High speed railway subgrade compaction index lossless calculating method

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...

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

Images