水泥加固海相软土的特征强度  

Characteristic strength of cement-treated marine clay

作　　者：李福豪[1] LEE Fookhou(Department of Civil&Environmental Engineering,National University of Singapore,Singapore 117576,Singapore)

机构地区：[1]新加坡国立大学土木与环境工程系

出　　处：《隧道与地下工程灾害防治》2019年第3期9-13,共5页Hazard Control in Tunnelling and Underground Engineering

摘　　要：水泥加固土被广泛应用于海相软土的地基加固工程中。由于其显著的空间变异性与复杂的本构特性,水泥土的特征强度选取较为困难。欧洲规范认为,岩土参数特征值的选取应该考虑岩土工程结构的整体性能;若使用基于可靠度的设计方法,须保证以该特征值设计的岩土工程结构出现极限状态的可能性不大于5%。结合随机有限元分析,将点强度的统计特性与岩土工程结构整体性能直接联系起来,提出一种基于整体性能以及可靠度的分析方法,为水泥土特征值的选取提供一种思路。Cement-treated marine clay has been widely used in ground improvement.Due to its significant spatial varia-bility and complicated constitutive behaviour,the selection of characteristic strength of cemented soil is challenging.Ac-cording to Eurocode 7,the characteristic value should represent the overall performance of the geotechnical system.And when a reliability-based design method is adopted,“the characteristic value should be derived such that the calculated probability of a worse value governing the occurrence of the limit state under consideration is not greater than 5%”.In this paper,the random finite element analysis was proposed to directly link the spatial variation in the point strength and the overall performance of geotechnical system,which was more directly related to system performance and allowed the probability of failure to be estimated or prescribed for cement-treated soil.

关 键 词：水泥加固土 特征强度 空间变异性 随机有限元分析 

分 类 号：U454[建筑科学—桥梁与隧道工程]