文章摘要
徐超,吴迪,高彦斌,杨阳.基于离心模型试验的桩承加筋路堤筋材设置方法研究[J].水利学报,2012,43(12):
基于离心模型试验的桩承加筋路堤筋材设置方法研究
Research on settings of reinforcement material in geosynthetic reinforced and pile supported embankment based on centrifuge model tests
  
DOI：
中文关键词: 桩承式加筋路堤  土工格栅  反包设置  加筋作用  离心模型试验
英文关键词: geosynthetic reinforced and pile supported （GRPS） embankment  geogrid  wrapped-back setting  reinforcement effect  centrifuge model test
基金项目:
作者单位
徐超 1. 同济大学地下建筑与工程系，上海200092；2. 同济大学岩土及地下工程教育部重点实验室，上海200092 
吴迪 同济大学地下建筑与工程系，上海200092 
高彦斌 1. 同济大学地下建筑与工程系，上海200092；2. 同济大学岩土及地下工程教育部重点实验室，上海200092 
杨阳 同济大学地下建筑与工程系，上海200092 
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中文摘要:
      在土工合成材料加筋土工程中加筋材料的合理设置对充分发挥筋材的作用至关重要。通过4组离心模型试验，研究了桩承式加筋路堤垫层中土工格栅两边端部反包设置的使用效果，包括对路堤稳定性、桩土荷载分担等的影响。结果表明：①加筋材料反包设置相当于将筋材锚固于路堤中，可充分发挥筋材的加筋作用，与加筋不反包相比，测得路肩下方格栅承受的拉力较大，而路堤中心处格栅受力相对较小；②加筋反包设置可提高桩土应力比，促使荷载向桩体转移；③加筋反包可降低路堤表面总沉降及不均匀沉降，减小地基土的侧向位移，提高路堤地基整体性和稳定性；④加筋材料的力学性质对加筋受力、桩土荷载分担和路堤变形存在较大影响，延伸率低、拉伸模量高的加筋材料更能发挥加筋膜效应。
英文摘要:
      It is important to use a reasonable setting of geosynthetic for fully playing the role of reinforcement in reinforced structures. To study the effect of wrapped-back setting of geogrid ends in GRPS embankments，four groups of centrifuge model tests were performed. According to the test results，the embankment stability and the loads shared by pile and soil were analyzed. The following results are achieved： ①Wrapped-back setting is equivalent to a geosynthetic anchor in the embankment， through which the potential performance of reinforcement can be fully demonstrated， the tensile force of geogrid below the shoulder of embankment is larger than that in the center of embankment；②Wrapped-back setting of geogrid can increase the pile-soil stress ratio and enhance the embankment load transferring to the piles； ③Wrapped-back setting of geogrid can not only reduce the total and differential settlement of embankment surface and the lateral displacement of foundation soil， but also improve the integrity and stability of embankment and foundation； ④The mechanical properties of geosynthetic have some important impacts on the tensile force， loads shared by pile and soil， and embankment deformation， and it is proved that a greater tensioned membrane effect is illustrated using the reinforcement material with smaller elongation and bigger tensile modulus.
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