|
|
|
| Discussion on Design and Calculating Method for Reinforcing Subgrde with Oblique Cement Soil Pile |
| SONG Xu-guo，WANG Zhu |
| The Third Railway Survey and Design Institute Group Corporation，Tianjing 300251 |
|
|
|
|
Abstract Research purposes: The oblique cement soil pile is one of effective ways to reinforce the subgrade of the existing railway being open to service. However, there is no specification on its design and calculating methods，the pile spacing, pile length and pile strength are usually designed with experience. In this paper, starting from the reinforcement mechanism of the oblique cement soil pile，the design and calculating model is built for the oblique cement soil pile，and combined with the layerwise summation method，a new method for determining the vertical spacing and vertical row distance of the oblique cement soil pile is presented.
Research conclusions:(1)With this method，two symmetrical oblique cement soil piles are simplified as two equivalent sheets. ( 2 ) The top and bottom forces of the sheet and the bending moment are obtained by calculation of the balance relationship.(3)The pile spacing is determined by the tensile strength of pile body.(4)The Row spacing is determined by the ratio of settlement reduction after the subgrade reinforced to the total settlement without reinforcement (the ratio of reducing subsidence difference)，and the reducing subsidence ratio of no bigger than 5 % of a row is regarded as the control standard.(5)The method is clear in concept，simple in calculation and easy to be mastered by engineering and technical personnels and has a wide applicable prospect in reinforcing the subgrade.
|
|
Received: 10 April 2013
|
|
|
|
|
|
[1]TB 10001—2005，铁路路基设计规范[S].
TB 10001—2005，Code for Design on Subgrade of Railway[S].
[2]JGJ 79-2002 , J 220—2002，建筑地基处理技术规范[S].
JGJ 79-2002 , J 220—2002 , Technical Code for Groung Treatment of Buildings [ S ].
[3]龚晓南.地基处理手册(第三版)[M]北京:中国建筑工业出版社，2008.
Gong Xiaonan. Foundation Treatment Manual(The Third Edition )[M].Beijing: China Building Industry Press , 2008.
[4]林宗元.岩土工程治理手册[M].北京:中国建筑工业出版社，2005.
Lin Zongyuan. Geotechnical Engineering Governance Manual[M].Beijing: China Building Industry Press, 2005.
[5]徐至钧，全科政.高压喷射法处理地基[M].北京:机械工业出版社，2004.
Xu Zhijun, Quan Kezheng. High-pressure Injection Method for Foundation Processing [ M ].Beijing: China Machine Press, 2004.
[6]王定举.用斜向单管高压旋喷桩整治朔黄铁路路基病害 [J].铁道建筑，2006(9):55-57.
Wang Dingju. Shuo-Huang Railway Foundation Disease Remediation with Oblique Single-tube High- pressure Chemical Churning Pile[J].Railway Engineering , 2006 ( 9 ) : 55-57.
[7]王恩远，吴迈.工程实用地基处理手册[M].北京:中国建材工业出版社，2005.
Wang Enyuan, Wu Mai. Practical Engineering Foundation Treatment Manual[M].Beijing: China Building Materials Press , 2005.
[8]中国铁道科学研究院.大秦线2万吨货车条件下线桥设 备强化对策的试验研究[R].北京:中国铁道科学研究 院，2005.
China Academy of Railway Sciences. Experimental Study of Strengthen Measures for Track and Bridge with 20，000t Freight Train Running on Da-qin Railway[R].Beijing: China Academy of Railway Sciences , 2005.
[9]中国铁道科学研究院铁道建筑研究所.铁路路基基床结 构设计方法及参数的研究[R].北京:中国铁道科学研 究院铁道建筑研究所，2008.
Railway Engineering Research Institute of China Academy of Railway Sciences. Methods and Parameters Study of Railway Subgrade Bed Structure Design[R]. Beijing: Railway Engineering Research Institute of China Academy of Railway Sciences,2008.
[10 ] TB 10414—2003，铁路路基工程施工质量验收标准[S].
TB 10414—2003，Standard for Constructional Quality Acceptance of Railway Subgrade Engineering[S].
[11]刘建国.水平旋喷搅拌桩工法应用研究[J].铁道工程 学报，2002(2):103-106.
Liu Jianguo. Study on Application of Construction Method of Horizontal Swing-injected Agitating Pile [J].Journal of Railway Engineering Society , 2002 ( 2 ): 103-106.
|
|
|
|
2013, Vol. 30 
