大面积荷载下的沉降计算  

Calculation of Settlement Induced by Large-Scale Load

作　　者：介玉新[1] 贾志杰 徐明[1] 陈杰[1] 孙铁[3] 李晓茹[3] 

机构地区：[1]水沙科学与水利水电工程国家重点实验室(清华大学),北京100084 [2]招商局华建公路投资有限公司,北京100022 [3]建设综合勘察研究设计院有限公司,北京100007

出　　处：《土木工程与管理学报》2012年第3期38-42,共5页Journal of Civil Engineering and Management

基　　金：水利部公益性行业科研专项(201001027)

摘　　要：围海造陆、码头堆场、堆载预压等填方工程对应的都是大面积荷载问题,城市建设中建筑物荷载的累加效应也相当于大面积荷载。本文对大面积荷载的特点进行了评述,给出了大面积荷载较为严格的定义。考虑土的变形模量随深度的增加以及小应变下土的变形特点进行分析,解释了大面积荷载沉降影响深度远小于应力影响深度的原因。进一步,给出了一维固结微分方程的Crank-Nicolson差分解法,以及考虑蠕变的微分方程和计算方法。Engineering activities such as beach reclamation, ore stacking and preloading are related to large-scale load. It is the same with the buildings in cities, which also produces the load with large-scale. In this paper, the characteristics of large-scale load are discussed, and rigorous definition of large-scale load is addressed. Considering deformation modulus increasing with depth and the deformation characteristics of soil at small strain, the reason that the deformation influence depth is much smaller than stress influence depth for large-scale load is investigated. Furthermore, Crank-Nicolson difference scheme is presented to solve the 1-D consolidation equation, in which creep of the soil is also taken into account.

关 键 词：沉降 小应变 一维固结 差分法 蠕变 

分 类 号：TU433[建筑科学—岩土工程]