铁路路基下膨胀土长短微型桩抗隆起研究

doi:10.13722/j.cnki.jrme.2018.0876

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Abstract In unsaturated expansive soil regions，ground upheaval threats the safe operation of high-speed ballastless railway. To reduce or eliminate the ground upheaval and to cut down the engineering investment of high-speed railway，a long-short micropile structure considering atmospheric influence depth of unsaturated expansive soil foundations was proposed on the basis of the traditional micropiles. In accordance with several basic assumptions，an upheaval calculation methodology of expansive soil foundations reinforced by long-short micropiles was derived based on the analysis of working mechanics and stress path. Field tests of swelling-shrinkage responses of an expansive soil foundation under the subgrade bed of Yun-Gui high-speed railway were performed，and key design parameters were investigated. The results show that long-short micropiles can significantly reduce the upheaval of expansive soil foundations by about 60%. The ground upheaval can be reduced or even eliminated by increasing the pile diameter of long-short micropiles，reducing the pile spacing，optimizing the elevation of the railway line or appropriately increasing the pile length. Based on analysis of parameter sensitivity，influence weight ratio and pile setting scheme，a design principle of long-short micropiles to control ground upheaval under ballastless track subgrades in expansive soil regions was proposed，namely that small pile diameter and small pile spacing is recommended to reinforce expansive soils under ballastless track subgrade，that the length of long micropiles should be slightly larger than the critical pile length and not less than the atmospheric influence depth，and that the length of short micropiles should be greater than the depth of soil layer affected by atmosphere dramatically.

Key words： subgrade engineering railway subgrade ballastless truck expansive soil long-short micropile resisiting upheaval design parameters

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	Articles by authors
	CHEN Weizhi1
	LI Anhong1
	JIANG Guanlu2
	YAO Yuchun1
	YUAN Shengyang2
	LIU Yong1

Cite this article:

CHEN Weizhi1,LI Anhong1,JIANG Guanlu2, et al. Study on resisting upheaval of long-short micropiles of expansive soils under railway subgrade[J]. , 2019, 38(2): 409-423.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0876 OR http://www.rockmech.org/EN/Y2019/V38/I2/409

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