浅覆土特长箱涵顶进结构受力特性数值分析

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摘要 An example of a project on an oversized box culvert jacked into highway subgrade in Guangdong area was investigated to determine the mechanical behavior of shallow soil-covered super-long box culvert in the jacking construction process. On the basis of 3D finite element simulation, the law for stress-strain change and the effective construction area of the box were studied by considering different lengths and thicknesses and drag reduction versus non-drag reduction of overburden soil. Result shows that under the same working condition, the stress-strain of the roof and bottom plate exhibits an "armchair" change shape with an increase in jacking length, whereas the side wall presents a "trapezoid" shape in the box culvert jacking process. The thickness and characteristics of the covered soil (on top of the box culvert) exert considerable influences on the stress-strain of the box culvert structure. If the covered soil is thick and dense, then the stress-strain of the structure will be high. The pavement (on top of the box culvert) settlement ranges from 7.0-17.1 mm due to the effect of vibrations produced during box culvert jacking construction, and the scope of the disturbed roadbed and road surface is 23-30 m along the jacking direction. The drag reduction effect of the paraffin oil mixture is more effective than that of slurry drag reduction. The research results will play a significant guiding role in the design and construction of similar projects.

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关键词 ： road engineering, mechanical characteristics, numerical simulation, shallow soil-covered and super-long box culvert

Abstract：An example of a project on an oversized box culvert jacked into highway subgrade in Guangdong area was investigated to determine the mechanical behavior of shallow soil-covered super-long box culvert in the jacking construction process. On the basis of 3D finite element simulation, the law for stress-strain change and the effective construction area of the box were studied by considering different lengths and thicknesses and drag reduction versus non-drag reduction of overburden soil. Result shows that under the same working condition, the stress-strain of the roof and bottom plate exhibits an "armchair" change shape with an increase in jacking length, whereas the side wall presents a "trapezoid" shape in the box culvert jacking process. The thickness and characteristics of the covered soil (on top of the box culvert) exert considerable influences on the stress-strain of the box culvert structure. If the covered soil is thick and dense, then the stress-strain of the structure will be high. The pavement (on top of the box culvert) settlement ranges from 7.0-17.1 mm due to the effect of vibrations produced during box culvert jacking construction, and the scope of the disturbed roadbed and road surface is 23-30 m along the jacking direction. The drag reduction effect of the paraffin oil mixture is more effective than that of slurry drag reduction. The research results will play a significant guiding role in the design and construction of similar projects.

Key words： road engineering mechanical characteristics numerical simulation shallow soil-covered and super-long box culvert

收稿日期: 2016-05-30

基金资助:Supported by the Talent Introduction Fund by Shaanxi University of Technology (SLGQD16-11; SLGQD2017-01)

通讯作者: GUO Rui E-mail: grlch2356@163.com

引用本文:

郭瑞, 蒋红. 浅覆土特长箱涵顶进结构受力特性数值分析[J]. Journal of Highway and Transportation Research and Development, 2018, 12(2): 38-42.
GUO Rui, JIANG Hong. Force and Deformation of a Shallow Soil-buried Super-long Box Culvert during Jacking Construction on a Highway. Journal of Highway and Transportation Research and Development, 2018, 12(2): 38-42.

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http://manu27.magtech.com.cn/Jwk_gljtkj_en/CN/ 或 http://manu27.magtech.com.cn/Jwk_gljtkj_en/CN/Y2018/V12/I2/38

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