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Safety controlling standard of subgrade's excavating free face in freeway rebuilding(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2012年02期
Page:
16-21
Research Field:
Publishing date:

Info

Title:
Safety controlling standard of subgrade's excavating free face in freeway rebuilding
Author(s):
SHI Xin1; 2
1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Department of Transportation, Shijiazhuang City Government, Shijiazhuang 050051, Hebei, China
Keywords:
road engineering;  freeway rebuilding;  subgrade;  excavating free face;  safety controlling standard;  finite element method
PACS:
U416.1
DOI:
-
Abstract:
In order to reasonably control subgrade stability and driving safety after excavating the free face of subgrade in the freeway rebuilding, the finite element simulation model was established, the effect of the excavation free face height, the vehicle load acting position and the soil property of the old subgrade on the working condition of subgrade were comprehensively analyzed. The stability coefficient of three different kinds of engineering conditions including cohesive soil, sandy soil and gravelly soil was calculated. On the basis of the above results, the safety controlling standard on the excavating free face of the highway rebuilding subgrade was finally put forward. The results show that the stability of the subgrade is impacted largely by the height of the excavating free face of subgrade and the vehicle loading position. The height of the excavating free face of subgrade should be controlled within 2.0 m, the road side safe distance of the excavating free face should be from 1.5 m to 2.0 m. The effect of the kinds of subgrade soil on the the stability of the subgrade is relatively small, the stability of cohesive soil is the best, followed by sandy soil and gravelly soil. On the basis of the difference of the stability coefficient, the height of subgrade is divided into five grades: less than 1.0 m, from 1.0 m to 1.5 m,from 1.5 m to 2.0 m,from 2.0 m to 3.0 m and from 3.0 m to 3.5 m, the safe controlling standard of excavating free face can be established by using the stability coefficient 1.80 as control index. 4 tabs, 8 figs, 10 refs.

References:

[1] 程光明.中外防洪标准与防洪措施[J].水利技术监督,1998,6(5):10-12. CHENG Guang-ming.The standard and prevention measures for flood control[J].Technical Supervision in Water Resources,1998,6(5):10-12.
[2]李家春,董卫卫,马保成.小桥涵水毁形式分析及防治措施[J].西部交通科技,2008(2):1-4. LI Jia-chun,DONG Wei-wei,MA Bao-cheng.The washout forms of small bridges and culverts and their prevention measures[J].Western China Communications Science & Technology,2008(2): 1-4.
[3]马保成.沿河公路路基水毁灾害评价及防治措施研究[D].西安:长安大学,2008.
[4]刘春换.沿河公路水毁识别技术研究[D].西安:长安大学,2009.
[5]高 婷.公路洪水灾害应急管理体系研究[D].西安:长安大学,2010.
[6]长安大学,陕西省交通厅,四川省交通厅.山区公路防排水评定方法与抗水灾评估指标的研究(调查报告一):山区沿河公路水毁现场调查分析研究报告[R].西安:长安大学,2006.
[7]田伟平,李家春,马保成.公路洪水灾害防治使用手册[M].北京:人民交通出版社,2011.
[8]李原圆.防洪若干重大问题研究[M].北京:中国水电水利出版社,2010.
[9]GB 50201—94,防洪标准[S].
[10]JTG C30—2002,公路工程水文勘测设计规范[S].
[11]JTG D60—2004,公路桥涵设计通用规范[S].
[12]JTG TD65—04—2007,公路涵洞设计细则[S].
[13]JTG D30—2004,公路路基设计规范[S].
[14]JTG B01—2003,公路工程技术标准[S].
[15]王开元.浅谈德法荷三国防洪减灾的主要做法和经验[J].人民珠江,2001(1):33-35. WANG Kai-yuan.The main procedure and the experience about flood of Germany,France and Holland[J].Pearl River,2001(1):33-35.

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Last Update: 2012-04-30