强夯地基的变形及沉降计算方法研究

【作者】 王建华；

【导师】 李夕兵； 罗坚强；

【作者基本信息】 中南大学 ， 岩土工程， 2003， 硕士

【摘要】 在强夯设计时，设计者往往会碰到一个大难题，就是在试夯后如何评定或判断初步强夯设计方案能否满足建筑物对地基沉降的要求以及如何去更改和完善设计方案。由于夯后地基分层很不规律以及传统分散式检测结果没有很好的代表性，使得传统的沉降计算法不再适用于夯后地基的沉降计算，所以必须寻求一种新的沉降计算方法，本文将以此为目标来开展研究。 本文首先简要介绍了强夯法的机理，提出应用多目标模糊数学优选理论来评价和选择地基处理方案，并运用这种优选理论举例论证了强夯法相对于其它地基处理方法的优势，进一步说明了进行强夯地基沉降计算方法研究的意义所在。 夯后场地平均沉降量是强夯加固效果的一种评价指标，本文对目前的各种计算方法进行分类总结，评价了各种方法的优缺点并指出了各方法的适用范围。 文中指出并论证了夯后地基具有分层很不规律，密实度在空间上变化大等特点。指出分散式地基检测结果对各深度处的土层性质没有较好的代表性，在这种情况下运用传统的分层总和等沉降计算方法来计算地基沉降是很不科学的。提出将瑞雷波法与传统点式检测法相结合来求得各深度处土的平均性质指标，用积分计算代替传统的分层计算，得到一种更科学的夯后地基沉降量计算新方法。并根据工程实际的需要，探讨了夯后场地平均沉降量的计算。本方法同样适用于其它绝大多数地基特别是复杂地基的沉降计算。更多还原

【Abstract】 After the dynamic consolidation, it is very difficult for the designers to justify whether the primary design for dynamic consolidation can satisfy the allowable settlement or not and how it would be modified. Because the delamination of the foundation after dynamic consolidation is very irregular and the traditional sporadic testing results can’t characterize the foundation commendably, the traditional methods are no longer suitable for calculating the settlement after dynamic consolidation. Therefore a new method for calculating the settlement should be proposed.This paper introduces the dynamic consolidation mechanism, and brings forward some new opinions. It is proposed to apply the fuzzy optimization theory to evaluate and choose the plans of soil treatment. The predominance of dynamic consolidation relative to other plans of soil treatment is illustrated by applying this optimization theory. It also explains the significance of researching the method to calculate the settlement of the foundation after dynamic consolidation.The average ground settlement after dynamic consolidation is a consequential indication of dynamic consolidation effect. Many methods together with their applications are summed and evaluated.Two characters of the foundation after dynamic consolidation are discussed. There are irregular stratification phenomenon and uneven distribution of the soil layer. It indicates that traditional sporadic testing results can’t characterize each soil layer at different depth. It is no longer scientific to calculate the settlement by using the traditional methods, for example, stratified summation method. This paper puts forward uniting rayleigh wave technique with traditional sporadic tests to fix on the average character index at each depth and replacing traditional stratifying calculation with integral calculation. It is more scientific to calculate the settlement after dynamic consolidation. And it can apply to most foundations especially to the complex foundations.更多还原