毛    前    （浙江水电专科学校水利系 杭州 310016） 

    龚晓南    （浙江大学土木系 杭州 310027）

 

[提要]  运用快速拉格朗日元有限差分分析程序FLAC，对复合地基在局部均布荷载作用下的附加应力分布和变形场进行了分析，讨论了复合模量与周围土的模量之比E_c/E_s以及加固区高宽比L/B两个指标对下卧层的应力集中和变形场的影响，并进而探讨了下卧层计算深度的确定问题。
[关键词]  复合地基 下卧层 有限差分 计算深度

With an explicit finite difference program FLAC, the superimposd stress distribution and displancement field of composite groud is analysed, and then the influence on the stress concentration and displacement field caused by the two index E_c/E_s, the ratio about composite modulus to round soil modulus, and L/B, the ratio about depth to width of reinforced area is discussed. Further more, the problem of determining the calculate depth of the compression zone is also discussed.
Keywords: composite ground; substratum; finite differnce; calculate depth