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³¤°²´óѧѧ±¨£¨×ÔÈ»¿Æѧ°æ£©[ISSN:1006-6977/CN:61-1281/TN]

Issue:

2019Äê03ÆÚ

Page:

53-64

Research Field:

ÇÅÁºÓëËíµÀ¹¤³Ì

Publishing date:

Info

Title:

Influence of gully topography on stress of high fill slab culverts andª¤ settlement characteristics of fill

Author(s):

FENG Zhongª²juª¬1;  DONG Yunª²xiuª¬ª©1; 2ªª;  PAN Fangª¬3;  HAO Yuª²mengª¬4; ª¤ LI Shaoª²jieª¬1;  JIAN Xinª²longª¬5

(1. School of Highway, Chang¬ðan University, Xi¬ðan 710064, Shaanxi, China; 2. School of Civil Engineering,ª¤ Longdong University, Qingyang 745000, Gansu, China; 3. Guangdong Province Expressway Co., Ltd,ª¤ Guangzhou 510000, Guangdong, China; 4. CCCC Second Highway Consultant Co., Ltd., Wuhan 430056,ª¤ Hubei, China; 5. Guangdong Dachao Expressway Co., Ltd, Guangzhou 510000, Guangdong, China)

Keywords:

bridge engineering;  geotechnical engineering;  gully topography;  centrifugal model test;  slab culvert;  earth pressure;  settlement deformation

PACS:

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DOI:

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Abstract:

To study the influence of the gully topography on the stress of high fill slab culverts and settlement characteristics of the fill, a centrifugal model test was carried out, using a selfª²developed model test platform which can reflecting the interactions among the topography, culvert, and fill. The variation characteristics of the earth pressure of the culvertª²soil interface, fill settlement, internal force of the culvert structure, and the vertical soil pressure concentration coefficient ª«Kª«ª­s under different valley widths ª«Bª« and different valley slopes ª«¦Áª« were analyzed. Furthermore, relevant engineering technical recommendations were presented. The results show that the earth pressure of the culvertª²soil interface and the vertical soil pressure concentration coefficient ª«Kª«ª­s are positively correlated with the valley widths, and are negatively correlated with the valley slopes. The settlement of the fill at the culvert top shows a W shaped distribution. With an increase in the valley widths, the difference between the internal and external settlements of the soil increases gradually. Further, with an increase in the valley widths, the settlement ª«¦Äª« of the fill gradually increases. With an increase in the slopes of the valley, the settlement difference between the inside and outside of the fill is ª«¦Äª«¡ú0¡ú-ª«¦Äª«. When the gully width is 1.5ª«Dª« to 5ª«Dª«, where ª«Dª« is the culvert span, the range of change in the equal settlement section height is 12.2 to 13.7 m. When the gully slope is 0¡ã to 60¡ã, the range of change in the equal settlement section height is 12.5 to 13.7 m. Moreover, the equal settlement section height is used to determine whether the culvert is a high fill culvert, and 14 m is taken as the defined height. The lower edge of the cover plate and the middle of the upper edge of the culvert floor are subjected to a tensile stress, and the lower edge of the cover plate is the most unfavorable position of the slab culvert structure. The construction of high fill slab culverts can make full use of the original topography. Under the premise of slope stability, to retain the gully as far as possible, or to apply antiª²excavation construction methods, artificially increase the gully gradient and reduce the gully width. A gully width of ª«Bª«¡Ü 3ª«Dª« and a gully slope of ª«¦Áª«¡Ý45¡ã are advisable. ª©3 tabsªª, 17 figs, 26 refs.

References:

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Last Update: 2019-05-23