土工合成材料加筋土地基承载性能数值分析  

Numerical Analysis of the Bearing Capacity of Geosynthetic Reinforced Soil Foundation

作　　者：沈盼盼[1] 徐超[1] 

机构地区：[1]同济大学岩土工程与地下结构教育部重点实验室,上海200092

出　　处：《长江科学院院报》2014年第3期106-110,127,共6页Journal of Changjiang River Scientific Research Institute

摘　　要：对土工合成材料加筋地基进行了数值模拟,旨在研究加筋材料布置方式对加筋地基承载性能的影响及其变化规律。在已有加筋土地基模型试验结果的基础上,建立了加筋土地基数值模型,针对不同的加筋材料布置方式,进行有限元计算并对结果进行了系统分析。分析结果表明:①随首层筋材埋深的增大,承载力提高系数先增大后减小,存在峰值;②加筋土地基承载力提高系数随加筋层数的增加而增大,但不宜超过3层;③承载力提高系数随加筋层间距的减小而增大,但存在一个合理的布筋间距;④随加筋长度增加,地基承载力提高而基础沉降减小,但加筋长度增加不宜超过3倍基础宽度。所得出的结论是,基础下存在一个合理的布筋范围,超过此范围,加筋对提高地基承载力作用不大。分析成果可为土工合成材料加筋土地基的工程应用提供借鉴。On the basis of laboratory model test,a numerical model of geosynthetic reinforced soil foundation was established.The influence of various reinforcement layouts on the bearing capacity and settlement of the foundation was calculated and analyzed.Results of the numerical simulation show that：1） as the placement depth of the top reinforcement layer increases,the bearing capacity improvement factor first increases and then decreases; 2） the bearing capacity improvement factor increases as the amount of reinforcement layer increases,yet no more than 3 layers of reinforcement are recommended ; 3） though the bearing capacity improvement factor increases as the vertical spacing between consecutive reinforcement layers decreases,there is a rational vertical spacing for reinforcements ; 4） as the length of the reinforcement increases,the bearing capacity of the reinforced soil foundation increases and the settlement decreases.The conclusion of this paper can be summarized that there is an optimum range for reinforcements to be placed under the foundation,beyond this range the reinforcements play no significant role in improving the bearing capacity.

关 键 词：土工合成材料加筋土地基 布筋方式 承载力提高系数 数值分析 

分 类 号：TU470[建筑科学—结构工程]