振冲法处理淤泥土体的研究

18层住宅楼建在天然地基中的含淤泥土层上, 地基采用振冲法处理。通过对各楼不同层位处的载荷试验和主体施工中的沉降观测得出: 较厚淤泥层上的高层建筑地基采用振冲法处理可以取得经济可靠的效果; 加大振冲器功率可使基础沉降效果明显减小; 振冲桩复合地基中附加应力扩散现象随软土层上部相对硬层强度增加而增加, 但以上部土层厚度影响为主; 对于筏板基础, 载荷试验曲线初段受深度影响不能真实反映复合地基的压缩性。

Study of the treatment of marine clay by vibroflotation

A residential buildings with 18 story built on the ground consisting of softmarine clay and the sub-grade was treated with vibroflotation. The load tests on different sites and layers and the settlement observations in main struction construction indicate that treat the softmarine clay with vibroflotation is economical and reliable for higher buildings; enlarge the power of vibration can diminish the effect of foundational settlement distinctly; the external stress in composite subgrade diffuses more rapidly with the increase of intensity in the hard layer which above the soft layer, but the main influence of the diffusion is in the thickness of this layer; the initial linear part of the load tests’curves do not truely express the compression of the composite subgrade for the raft foundation due to the effect of deepness.