夯实水泥土桩复合地基桩土应力比影响因素分析

Influence factors analysis on pile-soil stress ratio of composite foundation with rammed soil-cement piles

桩土应力比是一个非常复杂的参数,影响因素很多,采用试验方法很难全面了解各种因素对其影响的规律.本文在夯实水泥土试块无侧限抗压强度试验的基础上,对影响夯实水泥土桩单桩复合地基桩土应力比的诸多因素进行了有限元分析,结果表明:桩土应力比随桩长、桩身弹性模量、垫层弹性模量以及桩端土的弹性模量的提高而提高,随桩径、桩周土的弹性模量、垫层厚度的增大而降低.此结果可以作为工程上对夯实水泥土桩复合地基进行优化设计以降低工程造价的依据.

Pile-soil stress ratio is a complicated parameter and may be influenced by many factors, so it is difficult to study all the influence factors with experiment method. Based on the unconfined compressive strength test, many important relevant factors are studied with finite element method in the paper. The results show that the value of pile-soil stress ratio increases with the increasing of pile length, pile body elastic modulus, cushion elastic modulus, elastic modulus of soil under pile bottom, and decrease with the pile diameter, elastic modulus of soil around the pile, thickness of cushion increasing. The results may be a reference in optimization designing of similar project.