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Determination method of minimum replacement thickness of basement of expansive rock-soil cutting and low embankment

A determination method and expansive rock technology, applied in the direction of geometric CAD, special data processing applications, etc., can solve problems such as inconsistent thickness standards for excavation and replacement, lack of calculation theory, and ballastless track defects

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

Uplift deformation of expansive rock and soil at the base of road cuttings or low embankments may cause cracking of ballastless track slabs, resulting in major ballastless track defects
[0004] At present, the treatment measures for expansive soil in cuttings and low embankment bases in expansive soil areas of high-speed railways at home and abroad are mainly replaced by high-quality fillers, but the thickness standards for excavation and replacement are not uniform, and there is a lack of corresponding calculation theory as support

Method used

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  • Determination method of minimum replacement thickness of basement of expansive rock-soil cutting and low embankment
  • Determination method of minimum replacement thickness of basement of expansive rock-soil cutting and low embankment
  • Determination method of minimum replacement thickness of basement of expansive rock-soil cutting and low embankment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] refer to figure 1 The excavation depth of an expansive rock-soil cutting on Iran’s Dehran-Qom-Isfahan high-speed railway was 6.39m, the width of the top surface of the cutting bed was 13.4m, and the cutting-side-slope ratio was 1:1.25. The thickness of the cutting base replacement body is H.

[0038] figure 1 Among them, the mark 1 is the surface layer of the foundation bed, and the mark 2 is the base replacement body.

[0039] Step ①, according to the deformation control requirements of high-speed railway ballastless track, the allowable uplift deformation of the top surface of the surface layer 1 of the expansive rock-soil cutting subgrade Take 1.0mm.

[0040] Step ②, through on-site geological drilling and indoor geotechnical testing, the expansion force σ of the expansive rock and soil layer in the dry season is obtained sN and the remaining expansive force σ of the expansive soil layer after the rainy season sP Along the depth distribution see figure 2 , th...

Embodiment 2

[0048] refer to Figure 5 The filling height of the low embankment on a certain expansive rock soil of Yungui (Kunming to Nanning) high-speed railway in China is 1.60m, the width of the top surface of the subgrade bed of the low embankment is 13.4m, the slope ratio of the low embankment is 1:1.5, and the low embankment The thickness of the base replacement body is H.

[0049] Figure 5 Among them, mark 1 is the surface layer of the subgrade bed, mark 2 is the base replacement body, and mark 3 is the low embankment filling body.

[0050] Step ①, according to the deformation control requirements of high-speed railway ballastless track, the allowable uplift deformation of the top surface of the surface layer 1 of the expansive rock-soil low embankment bed Take 1.0mm.

[0051] Step ②, through on-site geological drilling and indoor geotechnical testing, the expansion force σ of the expansive rock and soil layer in the dry season is obtained sN and the remaining expansive force...

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Abstract

The invention discloses a method for determining minimum replacement thicknesses of ballastless track swelling soil cuttings and low-embankment bases, and aims at reasonably determining the minimum replacement thicknesses of ballastless track swelling soil cuttings and low-embankment bases, and providing theoretical calculation support for digging and replacement of bases in swelling soil areas. The method comprises the following steps of: determining allowed hump deformation amounts (as shown in the specification) of the top surfaces of surface layers of a swelling soil cutting and a low-embankment subgrade; through taking the hump deformation amounts (as shown in the specification) of the top surfaces of the surface layers of the cutting and the low-embankment subgrade as control targets, calculating hump deformation amounts (as shown in the specification) of the top surfaces of surface layers of subgrades on base replacement bodies with different thicknesses H through the following formula (as shown in the specification); and determining the minimum replacement thicknesses Hmin of the ballastless track swelling soil cutting and the low-embankment base according to the hump deformation amount calculation results and a condition (as shown in the specification).

Description

technical field [0001] The invention relates to a high-speed railway subgrade, in particular to a method for determining the replacement thickness of a ballastless track expansive rock-soil cutting and a low embankment base. [0002] technical background [0003] High-speed railway ballastless track has strict requirements on deformation control. Uplift or subsidence deformation will cause aggravated line irregularity, endanger the normal operation of high-speed trains, and may even cause major safety accidents. In engineering construction, most expansive rocks and soils belong to the category of unsaturated soils. Under the conditions of atmospheric rainfall or external water seepage, unsaturated expansive rocks and soils absorb water and cause expansion deformation. The uplift deformation of expansive rock and soil at the base of cuttings or low embankments may cause cracking of ballastless track slabs, resulting in major ballastless track diseases. [0004] At present, hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13
CPCG06F30/13
Inventor 陈伟志李井元龚建辉蒋关鲁李安洪周成叶世斌王智猛丁兆峰叶丹张健孙晓
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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