基于Terzaghi极限承载力理论的加筋地基承载力研究

刘拴奇; 张昌军; 张文娟; 田楠; 张斌

doi:10.13204/j.gyjzG20072603

基于Terzaghi极限承载力理论的加筋地基承载力研究

doi: 10.13204/j.gyjzG20072603

机械工业勘察设计研究院有限公司, 西安 710043

详细信息

作者简介:
刘拴奇,男,1987年出生,硕士,工程师。电子信箱:867940688@qq.com

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出版历程
- 收稿日期: 2020-07-26
- 网络出版日期: 2021-08-19

RESEACH ON ULTIMATE BEARING CAPACITY OF REINFORCED FOUNDATION BASED ON TERZAGHI THEORY ON ULTIMATE BEARING CAPACITY OF FOUNDATION

China Jikan Research Institute of Engineering Investigations and Design Co., Ltd., Xi'an 710043, China

摘要

摘要: 为研究筋带对地基承载力的影响，基于Terzaghi极限承载力理论，采用极限平衡法和条分法计算了无黏性土加筋地基的极限承载力。首先，将地基滑裂土体分为主动区、过渡区和被动区。其中，主动区侧面与水平面的夹角δ₁不再为固定值，而应满足地基破坏时承载力最小的原则。其次，过渡区滑面为对数螺旋线，计算时采用折线代替从而将过渡区划分为若干三角条块。最后，将筋带等效为作用在三角条块上的拉力，利用极限平衡理论计算被动区、过渡区、主动区各条块的受力，求出不同δ₁对应的地基极限承载力，进而可得到最小地基承载力。同时，分析了筋带层数、埋深和间距、长度及内摩擦角对地基承载力的影响。通过与试验数据对比，验证了本文方法的可行性。
- 极限承载力 /
- 加筋地基 /
- 条形基础
Abstract: In order to study the effect of reinforcement on the bearing capacity of foundation, the limit equilibrium method and slice method were adopted for calculating the ultimate bearing capacity of reinforced foundation in non-cohensive soil based on Terzaghi ultimate bearing capacity theory.The slip blocks of foundation were divided into the active zone, transition zone and passive zone, in which the angle δ₁ between the side of the active zone and horizontal plane was not a fixed value but could meet the minimum prinicple of the bearing capacity of the foundation at failure. The sliding surface of the transition zone assumed to be a logarithmic spiral was divided into many triangular slices in calculation. The reinforcement was equivalent to tensile forces acting on the blocks. Based on the limit equilibrium theory, the force equilibrum formulas on the passive zone, active zone and transition zone were established,which could calculate the angles of δ₁ corresponding to the ultimate bearing capacity of foundation. By optimizing δ₁, the minimum bearing capacity of foundation could be calculated. The effects of the layers of being reinforced, embedment, spacing, length and internal friction angles on the bearing capacity of foundation were also analyzed. By comparison with experimental data, the feasibility of the method was verified.
- ultimate bearing capacity /
- reinforced foundation /
- strip footing

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参考文献(13)

[1]	VIDAL H. The Principle of Reinforced Earth[J]. Highway Research Record, 1969, 282:1-16.
[2]	BINQUET J, LEE K L. Bearing Capacity Tests on Reinforced Earth Slabs[J]. Journal of Geotechnical Engineering, 1975, 101(12):1241-1255.
[3]	ABU-FARSAKH M, CHEN Q M, SHARMA R. An Experimental Evaluation of the Behavior of Footings on Geosynthetic-Reinforced Sand[J]. Soils and Foundations, 2013, 53(2):335-348.
[4]	柏蕾, 王家全, 周圆兀,等.加筋地基室内大模型试验尺寸效应分析[J].广西科技大学学报, 2019, 30(4):23-29.
[5]	OTANI J, OCHIAI H, YAMAMOTO K. Bearing Capacity Analysis of Reinforced Foundations on Cohesive Soil[J]. Geotextiles and Geomembranes, 1998, 16(4):195-206.
[6]	介玉新, 李广信. 加筋土数值计算的等效附加应力法[J]. 岩土工程学报, 1999, 21(5):614-616.
[7]	刘庆潭, 刘启凤, 华祖焜,等. 用极限平衡法确定加筋土地基的极限承载力[J]. 长沙铁道学院学报, 1997, 15(4):65-73.
[8]	陈蓉, 栾茂田, 郝冬雪,等.加筋地基极限承载力的变分解法[J]. 岩土工程学报, 2010, 32(5):774-779.
[9]	刘拴奇, 卢坤林, 朱大勇, 等. 条形基础加筋砂土地基极限承载力计算[J]. 岩土力学, 2015,36(8):2307-2314.
[10]	栾茂田, 李敬峰, 肖成志.土工格栅加筋挡土墙工作性能的非线性有限元数值分析[J]. 岩石力学与工程学报, 2005, 24(14):2428-2433.
[11]	TERZAGHI K. Theoretical Soil Mechanics[M]. New York:John Wiley and Sons, 1943.
[12]	ZHU D Y. A Method for Locating Critical Slip Surfaces in Slope Stability Analysis[J].Canadian Geotechnical Journal, 2001,38(2):328- 337.
[13]	JU J W. Capacity of Sand Foundation Reinforced by Geonet[C]//Proceedings of International Symposium on Earth Reinforcement. 1996:603-608.