摘要
通过橡胶水泥土桩复合地基室内载荷试验,研究了橡胶水泥土桩复合地基的承载特性及橡胶粉掺量的影响。对于橡胶水泥土单桩复合地基,桩土荷载随上部荷载变化存在再分配过程。桩土应力比在加载过程中非定值,曲线呈上单凸峰变化。褥垫层厚度对橡胶水泥土单桩复合地基的桩土应力比同样有调节作用。随着橡胶粉掺量的增加,复合地基的比例界限值增加;桩身的应变增大并沿随桩身高度呈显著线性变化;桩土应力比值减小。研究表明,合理调整桩身橡胶粉掺量可以优化桩土应力比,改善复合地基承载性能。
Through indoor load tests on rubberized cement-soil pile composite foundation,its bearing behavior and the influences of rubber powder content were studied.For the rubberized cement-soil pile composite foundation,the bearing load of pile and soil is redistributed when the upper load changes.The value of pile-soil stress ratio is not definite in the loading process and the shape of pile-soil stress ratio curve has single upper leptokurtosis.The thickness of cushion also has regulating effect on pile-soil stress ratio.With the rubber powder content increasing,the ratio limit value of composite foundation increases;the strain along pile body height increases linearly significantly and the pile-soil stress ratio decreases.The results show that reasonable adjustment of rubber powder content can optimize the pile-soil stress ratio and improve the bearing capacity of composite foundation.
出处
《地下空间与工程学报》
CSCD
北大核心
2011年第6期1186-1190,共5页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金资助项目(50778115)
辽宁省自然科学基金资助项目(20102183)
关键词
橡胶水泥土
复合地基
桩土应力比
承载能力
rubberized cement-soil
composite foundation
pile-soil stress ratio
bearing capacity
