|
|
|
Calculation for pile efficacy of geosynthetic-reinforced and
pilesupported embankment |
| ZHANG Jun, ZHENG Jun-jie, MA Qiang |
| Institute of Geotechnical and Underground Engineering, Huazhong University of Science and Technology, Wuhan 430074, China |
|
|
|
Abstract The interaction mechanism of embankment fill, geogrid, pile and soil under the embankment load was analyzed, aimed at the complex characteristics of the soft soil subgrade reinforced by geosynthetic and pile. The embankment fill and improved area were treated as a whole with continuous displacement and stress. The horizontal reinforced mattress was modeled as a thin plate to consider the effect of geosynthetic. The deformation was calculated by the thin plate theory. Then the arching effect in embankment and the interaction of pile and soil were considered. The function of pile efficacy was deduced under the conditions that the soft ground is fully reinforced and partially reinforced. The method was validated by comparing with the test results in the literature. Results show that the analytical solutions agreed with the measured data, so the method is applicable in engineering practice.
|
|
Published: 01 October 2010
|
|
|
桩承式加筋路堤荷载分担比计算方法
针对桩承式加筋路堤作用机理复杂的问题,分析路堤填土筋材桩桩间土在路堤荷载作用下的荷载传递机理.根据位移、应力连续条件,将路堤填土和加固区作为统一的整体考虑.将一定厚度水平向的加筋垫层视为具有刚度的薄板,考虑土工格栅的加筋作用,采用大挠度薄板理论计算筋材的挠曲变形.考虑路堤填土的土拱效应和路基桩土相互作用,推导在桩体打穿和未打穿软土层2种情况下桩承式加筋路堤荷载分担比的求解方法.采用相关文献中的模型试验结果对提出的计算方法进行验证.结果表明,采用该方法计算出的桩土应力比与实测结果比较接近,可为工程实践提供设计理论参考.
|
|
| ［1］ ABUSHARAR S W, ZHENG J J, CHEN B G. A simplified method for analysis of a piled embankment reinforced with geosynthetics ［J］. Geotextiles and Geomembranes, 2009, 27(1): 39-52.
［2］ ZHENG J J, CHEN B G, ABUSHARAR S W. The performance of an embankment on soft ground reinforced with geosynthetics and pile walls ［J］. Geosynthetics International, 2009, 16(3): 171-181.
［3］ ROBERT M K. Emerging and future developments of selected geosynthetic applications ［J］. Journal of Geotechnical and Geoenvironmental Engineering, 2000, 126(4): 293-306.
［4］ HEWLETT W J, RANDOLPH M F. Analysis of piled embankments ［J］. Ground Engineering, 1988, 21(3): 12-18.
［5］ 饶为国,赵成刚.桩网复合地基应力比分析与计算［J］.土木工程学报,2002,35(2): 74-80.
RAO Weiguo, ZHAO Chenggang. The behavior of pilesoil composite foundation. ［J］. China Civil Engineering Journal, 2002, 35(2): 74-80.
［6］ 郑俊杰,张军,马强.双向增强体复合地基桩土应力比三维分析［J］.华中科技大学学报:自然科学版,2010,38(2): 83-86.
ZHENG Junjie, ZHANG Jun, MA Qiang. 3D analysis of pilesoil stress ratio of biaxial reinforcement composite foundation ［J］. Journal of Huazhong University of Science and Technology: Natural Science Edition, 2010, 38(2): 83-86.
［7］ British Standard Institute. British Standard 8006, Strengthened/ reinforced soils and other fills ［S］. London: British Standard Institute, 1995.
［8］ CHEN Y M, CAO W P, CHEN R P. An experimental investigation of soil arching within basal reinforced and unreinforced piled embankments ［J］. Geotextiles and Geomembranes, 2008, 26(2): 164-174.
［9］ LOW B K, TANG S K, CHOA V. Arching in piled embankments ［J］. Journal of Geotechnical Engineering, 1993, 120(11): 1917-1938. |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
