摘要
基于加筋材料的拉拔试验结果和极限平衡理论,针对具体边坡工程进行了不同加筋方案的计算与分析,对比了计算模型和设计方法的适用性,给出了满足边坡稳定条件的最佳设计方案。计算结果表明:采用改进瑞典法或荷兰法的计算结果相近且较原瑞典法有明显的提高,更能体现加筋效果;地震效应和地下水对加筋结构有较大影响;水利法应用于稳定地基上加筋边坡目的性强,能获得满足稳定性条件的合理布筋量;当地下水位较高时,筋材宜通铺。双层加筋效果较单层加筋有明显提高,但并非后者的简单叠加。单层加筋时,铺设位置对于边坡稳定性的影响有限,若铺设于坡身更能减少布筋量,降低造价。对比分析还表明,无论采用何种加筋方式,加筋前后的最危险滑弧位置均会发生改变,后者会向边坡中心和地基深处发展,对于提高其稳定性有明显作用。
The optimization process can be applied into the reinforced soil slopes. This paper presents the analyses of several reinforced soil designs for the same slope based on the pullout test results and different limit equilibrium analysis methods. Theoptimized design that meets the stability is then selected, The results indicate that, the factor of safety obtained by improvedSwedish method or Dutch Method have close results but both results are high than the original Swedish Method. The seismicand groundwater condition have large impact f the stability of the reinforced soil slopes. The Ministry of Water Resources sug-gested method has a prominent effect of the foundation stability of the reinforced soils. A reasonable reinforcement can be readily obtained. Full length distribution of geogrids is recommended when the groundwater table is high. The stability of doublelayer reinforcement is obviously higher than that of single layer but the stability is not a simple superimpose of two layers of reinforcement. The location has limited effects for single layer reinforcement. The cost reduction can be achieved by placing thesingle reinforcement at the middle portion of the slope. The further comparisons indicate that the potential failure plane willchange before and after the geogrid reinforcement regardless of the reinforcement scheme.
出处
《土工基础》
2014年第3期76-80,90,共6页
Soil Engineering and Foundation
关键词
土工格栅
加筋
稳定分析
优化设计
Geogrid
Reinforced Soils
Stability Analysis
Optimization Design
