考虑非极限状态土压力的水泥土搅拌桩围护结构水平变形计算方法  

Calculation method of horizontal deformation of cement-mixing-pile retaining structure considering the earth pressure in non-limit state

作　　者：韩业龙[1,2] 郑刚[1,2] 刁钰[1,2] 聂东清 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]滨海土木工程结构与安全教育部重点实验室,天津300072

出　　处：《建筑结构》2013年第S2期641-646,共6页Building Structure

基　　金：国家重点基础研究发展计划(973计划)项目(2010CB732106);国家科技支撑计划项目(2012BAJ01B02);国家自然科学基金资目(51308389)

摘　　要：目前工程设计中计算土压力时一般采用朗肯或库仑土压力理论,这两种理论属于极限状态理论,而土体在实际工作状态下位移很小,土压力往往不能达到主动或被动极限状态,即一般处于非极限状态。根据基坑支护变形特征,选取似指数函数计算土压力,可考虑土压力与支护位移之间的关系;进而,基于能量法,建立了考虑非极限状态土压力的水泥土搅拌桩围护结构水平变形的计算方法;最后将计算结果与工程案例实测进行了对比验证。分析结果表明,考虑非极限状态土压力的计算方法具有较好的准确度。In the current design method,the Rankine's or Coulomb's earth pressure theory is generally used to calculate the earth pressure.Both of the two theories are based on the limit state of soil.However,since the soil usually has small displacement in working state,neither of the active nor passive earth pressure could be reached.In other word,the soil is actually in non-limit state.According to the deformation characteristics of retaining structure,the quasi-exponential model was adopted to obtain the earth pressure in non-limit state,which is related to the displacement of retaining structure.Then,based on the energy method,the calculation method for the horizontal deformation of the cement-mixing-pile as retaining structure was established.The calculated results were verified by comparison with the measure results of case histories.It is found that the method considering the earth pressure in non-limit state has a high accuracy and practicability.

关 键 词：土压力 非极限状态 能量法 围护结构 水平变形 

分 类 号：TU473.1[建筑科学—结构工程]