桩承式路堤土拱效应分析及土拱效应比的提出
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(厦门市工程检测中心有限公司，厦门 361004)［摘要］根据路堤荷载作用下的桩土变形特性，分析了桩承式路堤土拱效应的形成机理及形成条件。基于土拱效应的研究现状，提出了采用土拱效应比来反映土拱效应的发挥程度，通过现场试验的实测数据及数值分析对土拱效应比和桩体荷载分担比进行了对比分析。结果表明，土拱效应比能更合理全面地反映土拱效应的发挥程度；面积置换率是控制土拱效应发挥程度的关键因素，土拱效应比随着面积置换率的提高先增后减，存在一个最优值。［关键词］桩承式路堤; 土拱效应; 土拱效应比; 桩体荷载分担比; 面积置换率中图分类号：TU433,TU411.3 文献标识码：A 文章编号：1002-848X(2015)01-0094-04Soil arching effect analysis of pile-supported embankment and proposal of the soil arching effect ratioZhang Bafang(Xiamen Engineering Center Inspection Co., Ltd., Xiamen 361004, China)Abstract: According to the deformation characteristics of piles and soil under the embankment loadings, the formation mechanism of soil arching effect and its forming conditions of pile-supported embankment were analyzed. Based on the current study situation of soil arching effect, the soil arching effect ratio was suggested to reflect the utilization degree of soil arching effect. Based on the field measured results and the numerical simulation analyses, the soil arching effect ratio was compared analysis with pile efficacy. Results show that the soil arching effect ratio is more scientific and reasonable to reflect the utilization degree of soil arching effect; the area replacement ratio plays a key role in utilization degree of soil arching effect, and as the rise of the area replacement ratio, the soil arching effect ratio increases first and then decreases, which means that there exists a optimum valve of the soil arching effect ratio.Keywords: pile-supported embankment; soil arching effect; soil arching effect ratio; pile efficacy； area replacement ratio作者简介：张八芳，硕士，工程师，Email：zbafang@163.com。参考文献［1］周小文，濮家骝. 隧洞结构受力及变形特征的离心试验模型研究［J］. 清华大学学报:自然科学版，2001，41(8)：110-112.［2］周健，亓宾，曾庆有. 被动桩土拱效应与影响因素细观研究［J］. 建筑结构，2009，39(9)：100-103，77.［3］TERZAGHI K. Theoretical soil mechanic［M］. New York: John Wiley & Sons.,Inc., 1943.［4］朱小军，赵学亮，龚维明，等. 刚性桩复合地基垫层土拱效应宏细观机理研究［J］. 建筑结构，2014，44(1)：82-87.［5］杨明辉，汪罗成，赵明华. 有限土体主动土压力计算的土拱效应分析［J］. 建筑结构，2013，43(2)：71-75.［6］杨雪强，何世秀，庄心善. 土木工程中的成拱效应［J］. 湖北工学院学报，1994,9(1)：1-7.［7］朱朝辉. 建立考虑土拱效应的抗滑桩间距计算公式的尝试［J］. 建筑结构，2012，42(S2)：507-509.［8］席培胜，刘松玉. 水泥土深层搅拌法加固软弱地基新技术研究［J］. 施工技术，2006,31(1)：2-5.［9］HEWLETT W J, RANDOLPH M F. Analysis of piled embankments ［J］. Ground Engineering, 1988, 21(3): 12-18.［10］LOW B K, TANG S K, CHOA V. Arching in piled embankment［J］. Journal of Geotechnical Engineering, 1983, 120(11): 1917-1938.［11］陈云敏，贾宁，陈仁朋. 桩承式路堤土拱效应分析［J］. 中国公路学报，2004，10(4)：1-6.
