摘要
4.2.2特徽点的应用 1) 点。表示外荷克服地基最初抗力迫使地基变形,从这点开始计算基础瞬时沉降量;计算地基强度如[R]、P<sub>a</sub>、P<sub>k</sub>、P<sub>b</sub>必须考虑内聚力C的作用。 2) 点a所对应的横座标P<sub>?</sub>是地基临塑承载力的取值,也是地耐力[R]的限值;所对应的竖座标S<sub>a</sub>是基础瞬时沉降S<sub>R</sub>的限值。 3) 点c所对应的横座标P<sub>k</sub>是地基极限承载力的取值,也是地耐力[R]取值的依据。 4) 点d所对应的P<sub>b</sub>是地基破坏荷载,用它校核地基临塑承载力P<sub>a</sub>的取值。
It is difficult to determine the load capacity of composite
foundation by P-S curve in a dead load test within the proportional limits. Starting from an analysis of the mechanism of the deformation of composite foundation under pressure, this paper puts forward the new concepts of compacting deformation, shearing-compacting deformation and shearing deformation, which, result in the calculative equation Of P-S curve and several related sub-equations. By these equations,the value of P-S curve and its mechanical index can be worked out and hence the loading bearing power and sedimentation rate. It is proved by some practical engineering data that the results calculated by the above-mentioned method are well close to those by trial tests. Based on the calculated mechanical index,a further analysis is made of the causes for the load bearing power of composite foundation being bigger than that of non-composite foundation,which will help give a greater role to the advantages of composite foundation and bring it into even wider use.
出处
《株洲工学院学报》
1994年第1期40-49,共10页
Journal of Zhuzhou Institute of Technology
关键词
复合地基
P-S曲线
力学性能
压缩模量
Composite foundation Reinforced pile Earth between piles Compacting deformation Compacted core Shearing deformation Shearing-compacting deformation Foundation resistance
