大面积荷载作用下硬壳层地基沉降计算理论研究

Study on Settlement Calculation Theory of Hard Shell Foundation under Large Area Loading

随着建筑业的蓬勃发展,环境美化越来越受到人们的重视,堆坡造山、园林庭院的设计也越来越多,大面积堆载工程已经成为一种比较普遍的工程。这些工程规模较大,大面积荷载不同于常规荷载,它对地基变形的影响深度较大,并且存在着严重的工后沉降问题。目前常用的地基沉降计算大多并未考虑到非均质地基中(如上覆硬壳层地基)土性参数随深度变化的特性,这与大面积荷载作用下硬壳层地基变形的实际情况存在明显的差异。针对这个问题,基于广义Gibson地基模型,提出了一种新的土体模量随深度非线性减小的非均质弹性地基模型,推导出大面积荷载作用下硬壳层地基的附加应力以及沉降计算公式,为以后指导类似工程中的沉降计算提供理论基础。

With the vigorous development of the construction industry,people pay more attention to environmental beautification,and there are more and more design of hillside and garden yard.Large-area surcharge engineering has become a more common project.These projects are large-scale,large-area loads are different from conventional loads,which have a greater impact on foundation deformation,and there are serious post-construction settlement problems.At present,most of the commonly used foundation settlement calculations do not take into account the characteristics of soil parameters varying with depth in heterogeneous foundation(such as overlying hard-shell foundation),which is obviously different from the actual situation of deformation of hard-shell foundation under large-area load.In order to solve this problem,based on the generalized Gibson foundation model,a new inhomogeneous elastic foundation model is proposed,in which the modulus of soil decreases nonlinearly with depth.Additional stress and settlement calculation formula of hard shell foundation under large area load are derived,which provides a theoretical basis for guiding settlement calculation in similar projects in the future.