自钻式旁压仪测定黏性土原位水平应力和K_0值  

Initial Horizontal Stress and K_0 Using Self-boring Pressuremeter

作　　者：辛蕊[1,2] 赵瑞斌[1] 杨爱武[1] 卢力强[1] 陈凤飞[1] 

机构地区：[1]天津城市建设学院土木工程系天津市软土特性与工程环境重点实验室,天津300384 [2]河北省建筑科学研究院天津分院,天津300384

出　　处：《中国港湾建设》2011年第1期32-35,共4页China Harbour Engineering

基　　金：天津市科技创新专项资金项目(07FDZDSF02101-04);天津市科技发展计划科技攻关项目(06YESZSF04000)

摘　　要：根据剑桥自钻式旁压仪的工作原理,分别按确定原位水平应力的观察法、迭代法、拟合法对天津市滨海新区黏性土的旁压曲线进行分析,并剖析算得的初始压力P0的物理意义,提出以观察法为基础的相关公式,用以确定原位水平应力。将试验数据按相关公式、迭代法、拟合法得到的P0计算K0,并与经验公式进行对比,认为K0值与土性和分析方法的基本假设有关。分析结果表明,用观察法的相关公式确定原位水平应力及K0值是一种适用于工程实践的有效方法。According to the working principle of Cambridge self-boring pressuremeter,analyze the pressuremeter curve of Tianjin Binhai New Area by observation,iterative and fitting method.Discuss the physical meaning of P0,which determined by these methods,and put forward a interaction formula of observation method to determine in-situ horizontal stress.Using P0,which was obtained by correlation formula,iterative and fitting method from test data,K0 was calculated.Compared these data,it is consider that K0 related to difference of soil and the basic assumptions of analysis.It is shown that using the interaction formula of observation method to determine the in-situ horizontal stress and K0 value is an effective methods for project practice.

关 键 词：自钻式旁压试验 原位水平应力 静止侧压力系数 黏性土 

分 类 号：TU413.6[建筑科学—岩土工程]