lack of funds, technology shortage, local political environment and other reasons, it is difficult to continue the construction of the high-speed rail project, that is, the construction of civil engineering is interrupted. With the implementation of the "Belt and Road" initiative, it is imperative for China's high-speed railway to go overseas, and the technical standards going abroad are the key to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D1/08
CPCE02D1/08
Inventor 陈伟志吴沛沛胡超李安洪李楚根胡会星姚裕春任华锋刘刚郭在旭梅万波朱曦林东升秦谢宇
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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