折减吸力在非饱和土土压力和膨胀量计算中的应用.pdfVIP

第 27 卷 增 2 岩石力学与工程学报 Vol.27 Supp.2 2008 年 9 月 Chinese Journal of Rock Mechanics and Engineering Sept. ，2008 折减吸力在非饱和土土压力和膨胀量 计算中的应用 1 2 2 2 陈铁林 ，陈生水 ，章为民 ，王年香 (1. 北京交通大学，北京 100044 ；2. 南京水利科学研究院，江苏 南京 210024) 摘要：根据变形等效原则介绍确定折减吸力的具体方法，采用折减吸力代替真实吸力进行非饱和土土压力系数和 膨胀量的计算，计算不同水位条件下非饱和土的静止土压力、主动土压力、被动土压力以及不同水位条件下非饱 和土的膨胀量和降雨条件下非饱和土的膨胀量。计算结果合理地反映了非饱和土土压力和膨胀量的分布趋势。将 计算结果与离心模型试验和模型槽试验结果进行对比，两者具有很好的一致性。 关键词：土力学；非饱和土；折减吸力；土压力；膨胀量 中图分类号：TU 43 文献标识码：A 文章编号：1000 –6915(2008)增 2 –3341 –08 APPLICATION OF REDUCED SUCTION TO EARTH PRESSURE CALCULATION OF UNSATURATED SOILS AND SWELL INCREMENT 1 2 2 2 CHEN Tielin ，CHEN Shengshui ，ZHANG Weimin ，WANG Nianxiang (1. Beijing Jiaotong University ，Beijing 100044，China；2. Nanjing Hydraulic Research Institute ，Nanjing ，Jiangsu 210024 ，China) Abstract ：A method of determination of reduced suction based on the principle of equivalence of deformation is introduced ；and the reduced suction is used as an essential variable in the earth pressure calculation of unsaturated soils on retaining wall and swell increment. The rest soil pressure，active soil pressure，passive soil pressure of unsaturated soil under different water table conditions ，and swell increment of unsaturated soil under different water level conditions and swell increment that are caused by rainfall have been considered. The calculation results have rationally reflected the distribution trend of unsaturated soil pressure and swell increment. Comparing the calculation results with the results of centrifuga